Lg 42pg20 Training Manual

Advanced Single Scan Troubleshooting

Training Manual

42PG20 Plasma Display42PG20 Plasma Display

720p720p

Published Fall 2008Updated March 2009

PLASMA Fall 2008 42PG202

Overview of Topics to be Discussed

• UNIFIED Y and Z-SUS Board (Z-SUS Drive signals developed)

• Z-SUS Output Board (Receives Z-SUS signals from Y-SUS Board)• Y-Drive Boards (Receives Y-Drive signals from Y-SUS Board)

• Control Board (Outputs Y and Z control signals to Y-SUS Board)• X Drive Boards (2)

Circuit Board Operation, Troubleshooting and Alignment of :• Switch mode Power Supply

• Main Board

Section 1

Section 2

Contact Information, Preliminary Matters, Specifications,Plasma Overview, General Troubleshooting Steps, Disassembly Instructions, Voltage and Signal Distribution

OUTLINEOUTLINE

NEW

NEW

NEW


42PG20 Plasma Display

Section 1

This Section will cover Contact Information and remind the Technician of Important Safety Precautions for the Customers Safety as well as the Technician and the Equipment.

Basic Troubleshooting Techniques which can save time and money sometimes can be overlooked. These techniques will also be presented.

This Section will get the Technician familiar with the Disassembly, Identification and Layout of the Plasma Display Panel.

At the end of this Section the Technician should be able to Identify the Circuit Boards and have the ability and knowledge necessary to safely remove and replace any Circuit Board or Assembly.

Overview of Topics to be DiscussedOverview of Topics to be Discussed


IMPORTANT SAFETY NOTICEIMPORTANT SAFETY NOTICE

The information in this training manual is intended for use by persons possessing an adequate background in electrical equipment, electronic devices, and mechanical systems. In any attempt to repair a major Product, personal injury and property damage can result. The manufacturer or seller maintains no liability for the interpretation of this information, nor can it assume any liability in conjunction with its use. When servicing this product, under no circumstances should the original design be modified or altered without permission from LG Electronics. Unauthorized modifications will not only void the warranty, but may lead to property damage or user injury. If wires, screws, clips, straps, nuts, or washers used to complete a ground path are removed for service, they must be returned to their original positions and properly fastened.

CAUTIONCAUTION

To avoid personal injury, disconnect the power before servicing this product. If electrical power is required for diagnosis or test purposes, disconnect the power immediately after performing the necessary checks. Also be aware that many household products present a weight hazard. At least two people should be involved in the installation or servicing of such devices. Failure to consider the weight of an product could result in physical injury.

Preliminary Matters (The Fine Print)Preliminary Matters (The Fine Print)


Today’s sophisticated electronics are electrostatic discharge (ESD) sensitive. ESD can weaken or damage the electronics in a manner that renders them inoperative or reduces the time until their next failure. Connect an ESD wrist strap to a ground connection point or unpainted metal in the product. Alternatively, you can touch your finger repeatedly to a ground connection point or unpainted metal in the product. Before removing a replacement part from its package, touch the anti-static bag to a ground connection point or unpainted metal in the product. Handle the electronic control assembly by its edges only. When repackaging a failed electronic control assembly in an anti-static bag, observe these same precautions.

Regulatory InformationRegulatory Information

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a residential installation. This equipment generates, uses, and can radiate radio frequency energy, and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: Reorient or relocate the receiving antenna; Increase the separation between the equipment and the receiver; Connect the equipment to an outlet on a different circuit than that to which the receiver is connected; or consult the dealer or an experienced radio/TV technician for help.

ESD NoticeESD Notice (Electrostatic Static Discharge)(Electrostatic Static Discharge)


Contact InformationContact Information

Also available on the Also available on the Plasma pagePlasma page

New Training Materials on New Training Materials on the Learning Academy sitethe Learning Academy site

Customer Service (and Part Sales) (800) 243-0000

Technical Support (and Part Sales) (800) 847-7597

USA Website (GSFS) http://gsfs-america.lge.com

Customer Service Website us.lgservice.com

LG Web Training lge.webex.com

LG CS Academy lgcsacademy.com

LG Electronics Alabama, Inc. 201 James Record Road, Huntsville,

AL, 35813.

http://136.166.4.200

Published Fall 2008 by LG Technical Support and Training

32LG40, 32LH30, 37LH55, 42LG60, 42LG70, 42LH20, 42LH40, 42LH50, 42LH90, 42SL80, 47LG90, 47LH85 42PG20, 42PQ20, 42PQ30, 50PG20, 50PS80, 50PS60, 60PS11

LCD-DV:

PLASMA:

Plasma PanelAlignment Handbook

Presentations with Audio/Video and Screen Marks


Safety & Handling Regulations

1. Check the appearance of the Replacement Panel and Circuit Boards for both physical damage and part number accuracy.

2. Check the model label. Verify model names and board model matches.

3. Check details of defective condition and history. Example: Y Board Failure, Mal-discharge on screen, etc.

1. Approximately 10 minute pre-run time is required before any adjustments are performed.

2. Refer to the Voltage Sticker inside the Panel when making adjustments on the Power Supply, Y-SUS and Z-SUS Boards.

Always adjust to the specified voltage level (+/- ½ volt).

3. Be cautious of electric shock from the PDP module since the PDP module uses high voltage, check that the Power Supply

and Drive Circuits are completely discharged because of residual current stored before Circuit Board removal.

4. C-MOS circuits are used extensively for processing the Drive Signals and should be protected from static electricity.

5. The PDP Module must be carried by two people. Always carry vertical NOT horizontal.

6. The Plasma television should be transported vertical NOT horizontal.

7. Exercise care when making voltage and waveform checks to prevent costly short circuits from damaging the unit.

8. Be cautious of lost screws and other metal objects to prevent a possible short in the circuitry.

9. New Panels and Frames are much thinner than previous models. Be Careful with flexing these panels. Be careful with lifting Panels from a horizontal position. Damage to the Frame mounts or panel can occur.

Checking Points to be Considered

Plasma OverviewPlasma OverviewPrevious models glass thickness was 2.8mm

This unit 1.8mm thickness


Basic Troubleshooting StepsBasic Troubleshooting Steps

Define, Localize, Isolate and Correct

•Define Look at the symptom carefully and determine what circuits could be causing the failure. Use your senses Sight, Smell, Touch and Hearing. Look for burned parts and check for possible overheated components. Capacitors will sometimes leak dielectric material and give off a distinct odor. Frequency of power supplies will change with the load, or listen for relay closing etc. Observation of the front Power LED may give some clues.

•Localize After carefully checking the symptom and determining the circuits to be checked and after giving a thorough examination using your senses the first check should always be the DC Supply Voltages to those circuits under test. Always confirm the supplies are not only the proper level but be sure they are noise free. If the supplies are missing check the resistance for possible short circuits.

•Isolate To further isolate the failure, check for the proper waveforms with the Oscilloscope to make a final determination of the failure. Look for correct Amplitude Phasing and Timing of the signals also check for the proper Duty Cycle of the signals. Sometimes “glitches” or “road bumps” will be an indication of an imminent failure.

•Correct The final step is to correct the problem. Be careful of ESD and make sure to check the DC Supplies for proper levels. Make all necessary adjustments and lastly always perform a Safety AC Leakage Test before returning the product back to the Customer.


This section of the manual will discuss the specifications of the 42PG20 Advanced Single Scan Plasma Display Panel.

42PG20 PRODUCT INFORMATION SECTION42PG20 PRODUCT INFORMATION SECTION


42PG20 Specifications42PG20 Specifications

• 720p HD Resolution • Dual XD Engine™• 20,000:1 Contrast Ratio • Fluid Motion • 3x HDMI™ V.1.3 with Deep Color • AV Mode (Cinema, Sports, Game) • Clear Voice • LG SimpLink™ Connectivity • Invisible Speaker System • 100,000 Hours to Half Brightness (Typical) • PC Input

720P PLASMA HDTV42” Class (41.5” diagonal)


Grid to Pixel to Resolution RelationshipGrid to Pixel to Resolution Relationship

Y-Drive“Buffers”

Horizontal Grids

Z-SUS

Horizontal Grids are on “Front” of the Cells as viewed from the front.

Layout below as viewed from the rear.

Where the 3 Grids Intersect is a single Colored Cell

Red, Green and BlueCells make a “Pixel”

Green

Blue

Vertical Grids are in “Back” of the Cells as viewed from the front.

X-BoardsSame as (A-BUS)Initialize the Cell

Deliver Color information

Y-SUSCell Clean up (Y-Drive Edge)

Deliver Luminance Fire Firing the Cell via Wall Charge

Line by Line

Z-SUSFiring the Cell via Wall Charge

All Lines fire at once

Horizontal GridsDetermine Vertical Resolution

Vertical GridsDetermine Horizontal

ResolutionR

edX-Boards“TCPs”

Vertical Grids


HD RESOLUTION 720p HD Resolution Pixels: 1024 (H) × 768 (V)High definition television is the highest performance segment of the DTV system used in the US. It’s a wide screen, high-resolution video image, coupled with multi-channel, compact-disc quality sound.

Logo Familiarization (1 of 4)Logo Familiarization (1 of 4)

FORMATS480I480P1080I720P1080P

InterlacedProgressiveInterlacedProgressiveProgressive

Interlaced2 Fields to make a Frame

ProgressiveEach Field is a Frame

Think of sync as the Panels “Refresh Rate”

240 Lines480 Lines540 Lines720 Lines1080 Lines

NTSCSDHDHDHD

BASICPIXEL COUNTS

PLASMA1365 (H) × 768 (V)

LCD DV1920 (H) x 1080 (V)

Possible FrameRates:24FPS30FPS60FPS

768720P Panel720P Logo



HD RESOLUTION 720p HD Resolution Pixels: 1024 (H) × 768 (V)High definition television is the highest performance segment of the DTV system used in the US. It’s a wide screen, high-resolution video image, coupled with multi-channel, compact-disc quality sound.

HDMI (1.3 Deep Color) Digital multi-connectivity HDMI (1.3 Deep color) provides a wider bandwidth (340MHz, 10.2Gbps) than that of HDMI 1.2, delivering a broader range of colors, and also drastically improves the data-transmission speed.

Dual XD EngineRealizing optimal quality for all imagesOne XD Engine optimizes the images from RF signals as another XDEngine optimizes them from External inputs. Dual XD Engine presents images with optimal quality two times higher than those of previous models.

LG SIMPLINK™ MULTI-DEVICE CONTROL Allows for convenient control of other LG SimpLink products using the existing HDMI connection.



AV Mode "One click" - Cinema, Sports, Game mode.TAKE IT TO THE EDGE is a true multimedia TV with an AV Mode which allows you to choose from 3 different modes of Movies, Video Games and Sports by a single click of a remote control.

Clear Voice Clearer dialogue sound Automatically enhances and amplifies the sound of the human voice frequency range to provide high-quality dialogue when background noise swells.

Save Energy, Save MoneyHome electronic products use energy when they're off to powerfeatures like clock displays and remote controls. Those that haveearned the ENERGY STAR use as much as 60% less energy toperform these functions, while providing the same performance at thesame price as less-efficient models. Less energy means you pay lesson your energy bill. Draws less than 1 Watt in stand by.



Tru-Surround is a sound-scheme that has the ability to take multi-channel encoded sources, such as Dolby Digital, and reproduce the multi-channel surround effect by just using two-speakers. The result is not as impressive as true Dolby Digital 5.1 (the front and side surround effects are impressive, but the rear surround effects fall a little short, with the sense they are coming from just to rear of your head rather than from the back of the room).

Dolby® DigitalIn thousands of cinemas and millions of homes worldwide, Dolby Digital is the reigning standard for surround sound technology in general and 5.1-channel surround sound in particular.

FluidMotion (180 Hz Effect)

Invisible SpeakerPersonally tuned by Mr. Mark Levinson for LG TAKE IT TO THE EDGE newly introduces ‘Invisible Speaker’ system, guaranteeing first class audio quality personally tuned by Mr. Mark Levinson, world renowned as an audio authority. It provides Full Sweet Spot and realistic sound equal to that of theaters with its Invisible Speaker.

Enjoy smoother, clearer motion with all types of programming such as sports and action movies. The moving picture resolution give the impression of performance of up to 3x the panels actual refresh rate.


PDP180Hz

LCD60Hz

Moving Picture Response Time is 16.5 milliseconds

(120Hz takes MPRT to 8.25ms)

Panel Response Time is 4 to 8 milliseconds

Moving Picture Response Time is 5.44 milliseconds

Panel Response Time is less than 1 millisecond

FluidMotion (180 Hz Effect)Enjoy smoother, clearer motion with all types of programming such as sports and action movies. The moving picture resolution give the impression of performance of up to 3x the panels actual refresh rate.

42PG20 Specifications FluidMotion Familiarization42PG20 Specifications FluidMotion Familiarization


42PG20 Remote Control42PG20 Remote Control

TOP PORTION

BOTTOM PORTION


Rear Input JacksRear Input Jacks

15.8"400mm

26.7"678.2mm

6.2"158mm

40.9"1038.9mm

28.8"731.5mm

28.8"731.5mm

3.4"86.4mm

12.1"307.3mm

Center

15.8"400mm

6.6"168.78mm

1.93"49mm

Remove 4 screws to remove stand for

wall mount

Model No.Serial No.

Label

15.55"394.95mm

12.4"315mm

4.72"120mm

17.48"443.95mm

Weight without Stand: 53.7 lbWeight with Stand: 60.2 lb

19

42PG20 Product Dimensions42PG20 Product Dimensions


This section of the manual will discuss Disassembly, Layout and Circuit Board Identification, of the 42PG20 Advanced Single Scan Plasma Display Panel.

Upon completion of this section the Technician will have a betterunderstanding of the disassembly procedures, the layout of the printedcircuit boards and be able to identify each board.

DISASSEMBLY SECTIONDISASSEMBLY SECTION


Removing the Back CoverRemoving the Back Cover

To remove the back cover, remove the 26 screws(The Stand does not need to be removed).

Indicated by the arrows.

PAY CLOSE ATTENTION TO THE TYPE, SIZE AND LENGTHOf the screws when replacing the back cover. Improper type can

damage the front.


Circuit Board LayoutCircuit Board Layout

Y-SUS & Z-SUS DriveZ-SUS

Right “X”Left “X”

Main “Digital”

FPC

Control “Logic”

Power Supply

FPC

FPC

FPC

FPC

FPC

Panel ID LabelPanel Voltage Label

SideInput(part

ofmain)

Y-Drive

Control Keys

PowerButton

Invisible Speakers

TCPHeat Sink

Z drive from Y-SUS


Switch Mode Power Supply Board Removal

Disconnect the following Connectors: P812, P813, CN101Remove the 8 screws holding the Board in placeRemove the BoardWhen replacing, be sure to readjust the Va/Vs voltages in accordance with the Panel Label.Confirm VSC, -Vy and Zbias as well.

Y-SUS Board Removal

Y-Drive Board Removal

Notes: 1) All Plugs listed are from left to right Pin 1,2, 3, ETC.2) Remember to be cautious of ESD as some semiconductors are CMOS and prone to static failure

Disassembly Procedure for Circuit Board RemovalDisassembly Procedure for Circuit Board Removal

Disconnect the following Connectors: P201, P801, P101, P202Remove the 8 screws holding the Board in placeRemove the BoardWhen replacing, be sure to readjust the Va/Vs voltages in accordance with the Panel Label.Confirm VSC, -Vy and Zbias as well.

Disconnect the following Flexible Ribbon Connectors: P1, P2, P3, P4, P5, P6, P7 and P8Disconnect the following Connectors: P201, P801, P101, P202Remove the 3 screws holding the Board in placeRemove the Board by lifting slightly and sliding the Board to the left unseating P204 and P200 from the Y-SUS Board


Z-SUS Board Removal

Main Board Removal

Control Board Removal

Disassembly Procedure for Circuit Board Removal (2)Disassembly Procedure for Circuit Board Removal (2)

Remove the support frame holding the Main BoardDisconnect the following Connector: P1Remove the 3 screws holding the Board in place and Disconnect the following Connectors: P2 and P3Remove the Board.When replacing, be sure to readjust the Va/Vs voltages in accordance with the Panel Label.Confirm VS, -Vy and Zbias as well.

Disconnect the following Connectors: P701, P302, P303 and JK501Remove the 2 screws holding on the decorative plastic piece on the right sideRemove the 4 screws holding the Board in place and Remove the Board.

Disconnect the following Connectors: P121, P160, P161 and P162Remove the 4 screws holding the Board in place Remove the Board.

X-Drive Boards RemovalDisconnect the following Connectors: P232, P211, P311 and P331Remove the 13 screws holding the Heat Sink in placeDisconnect the following Connectors: P201 through P206 and P301 through P306Remove the 4 screws holding each of the X Drive Boards in place (8 total)Remove the Boards.

Disconnect the single Connector P101. Remove the 2 screws holding the Board in place Remove the Board. (Note: Power Board is behind the Control Board. Remove it’s 2 screws and remove.

Control Button Board Removal


X Board Removal (continued)

Lay the Plasma down carefully on a padded surface.Make sure AC is removed and remove the Back Cover and the Stand.Carefully remove the LVDS Cable P121 from the Control Board by pressing the Locking Tabs together and Pull the Connector straight back to remove the cable see illustration below. (This prevents damage).

(A) Remove the Stand mounting support plastic piece. (B) Remove the Stand Metal Support Bracket, unplug AC ground lug. (C) Remove the 2 screws from the decorative black plastic piece around side input jacks (Marked B) and remove. (D) Remove the 2 screws at the top of the Main Board Mounting Bracket and peel the tape from the bottom. Remove

Connector P303 and JK501. Carefully reposition the Main Board and Mounting Bracket up and off to the right side. (E) Remove the metal support Brackets marked “E”.(F) Remove the 13 screws holding the Heat Sink and carefully lift it straight up and off (remember that the TCP IC’s are

located under the HEAT SINK ).

X-DRIVE Boards REMOVAL:Disconnect all TCP ribbon cables from the defective X-Drive Board. Remove the 5 screws holding the Board in place.Remove the Board. Reassemble in reverse order. Recheck Va/Vs/VScan/-VY/Z-Drive.

X Circuit Board Removal ContinuedX Circuit Board Removal Continued

Press Inward

Press Inward

LVDS Cable Connector


X Board Removal

X Board Removal will require the most disassembly of all the boards. All the Brackets and Assemblies marked with “A~F” will need to be removed this includes the Stand. Before an X Board can be removed the Heat Sink Assembly “F” must be removed.

X Circuit Board RemovalX Circuit Board Removal

Y and Z-SUS DriveZ-SUS

E

Right “X”Left “X”

Main “Digital”

Control “Logic”

Power Supply

Y-Drive

E

B

F

D

C

A


Left and Right X Drive RemovalLeft and Right X Drive Removal

Showing the tape on the Connectors P232 or P331

Peel the tape off the Connectors

Gently pry the locking mechanism upward

Gently lift the locking mechanism upward on all TCP Connectors P201~206 or P301~306

Carefully lift the TCP ribbon up and off the cushion and out of the way.

TCPFlexible ribbon

cable

After removing the back cover, Main Board is lifted out of the way, 15 screws removed from heat sink covering TCPs and heat sink removed, the X-Drive Boards can be removed.

Cushion


TCP (Tape Carrier Package) PrecautionsTCP (Tape Carrier Package) Precautions

TCP Connector Removal

Lift up the lock as shown by arrows.(The Lock can be easily broken.It needs to be handled carefully.)

Pull TCP apart as shown by arrow.(TCP Film can be easily damaged.Handle with care.)


Left and Right X Drive RemovalLeft and Right X Drive Removal

Remove the 5 screws for either Board or 9 total for both. (The Center screw secures both Boards)

Right X Board drive the left side of the screen

Left X Board drives the right side of the screen

Display PanelHorizontal Address

P100

5V

FloatingGround

NEW

Y-SUSPWB

With Z-DriveP204

P201

P801

P211

P101

P202

Drive DataClock (i2c)

P200

M5V, Va, Vs

P812

P813CN101

STB +5V, 16V

SMPSTurn On

Commands

SMPSPWB

ACInputFilter

NEW

P1

SMPS OUTPUT VOLTAGES

Set Off: STB +5V, 16V

Z-SUSDrive Signals

Logic SignalsP160

AC Voltage Det

P701

P302

P303JK501

MAINPWB

Speakers

ControlKeys

PowerKeys

X-PWB-RightX-PWB-Left

P201 P202 P203 P204 P205 P206 P301 P302 P303 P304 P305 P306

RGB Logic Signals

15V, Va

RGB Logic Signals

3.3V

CONTROLPWB

P162

LVDS

Y Drive PW

B

Z SU

S PW

B

P161

P121

P1P2

P3

P4P

5P6

P7P

8

P2P

3

Out

puts

Onl

y

P232 P211 P311 P331

Display Panel Vertical Address

IR

Vs

Display PanelHorizontal Address

5V Relay OnM5 OnVS On

Set On: 16V

30

42PG20 Voltage and Signal Distribution Block Diagram42PG20 Voltage and Signal Distribution Block Diagram


42PG20 Plasma Display

This Section will cover Circuit Operation, Troubleshooting and Alignment of the Power Supply, Y-SUS Board, Y-Drive Boards, Z-SUS Board, Control Board, Main Board and the X Drive Boards.

At the end of this Section the technician should understand the operation of each circuit board and how to adjust the controls. The technician should be able with confidence to troubleshoot a circuit board failure, replace the defective circuit and perform all necessary adjustments.

CIRCUIT OPERATION, TROUBLESHOOTING AND CIRCUIT CIRCUIT OPERATION, TROUBLESHOOTING AND CIRCUIT ALIGNMENT SECTIONALIGNMENT SECTION

Remember, the Z-SUS Drive section is now located on the Y-SUS Board.But it will be described separately.


(1) Model Name(2) Bar Code(3) Manufacture No.(4) Adjusting Voltage DC, Va, Vs(5) Adjusting Voltage (Set Up / -Vy / Vsc / Ve / Vzb)(6) Trade name of LG Electronics(7) Manufactured date (Year & Month)(8) Warning

Panel Label ExplanationPanel Label Explanation

(9) TUV Approval Mark(10) UL Approval Mark(11) UL Approval No.(12) Model Name(13) Max. Watt (Full White)(14) Max. Volts(15) Max. Amps


ADJUSTMENT ORDER “IMPORTANT”DC VOLTAGE ADJUSTMENTS1) SMPS Board: Vs Va (Always do SMPS first)2) Y-SUS Board: Adjust –Vy, Vscan, 3) Z-SUS Board: Adjust ZbiasWAVEFORM ADJUSTMENTS1) Y-SUS Board: Ramp Up, Ramp Down

Adjustment NoticeAdjustment Notice

It is critical that the DC Voltage adjustments be checked when ever;1) SMPS, Y-SUS or Z-SUS Board is replaced.2) Panel is replaced, since the SMPS does not come with new panel3) A Picture issue is encountered4) As a general rule of thumb when ever the back is removed

Remember, the Voltage Label MUST be followed, it is specific to the panel’s needs.

All label references are from a specific panel. They are not the same for every panel encountered.

-VY Z_BIAS

Panel“Rear View”

ManufacturerBar Code

Set-Up

VeVscanThe Waveform adjustment is only necessary1) When the Y-SUS Board is replaced2) When a “Mal-Discharge” problem is encountered3) When an abnormal picture issues is encountered

When ever a new Board is received from parts,CENTER ALL ADJUSTMENT POTS before installing the Board.

Example: If Ramp Up on the Y-SUS is too high, the set will shut down.


• DC Voltages developed on the SMPS• Adjustments VA and VS.

• Always refer to the Voltage Sticker located on the back of the panel, in the upper Left Hand side for the correct voltage levels for the VA, VS, -VY, Vscan, and Z Bias as these voltages will vary from Panel to Panel even in the same size category.

• Set-Up and Ve are just for Label location identification and are not used with this panel.

-VY Vscan Z_BIAS

42PG20

SWITCH MODE POWER SUPPLY SECTIONSWITCH MODE POWER SUPPLY SECTION

This Section of the Presentation will cover troubleshooting the Switch Mode Power Supply for the Single Scan Plasma. Upon completion of the section the technician will have a better understanding of the operation of the Power Supply Circuit and will be able to locate voltage and test points needed for troubleshooting and alignments.

Panel“Rear View”

ManufacturerBar Code

Set-Up

Ve


42PG20

SMPS P/N EAY43533901

Check the sticker on the upper left side to confirm origin of the Panel or the White Label on the Power Supply itself to identify the Board P/N.

We will examine the Operation of the EAY43533901.

Switch Mode Power Supply Part NumberSwitch Mode Power Supply Part Number


3

5

7

9

11

13

15

17

19

21

Gnd

0V

Gnd

5V

5V

Gnd

Gnd

5_V Det

RL_ON

M5V_ON

2

4

6

8

10

12

14

16

18

20

22

16.5V

Gnd

0V

Gnd

5V

5V

Gnd

Gnd

AC Det

VS_ON

Gnd

1 16.5V

Power Supply Board LayoutPower Supply Board Layout1

2

3

4

5

67

8

9

10

Vs

Vs

n/c

GND

GND

Va

Va

GND

M5V

M5V

P812

P813

Hot Ground Symbol represents a SHOCK Hazard


The Switch Mode Power Supply Board Outputs to the :

VAY-SUS Board

Main Board

VS

M5V VCC

Primarily responsible for Display Panel Vertical Grid

Drives the Display Panel Horizontal Grid

Used to develop Bias Voltages on the Y-SUS,X Drive, and Control Boards

16V Audio B+ Supply

5V Signal Processing Circuits

Adjustments

There are 2 adjustments located on the Power Supply Board VA and VS. The 5V VCC is pre-adjusted and fixed. All adjustments are made with relation to Chassis Ground. Use “Full White Raster” 100 IRE

VA

VS

RV901

RV951

Switch Mode Power Supply OverviewSwitch Mode Power Supply Overview


Main FuseF101

VS VR951

AC InputCN 101

P812

380VSource

AC Input

VS Source

VA SourceStandbySource

16v, 5vSource

IC701Sub Micon

VA VR901

P813

10Amp/230V

Switch Mode Power Supply Circuit LayoutSwitch Mode Power Supply Circuit Layout

PFCCircuit

340V FuseF801

10Amp/230V

To Y-Z-SUS

To MAIN


Power Supply Operation and Troubleshooting

AC Voltage is supplied to the SMPS Board at Connector CN101 from the AC Input Filter. Standby 5V is developedfrom 340V source supply (which during standby measures 159V hot ground). This supply is also used to generate all other voltages on the SMPS.

The 5V (standby) voltage is routed to the Sub Micon circuit (IC701) on the SMPS and through P813 to the Main Board for Micon (IC100) operation. LD703 will glow green to indicate STBY 5V has arrived.AC detect Pin 18, P813 is generated on the SMPS by monitoring the AC input and rectifying a small sample voltage. This AC Detect Voltage is routed to (IC701) the Sub Micon on the SMPS and the Micon (IC100) located on the Main Board and is used as a basic “SMPS OK” signal.

When the Micon (IC100) on the Main Board receives an “ ON “ Command from either the Keyboard or the Remote IR Signal it outputs a high to RL-ON. This signal first turns on a DC level shifter Q706 which creates 5V General. LD703 now glows amber indicating 5V General has been generated. This 5V General now provides the pull up voltages when supply the output circuits to the SMPS. The RL-ON enters the SMPS Board at Pin 19 of P813. The RL-ON Voltage is sensed by the Sub Micon (IC701) circuit which causes the Relay Y-Drive Circuit to close Relay RL101 bringing the PFC source up to full power by increasing the 159V standby to 340V. At this time the 16V source becomes active and sent to the Main Board via P813.

The next step is for the Micon (IC105) on the Main Board to output a high on M5V_ON Line to the SMPS at P813 Pin 21which is sensed by the Sub Micon IC (IC701) on the SMPS turning on the 5V VCC line.

The last step to bring the supply to “Full Power” occurs when the Micon (IC100) on the Main Board brings the VS-ON line high at Pin 20 of P813 on the SMPS Board which when sensed by the Sub Micon IC (IC701) turns on the VA and VS Supplies (VA is brought high before VS).

Power Supply Basic OperationPower Supply Basic Operation


Understanding the Power On Sequence when Troubleshooting a possible Power Supply Failure will simplify the process of isolating which circuit board failed to operate properly. In this Section we will investigate the Power on Sequence and examine ways to locate quickly where the failure occurred.

Check the Power On LED for Operation. A Red LED indicates a presence of 5V STB and AC-ON/DETECT.Failure of the Power ON LED to light is an indication of loss of 5V STB or AC ON/ Detect remember the 5V STBand AC-ON/DETECT are developed on the SMPS and sent to the Main Board. Check LD703 for Green glow.

When Power is pressed, look for LD703 to change to Amber. Listen for Relay Click, the click of the Relay is an indication of RL-ON going high. RL-ON is sent from the Main Board to the SMPS and when present the IC701 controls the Relay Operation. RL-ON going High and no Relay is a failure of the SMPS, RL-ON staying low is a failure of the Main Board.

Relay Operation means that the SMPS if working properly will output the 16V Supply to the Main Board.This voltage will allow the Tuner, Audio and Video Circuits on the Main Board to function, and if connected to anAntenna Input, Audio would be present. If the Relays closed and these supplies failed suspect a problem with the SMPS.

The next step of operation calls for the M5V_ON line from the Main Board to the SMPS to go high on P813 pin 21. A high on the M5V_ON Line activates the 5V VCC line. Loss of 5V VCC results in no “Raster”, no Display Panel Reset, no Y, Z, Control or X Board operation. Loss of 5V VCC and M5V_ON going high could be caused by any of these boards or failure of the SMPS. M5V_ON staying low indicates a problem on the Main Board.

Remember if a voltage is missing check for proper resistance before proceeding

VS-ON is the last step of the Power Sequence and is responsible for bringing the VS and VA Voltages up. The VS-ON signal pin 20 P813 is sent from the Main Board to the SMPS as a high, VS and VA and full operation of theDisplay Panel are now enabled. Loss of VS-ON results in loss of VA and VS and no Raster, no Panel Display Reset but Audio would be present. If VS-ON went high and VS and VA where missing the problem could be causedby a failure on the SMPS or a circuit using these voltages. A Resistance check should narrow the possiblefailures quickly.

Power Supply Generic Troubleshooting TipsPower Supply Generic Troubleshooting Tips

M5V (DC Voltage)To Y-SUS, then to

Control PWB.

Vs/Va (DC Voltage)

To Y-SUS, Z-SUSVa routed to X-PWBs

AC In

Stand By 5V

Power Button

RemoteOr Key

AC Det.

ResetsMain Board

Turns on Green LED

Relay On

Relay On

SignalProcessing

M5V On

Vs On

Microprocessor or

BCM

M5V Reg

Vs Reg

Va Reg

12V/16V Regulators

5V Det.

5V Reg

StandBy 5V Reg

1

23 55 6 7 9

8

10

2

5

4

Both LEDs OnLooks Amber

At point TV is in Stand-By state. Energy Star compliant.Less than 1 Watt

5

5 9

7In Stand-By

Primary side is 90V

In Run (Relay On) Primary side is

370V

3

Turns on Red LED

3

12V

AC Det.

7

9

41

42PG20 Start Up Sequence Block Diagram42PG20 Start Up Sequence Block Diagram

42PG20 Power Supply Controls from Micro Side

R1045

R184

AC-DET

IO11A

2 1Y

143.3V

128

P701

R727

R717

R723R718

R715

R763

RL-ON

R1265V-MNT 17 5V-DET

R722R720

R142 R141

C142C143

68010K

SW100

Vcc

R135

+5V-General

C713

Q703

C701

IC101

D100

IC104

254

255

X10012Mhz

Vcc

9 10 11 12+5V-ST

Level Shifter

LD703Set Off +5VST Red

Set On 5VGen Amber

22

Gnd

Q706+5V-General 46

5RL-ON

LD7031.8V1.6V

IC100

RedGreen

32

R137 R6070

0Ω33Ω

R764VS-On

R13620167

33Ω

M5V-On21

RL-On19

AC-Det18

80

115

VS-On

M5V-On 166

RL-On 76

42

42PG20 Power Supply Controls (Microprocessor Side) 42PG20 Power Supply Controls (Microprocessor Side)

AC-Det

Reset

42PG20 Power Supply Controls from Micro Side 1st STEP

115INT

R184AC-DET

AC-DET

IO11A2 1Y

143.3V

128HW-RESET

P701

18R727

AC-DET

R142 R141

C142C143

68010K

SW100

Vcc

R135

C713

IC101

D100

IC104

254

255

X10012Mhz

Vcc

9 10 11 12

Gnd

22

IC100

+5V-ST

RL-ON

LD703

1.8V

Red

5V-SBY Arrives from SMPS

AC-DET Arrives from SMPSMicro Receives Vcc

AC-DET createsMicro Reset

Oscillator starts

LED703 receives 5VST and glows Red

AB

B

A

A

D

A

CSW 100 Manual Micro. Reset

AC-DET isMonitored

by uP

43

42PG20 Power Supply Controls (Microprocessor Side) Stand-By42PG20 Power Supply Controls (Microprocessor Side) Stand-By

ReceivesPower On CommandFrom Side Keys or

Remote

42PG20 Power Supply Controls from Micro Side 2nd STEP

P701

118

9 10 11 12+5V-STQ706Level Shifter

46

LD7031.8V1.6V

Red

5

119

KEY CONTROLS

IC100Micro

114 REMOTEIR In

R764VS-On

76Pull-Up

R1265V-MNT 17 5V-DET

R722R720

R13620

+5V-General

C701

Green

Appears Amber

R137M5V-On

R607021

0ΩM5V-On

76R1045

RL-ONR717

R718

R715

+5V-ST

19R763

RL-ON

RL-ON

Q703

22

RL-ON

To other circuts

Turns on Q706Creates 5V General

LD703 Lights Red and Green

Outputs M5V On command which turns on the M5V regulator on SMPS

5V General allows 5V DetectTo be Generated

Outputs VS-On which turns on Va and Vs in the Power Supply

A

C

B

B

D

B

B

32

Outputs Relay On (RL-ON) commandTurns on Power Supply RelayTurns on 16V Power Supply

B

+5V-General

116V 2B

44

42PG20 Power Supply Controls (Microprocessor Side) Run42PG20 Power Supply Controls (Microprocessor Side) Run

16633Ω

33Ω

VS_VA-ON 16733Ω


This test can confirm the proper operation of the SMPS without the need to exchange the board.This Power Supply can operate in a No Load State. This means that by applying AC power to CN101 and all other plugs disconnected, this power supply will function. Simply removing P813 (Lower Right Hand Side of the Board), will cause the “AUTO” Pin 22 to go high from its normal low state allowing the Power Supply to go to full power on mode whenAC Power is Supplied. Be careful after this test and make sure the VA and VS lines have discharged before reconnecting the supply cables.

Switch Mode Power Supply Static TestSwitch Mode Power Supply Static Test

If the Y-SUS, Z-SUS and X Boards are working normal, when the SMPS comes up to full power on,

“Display Panel Reset” will be visible. Shorting the Auto Pattern Gen. test points at this time shouldresult with test patterns on the screen.

If either Y-SUS or Z-SUS is causing the power supply to shutdown, unplug the Z-SUS.(Remember, Vs is routed to the small vertical Z-SUS Board [P1 pin 11] for the output FETs.)This will allow the Y-SUS to function. Also, if you unplug the Y-SUS from the SMPS andjump the 5V VCC line to any 5V location on the Control Board the Control Board will function.

For a “Stand-Alone” static test for the Power Supply, apply the usual 2 100Watt light Bulbs test on the Vs output line for a simulated load. If the Power Supply operates in this condition, it is assured it can maintain its output power under load.


SMPS Static (Light Bulb) Load TestSMPS Static (Light Bulb) Load Test


2

4

6

8

10

12

14

16

18

22

16V

Gnd

NC

Gnd

5VSTB

5VSTB

Gnd

Gnd

AC Det

VS_ON

Auto Gnd

20

3

5

7

9

11

13

15

17

19

21

Gnd

NC

Gnd

5VSTB

5VSTB

Gnd

Gnd

5_V Det

RL_ON

M5V_ON

1 15V

P813

AC Power Applied AC Det (Pin 18) and 5V STB (Pins 9 ~ 12) are 5V.

100Ω ¼ watt resistor added from 5V STB (Pins 9 ~ 12) to RL ON (Pin 19) closes relay RL101 turning on the 16V Supply

100Ω ¼ watt resistor added from 5V STB (Pins 9 ~ 12) to VS _ON (Pin 20) brings the VA and VS Lines high

100Ω ¼ watt resistor added from 5V STB (Pins 9 ~ 12) to M5V_ ON (Pin 21) brings the 5V VCC line high

Ground the Auto Ground (Pin 22) on P813 Remove AC between each test step

Switch Mode Power Supply Static Test (Forcing on the SMPS in staSwitch Mode Power Supply Static Test (Forcing on the SMPS in stages)ges)


Va and Vs AdjustmentsVa and Vs AdjustmentsPanel Voltage Label Pull P813

Apply AC PowerPower Supply Starts.

This Power Supply will come up and run with

“NO” load.P812 pulled.

Use Full White Raster

Y-Z-SUS Runs “Yes”Both Y and Z waveforms

Generated “Yes”

Vs TPP812

Pin 1 or 2

Va TPP812

Pin 5 or 6


Standby Run ResistanceConnector Pin Number

CN101 120VAC 120VAC 480K

CN101 and P812 Pin ID and VoltagesCN101 and P812 Pin ID and Voltages

1 and 3

Voltage and Diode Mode Measurements for the SMPS.All voltages from a working unit. All resistance from disconnected Board.

1.37V5VM5V10

1.47V5VM5V9

Gnd0VGnd8

Open*65VVa7

Open*65VVa6

Gnd0VGnd5

n/cn/cn/c4

Gnd0VGnd3

Open*195VVs2

Open*195VVs1

Diode ModeRun LabelPinP812 Connector "Power Supply Board“ to Y-SUS

There are No Stand-By Voltages

* Note: This voltage will vary in accordance with Panel Label

Diode Mode Readings with all Connectors Disconnected using the Diode mode on the DVM using the Diode mode on the DVM


Voltage and Diode Mode Measurements for the SMPS

Diode Mode Readings with all Connectors Disconnected using the Diode mode on the DVM

P803 Odd Pins ID and VoltagesP803 Odd Pins ID and Voltages

Open5V0V0VAUTO22

Open0V3.24V0VM5V_ON21

Open0V3.2V0VVs_On20

Open0V3.73V0VRL_On19

2.3V5V5V5VAC Det18

1.92V5V5V0V5_V Det17

GndGndGndGndGnd13-16

1.43V5V5V5V5V9-12

GndGndGndGndGnd7-8

OpenNCNCNCNC5-6

GndGndGndGndGnd3-4

1.5V16.5V16.5V0V15V1-2

Diode ModeNo LoadRun STBYLabelPin

P813 Connector "SMPS" to P701 "Main Board"


(2) Va or Vs Short: Power LED is lit Red in stand by. At Power On, goes to Blue. Relay closes. Power LED Blinks twice and 3rd blink stays blue. Relay opens. Power Supply outputs STBY 5V. 16V goes to 0V. 5Vcc drops to 1.7V. No Va or Vs. With Relay closed, 330V OK, then when relay opens, it drops to 155V.

Using the Front Power LED for visual cluesUsing the Front Power LED for visual clues

(3) 16V Short: Power LED is lit Red in stand by. At Power On, Power LED cycles Red and Blue. Relay clicks rapidly on and off. STBY 5V line toggles with relay from 2.2V to 5V.

(4) 5Vcc Short: Power LED is lit Red in stand by. At Power On, goes to flashing Blue. 5Vcc line toggles rapidly between 0V to 0.7V.

(1) STBY 5V Short: Power LED does not light in stand by. No Power button function.


This Model “Combines” the Y and Z-SUS Drive Board together.

This Section of the Presentation will cover troubleshooting the Y-SUS Board for the SingleScan Plasma. Upon completion of the Section the technician will have a betterunderstanding of the operation of the circuit and will be able to locate voltage andresistance test points needed for troubleshooting and alignments.

OperatingOperating VoltagesVoltages

SMPS Supplied VA VS VCC M5V

Y-Z-SUS Developed -VY V SET UP VR602V SET DN VR601VSC16V

VA supplies the Panel Vertical Grid VS Supplies the Panel Horizontal Grid5V Supplies Bias to Y-Z-SUS, Control via the Y-SUS

-VY Sets the Negative excursion of the Y-SUS Drive WaveformRamp UP sets Pitch of the Top Ramp of the Drive Waveform V Set Down sets the Pitch of the Bottom Ramp of the Drive WaveformVSC Set the amplitude of the complex waveform.To the X-Drives Board and the TCP IC’s

YY--SUS BOARD SECTIONSUS BOARD SECTION

• Adjustments• DC Voltage and Waveform Checks• Resistance Measurements

Overview


Diagram of Y-Sustain Board

YY--SUS Block DiagramSUS Block Diagram

Generates Vsc and -Vyfrom Vs by DC/DC Converters Also controls Ramp Up/Down

Control Board

Circuits generate Y-SUStain Waveform

Distributes 5V VS Distributes 5V

Logic signals needed to

generate drive waveform

Distributes 16V and VA

Receive 5V VCC, Va, Vsfrom SMPS

Transfer Waveformto Y-Drive Board

Z-SUS Section on theSame Board

Right X Board

Display Panel

Power Supply Board - SMPS

FETs amplifY-SUStainWaveform

Left X Board


P204

VS and VA Input from the SMPS

-VY ADJ VR502

P201

VSC ADJ VR501

RAMPVR 602

P200

FS202 (Vs)4A 250V VSC-VY

To Y-Drive

To Y-Drive

V SET DN VR 601

YY--SUS Board LayoutSUS Board Layout

P801

Logic Signals from the Control Board

P202

16V and Va to Left and Right X Boards

Logic (Drive) Signals to the Y-Drive Boards

Use Y-Drive Waveform TP

VSC TPR211

-VY TPR210

Z Drive to Z Output Board

P101

Z-Bias ADJ VR905

FS701 (Va)10A

FS2015A

ZBias TP R946


Y-SUSTAIN ADJUSTMENT DETAILS

VSC and VSC and --VY AdjustmentsVY Adjustments

LowerLeft SideOf Board

These are DC levelVoltage Adjustments

VSC-VY

LowerLeft Sideof Board

VSC TPR211

MiddleLeft Sideof Board

-Vy TPR210

Voltage Reads Positive

VR501

Vsc TP

VR502 -Vy TP

Set should run for 15 minutes, this is the “Heat Run” mode.Set screen to “White Wash” mode or 100 IRE White input.

Adjust –Vy to 190V (+/- 1V)Adjust VSC to 140 (+/- 1V)

+-

+-

Heat Run, Vs, Va adjustments should have been completed.


YY--Drive (SCAN) Signal OverviewDrive (SCAN) Signal Overview

Y-Drive Board Test Point

Overall signal observed 2mS/div

Highlighted signal from figure above observed 200uS/div

Highlighted signal from figure above observed

100uS/div NOTE: If Vset DN too high, this set will go to excessive bright, then shutdown.To correct, remove the LVDS from control Board and make necessary adjustments.


Observing (Capturing) the YObserving (Capturing) the Y--Drive Signal for Drive Signal for VsetupVsetup RampRamp--Up (RAMP)Up (RAMP)

Fig 1 Top: As an example of how to lock in to theY-Drive Waveform. Fig 1 top shows the signal locked in at 4ms per/div. The signal for Vsetup is outlined within the Waveform

Fig 2 Top: At 2ms per/div. the signal for Vsetup is now easier to recognize. It is outlined within the Waveform

Fig 3 Top: At 1ms per/div. the signal for Vsetup is now clearly visible. It is outlined within the Waveform

Fig 3 Lower: At 40uSec per/division, the adjustment for Vsetup can be made.

Fig 2 Lower: At 100uSec per/division, the waveform to use for Vsetup Is now isolated.

Fig 1 Lower: At 400uSec per/division, the waveform to use for Vsetup Is now isolated.

FIG1

FIG2

FIG3

Area tobe adjusted

Area to be adjustedZoomed out

Area tobe adjusted

Outlined Area


Observing (Capturing) the YObserving (Capturing) the Y--Drive Signal for Drive Signal for VsetdnVsetdn (Ramp(Ramp--Down)Down)

Fig 1 Top: As an example of how to lock in to the Y-Drive Waveform. Figure 1 top shows the signal locked in at 4ms per/div.The outlined signal for Vsetdn is outlined within the Waveform

Fig 1 Top: At 2ms per/div. the outlined signal for Vsetdn is now easier to recognize. It is outlined within the Waveform

Fig 1 Top: At 1ms per/div. the outlined signal for Vsetdn is now clearly visible. It is outlined within the Waveform

Fig 1 Lower: At 40uSec per/division, the adjustment for Vsetdn can be made.

Fig 1 Lower: At 100uSec per/division, the waveform to use for Vsetdn Is now isolated.

Fig 1 Lower: At 400uSec per/division, the waveform to use for Vsetdn Is now isolated.

FIG1

FIG2

FIG3

Area tobe adjusted

Area tobe adjusted

Area to be adjustedZoomed out

Outlined Area


Y-SUSTAIN ADJUSTMENT DETAILS(Vs, Va, VSC, VSC, -Vy and Z-Bias Must have already been completed).

Observe the Picture while making these adjustments.

Normally, they do not have to be

done.

VV--Set Up (RAMP) and VSet Up (RAMP) and V--Set Down AdjustmentsSet Down Adjustments

Y-Drive Board Test Point


Very little alteration to the picture, the wave form indicates adistorted Vset UP. The peek widens due to the Vset UPpeeking too quickly.

The center begins to wash out and arc due to Vset UPPeeking too late and alters the start of the Vset DN phase.

Panel Waveform Adjustment

Ramp (Vset UP) too high

Ramp (Vset UP) too low

V Set Up Too High or LowV Set Up Too High or LowVset UP swing is Minimum 150vP/P Max 220vP/P


All of the center washes out due to increased Vset_DN time.

The center begins to wash out and arc due to decreased Vset DN time.

Panel Waveform Adjustment

Vset DN too low

Vset DN too high

V Set V Set DnDn Too High or LowToo High or LowVset Dn swing is Minimum 60uS Max 123uS

NOTE: If Vset DN too high, this set will go to excessive bright, then shutdown.To correct, remove the LVDS from control Board and make necessary adjustments.


V Set V Set DnDn Too High Causing ShutdownToo High Causing Shutdown

The above image is the Set Down signal set for Normal operation at 110uSec

The above image is the Set Down signal set to High (Approx. 120uSec) This is the Shutdown Threshold level. Any higher, the set will shut down.

Notice that the amplitude of the Set Down (Bottom portion) peak begins to decrease.

TimeTime

Peak

GOOD NO GOOD

NOTE: If Vset DN too high, this set will go to excessive bright, then shutdown.To correct, remove the LVDS from Control Board and make necessary adjustments.

50V per Division

5V per Division

50V per Division

5V per Division

Peak


Voltage and Diode Mode Measurements


YY––SUS P201 to SMPS P812 Plug InformationSUS P201 to SMPS P812 Plug Information


.83V5VM5V10

.83V5VM5V9

Gnd0VGnd8

Open*65VVa7

Open*65VVa6

Gnd0VGnd5

Gnd0VGnd4

NCNCNC3

Open*194VVs2

Open*194VVs1

Diode ModeRun LabelPin

P201 Connector "Y-SUS" to "Power Supply Board" P812



Voltage and Diode Mode Measurements for the Y-SUS Board


YY--SUS P202 to X Drive P211 and P311 Plug InformationSUS P202 to X Drive P211 and P311 Plug Information


Open*64.9VVa12

Open61.5VER111

Open61.5VER110

1V15.8V15V9

GndGndGnd8

GndGndGnd7

Open64.9VVa6

Open61.5VER25

Open61.5VER24

1V15.8V15V3

GndGndGnd2

GndGndGnd1


P202 Connector "Y-SUS Board" to "X-Drive” Left P211 and Right P311





YY--SUS P801 to Z Drive P1 Plug InformationSUS P801 to Z Drive P1 Plug Information


Open70.46VZSUS11

GndGndGnd10

Open70.46VZSUS9

GndGndGnd8

Open70.46VZSUS7

GndGndGnd6

Open70.46VZSUS5

GndGndGnd4

Open70.46VZSUS3

GndGndGnd2

Open*194V+Vs1


P801 Connector Y-SUS to Z Drive P1 Plug Information




P101 YP101 Y--SUS to Control Board P160 Plug InformationSUS to Control Board P160 Plug Information

These Connector pins are too close to read without possible damage to the Board

Actually a 60 Pin Connector "Only Labels for 1-19" on the Control Board

Looking closely, these test points are “every other pin”. The bottom TP represents “19”label on the Control Board.



YY--SUS P101 to Control P160 Plug InformationSUS P101 to Control P160 Plug Information

2.87V0.26VSET_UP20

GndGndGnd19

2.87V2VER_UP18

GndGndGnd17

2.87V1.2VER_DN16

GndGndGnd15

2.87V2VSUS_UP14

GndGndGnd13

2.87V0VSUS_DN12

GndGndGnd11

2.87V0.6VDATA10

GndGndGnd9

2.87V3VOSC28

GndGndGnd7

2.87V0VOSC16

GndGndGnd5

2.87V0.76VSTB4

GndGndGnd3

2.87V3.2VCLK2

GndGndGnd1

DiodeModeRun LabelPin

0.76V4.75V5V40

n/cn/cn/c39

2.87V0.6VY-Enable38

GndGndGnd37

2.87V2.9VX_ER36

GndGndGnd35

2.87V1.4VSet_DN_234

GndGndGnd33

2.87V1.9VSET_UP32

GndGndGnd31

2.87V0VSLOPE_RETE30

GndGndGnd29

2.87V0VDET_LEVEL28

GndGndGnd27

2.87V0.16VDELTA_Vy26

GndGndGnd25

2.87V0.2VPASS_TOP24

GndGndGnd23

2.87V0.2VSet_DN222

GndGndGnd21


GndGndGnd60

1.1V1.15VZ-SUS_DN59

GndGndGnd58

1.1V0.35VZ-SUS_UP57

GndGndGnd56

1.1V1.35VZ-ER_DN55

GndGndGnd54

1.1V1.25VZ-ER_UP53

GndGndGnd52

1.1V0VVZB-SEL51

GndGndGnd50

1.1V1.71VZ-BIAS49

GndGndGnd48

1.25V0VZ-ENABLE47

n/cn/cn/c46

n/cn/cn/c45

0.76V4.75V5V44

0.76V4.75V5V43

0.76V4.75V5V42

0.76V4.75V5V41


(All 5V Lines 17~21 Resistance readings are 1.7K) Pin 1 on Y-SUS is Pin 60 on Control



YY--SUS How to Check the Output FETsSUS How to Check the Output FETs

Name is printed on the components.

30F122

Forward 0.5V ~ 0.7VReverse: OL

30F122


RF2001


RF2001


45F123


45F123



Y-Drive Board works as a path supplying the Sustain and Reset waveforms which are made in the Y-SUSTAIN Board and sent to the Panel through SCAN DRIVER IC’s.

The Y-Drive Boards supply a waveform which selects the horizontal electrodes sequentially.

* 42PG20 uses 8 DRIVER ICs on 1 Y-Drive Board

YY--DRIVE SECTIONDRIVE SECTION

Y-Drive WAVEFORM

To facilitate scope attachment, solder a small wire (Stand Off) at this point.


5 Volts, Y-Drive and Logic Signals from Y-SUS Board are supplied to the Drive Board on Connectors P200.Logic Signals from P100.

YY--Drive Board IDDrive Board ID

P100

+5V

P200

Y-Drive and Logic Signals (Clock and Data) from the

Y-SUS Board

TOP BOTTOM

Check 5V supply using FL1 or C18.Measured from Floating Ground

Floating Ground from the Y-SUS Board

PANEL SIDE

Y-SUS SIDE

Floating Ground from the Y-SUS Board

Y-Drive Sig(Scan)


YY--Drive P200 Drive P200 Voltage ReadingsVoltage Readings

Back and Front of Back and Front of Connector Identical. Connector Identical. All voltages taken All voltages taken from Floating from Floating Ground. Ground.

Warning: Do not Warning: Do not hook scope ground hook scope ground up unless set up unless set plugged into an plugged into an isolation isolation transformer.transformer.

SCANSCAN

5V Floating Ground5V Floating Ground


To remove the Ribbon Cable from the Connector first carefully lift the Locking Tab fromthe back and tilt it forward ( lift from under the tab as shown in Fig 1). The locking tab must be standing straight up as shown in Fig 2.Lift up the entire Ribbon Cable gently to release the Tabs on each end. (See Fig 2)Gently slide the Ribbon Cable free from the Connector.

To reinstall the Ribbon Cable, carefully slide it back into the slot see ( Fig 3 ), be sure the Tab is seated securely and press the Locking Tab back to the locked position see ( Fig 2 then Fig 1).

Removing (Panel) Flexible Ribbon from YRemoving (Panel) Flexible Ribbon from Y--DriveDrive

Flexible Ribbon Cables shown are from a different model, but proFlexible Ribbon Cables shown are from a different model, but process is the same.cess is the same.

Fig 1 Fig 3Fig 2

Gently Pry Up Here

Locking tab in upright position

Be sure ribbon tab is releasedBy lifting the ribbon up slightlyBefore removing ribbon.


The Ribbon Cable is clearly improperly seated into the Connector. You can tell by observing the linearity.

The Locking Tab will offer a greater resistance to closing in the case.

Note the cable is crooked. In this case the Tab on the Ribbon cable was improperly seated at the bottom. This can cause bars, lines, intermittent lines abnormalities in the picture.

Remove the ribbon cable and re-seat it correctly.

YY--Drive Flexible Ribbon Incorrectly SeatedDrive Flexible Ribbon Incorrectly Seated


Using the “Diode Test” on the DVM, check the pins for shorts or abnormal loads.

YY--Drive Buffer Troubleshooting (Input Side)Drive Buffer Troubleshooting (Input Side)YOU CAN CHECK YYOU CAN CHECK Y--DRIVE USING THIS PROCEDURE.DRIVE USING THIS PROCEDURE.

RED LEAD ON “B”BLACK LEAD ON “A”

FORWARD READING 0.73V

REVERSE READING “OPEN”OL

+-

+

-

BACK or FRONT SIDE OF

Y-DRIVE Board

Any

where

A

B

VSC

n/c

FLOA

TING

GN

D

n/cOsc2 InOsc1 In

LE InCLK In

DATA Inn/cn/c

+5V

BLACK LEAD ON “B”RED LEAD ON “A”

Additional Readings

RED LEAD ON “B”

0.57V Black on Osc20.59V Black on Osc10.58V Black on LE0.60V Black on CLK0.78V Black on DATA0.50V Black on +5V

BLACK LEAD ON “B”

OL Red on Osc2OL Red on Osc1OL Red on LEOL Red on CLKOL Red on DATAOL Red on +5V

VSCAN CHECK


Using the “Diode Test” on the DVM, check the pins for shorts or abnormal loads.

YY--Drive Buffer Troubleshooting (Output Side)Drive Buffer Troubleshooting (Output Side)

RED LEAD ON Buffer IC

BLACK LEAD ON “ANY”OUTPUT LUG.

READING 0.73 V

OUTPUT LUGS

BLACK LEAD ON Buffer IC

RED LEAD ON “ANY”OUTPUT LUG.

READING “OPEN”

YOU CAN CHECK ALL 8 Buffer ICs USING THIS PROCEDUREYOU CAN CHECK ALL 8 Buffer ICs USING THIS PROCEDURE

• Any of these output lugs can be tested.

• Look for shorts indicating a defective Buffer IC

Indicated by white outline

BACK SIDE OF Y-DRIVE Board

Indicated by white outline

+-

+ -

FloatingGround

96 Output Pins

96 Output Pins per/Buffer

8 Ribbon cables (Horizontal Grids)

768 Total Horizontal Grids controlling Vertical resolution48 48


• DC Voltage and Waveform Test Points• Z BIAS Alignment• Resistance Test Points

Operating Voltages Operating Voltages Y-SUS Supplied VA VS 5V Vcc

Developed on Y-SUS Z Bias

This Section of the Presentation will cover troubleshooting the Z-Drive section of the Y-Z-SUS Board Assembly. Upon completion of this section the Technician will have a better understanding of the circuit and be able to locate voltage and resistance test points needed for troubleshooting and alignment.

ZZ--SUS BOARD SECTION OF THE YSUS BOARD SECTION OF THE Y--SUS BOARDSUS BOARD

Locations Locations


VS and VA Input from the SMPS

P201

FS202 (Vs) 4A 250V

ZZ--SUS Section Layout on the YSUS Section Layout on the Y--SUS BoardSUS Board

P801

Logic Signals from the Control Board

P202 16V and Va to Left and Right X Boards

VZ (Z-Bias)

Z Drive to Z-SUS Output Board

P101FS701 (Va)

10A

FS201 (5V)5A

VZ (Z-Bias) TP R946

ZBias TP R946

Read the Label on the back of the upper left hand side of the panel.

Adjust R946 to that voltage.

Z-SUSSection

Y-SUSSection

Y-SUSOutput

ICs

Z-Bias ADJ VR905

No IPMs

+ -


Provides the SUSTAIN PULSE and ERASE PULSE for generating SUSTAIN discharge in the panel by receiving Drive signals from the Y-Z-SUS Board.

This waveform is supplied to the panel through FPC (Flexible Printed Circuit).

Scope Probe connect point bottom leg of R1 to check Z

Output waveform

ZZ--SUS WaveformSUS Waveform

Z-Bias is a “DC” adjustment.The effects of this adjustment can beobserved on the scope looking at theZ-SUS output.

Z-SUS Board

This Waveform is just for reference to observe the effects of Zbz adjustment

Vzb voltage+- 1V100V

Z Drive Waveform

(Vzb) Z Bias VR905

2 mS/div

Note: The VzbAdjustment is aDC level adjustment

100uS/div


ZBias TP R946+ -

VZ (ZVZ (Z--Bias) AdjustmentBias) Adjustment

P801ToZ-SUS

VZ (Z-Bias)

VZ (Z-Bias) TP R946

Read the Label on the back of the upper left hand side of the panel.

Adjust R946 to that voltage.

Set should run for 15 minutes, this is the “Heat Run” mode.Set screen to “White Wash” mode or 100 IRE White input.

Adjust VZ (Z-Bias) to 100V (+/- 1V


VS VS is input at P1 pin 1 and supplied to the FETs.

Input Voltages from the YInput Voltages from the Y--SUS BoardSUS Board

ZZ--SUS Board UnderstandingSUS Board Understanding

The ZThe Z--SUS Board in this model is only a small vertical board with outpSUS Board in this model is only a small vertical board with output FETs.ut FETs.Drive waveforms are generated on the YDrive waveforms are generated on the Y--SUS Board.SUS Board.

Z Drive Signals to Power FET’s

Input Signals from the YInput Signals from the Y--SUS BoardSUS Board


Diagram of Z-SUSTAIN Section on the Board

ZZ--SUS Section (On YSUS Section (On Y--SUS Board) Block DiagramSUS Board) Block Diagram

Circuits generate erase,sustain waveforms

Generates Z Bias 100V

Distributes Logic Signals

M5V, VA, VS

FET Makes Drive waveform Display Panel

Via FPC

(flexible printed circuit )

Control Board

Y-SUS Board

Z-SUS FETs

Via P801 to P1

NO IPMs

Z-SUS Board

Z-SUS Section of the Y-SUS Board Receives

VS, VA, M5V



YY--SUS P801 Connector to ZSUS P801 Connector to Z--SUS P1 Voltage and Diode Mode CheckSUS P1 Voltage and Diode Mode CheckVoltage and Diode Mode Measurements


Open70.46VZSUS11

GndGndGnd10

Open70.46VZSUS9

GndGndGnd8

Open70.46VZSUS7

GndGndGnd6

Open70.46VZSUS5

GndGndGnd4

Open70.46VZSUS3

GndGndGnd2Open*194V+Vs1


P801 Connector "Y-SUS Board" to "Z-SUS Out" P1



CONTROL BOARD SECTIONCONTROL BOARD SECTION

• DC Voltage and Waveform Test Points• Resistance Test Points

Signals Signals

Y-SUS Supplied 5V VCC

Developed on the 1.8VControl board (2) 3.3V

This Section of the Presentation will cover troubleshooting the Control Board Assembly. Upon completion of this section the Technician will have a better understanding of the circuit and be able to locate voltage and resistance test points needed for troubleshooting.

Main Board Supplied LVDS Signal

Operating Voltages Operating Voltages


Control Board IdentifiedControl Board Identified X001Crystal

TempLEDs

P162P161

P160

LVDS

ToY-Z-SUS

To X Drive Left To X Drive Right

P164 P131

IC201MCM

P121

IC212

IC213

IC121

IC101

IC211

IC171IC122

IC133

AUTO GEN TESTPATTERN

Download Connection

To P101Y-SUS

5V

Part NumberLabel

3.3V0V

n/c

5V

3.3V

0V

IC171 Pin 1 ---- 3.29VPin2 ---- 1.20v Pin 3 ---- 0V

3.3V

VS_DA3V ~3.3V


Control Board PictorialControl Board Pictorial

IC121Pin 1 – 4.75VPin 2 – 3.3VPin 3 – 0V

Note: P812 on SMPS P201 on Y-SUS

IC122Pin 1 – 4.75VPin 2 – 3.3VPin 3 – 0V


Control Board TestingControl Board Testing

For quick Board test.(All Board ConnectorsDisconnected).

Jump 5V from PowerSupply to IC121 Pin 1.If the Temp LED lights,Pretty much guaranteed, Board is OK.

Quick observationOf Temp. LEDsTell if the ControlBoard is running.

When the Television has a problem related to;1) Shutdown caused by Main Board2) No PictureThis can be checked by the following. (1) Disconnect the Main Board from all Connectors. Apply AC power. Since P813 is not connected, the set will come on. Short the two pins on the Auto Test Pattern lands. If there is a picture of cycling colors, the Y-SUS, Y-Drive, Z-SUS, Power Supply, Control Boards and Panel are all OK. Same test for (2) to tell if the No Video is caused by the Main Board.

Confirm B+ to Control BoardVS_DAControl Board Check3V ~ 3.3V


Check the output of the Oscillator package. The frequency of the sine wave is 50 MHZ.Missing this clock signal can halt operation of the unit

Osc. Check: 50Mhz

Checking the Crystal Checking the Crystal ““ClockClock””

DC Voltage Check1.5V ~ 1.8V


LVDSVideo Signals from the Main Board to the Control Board are referred to as Low Voltage Differential Signals or LVDS. Their presence can be confirmed with the Oscilloscope by monitoring the LVDS signals with no input signal selected while pressing the Menu Button “on” and “off” with the Remote Control or Keypad. Loss of these Signals would confirm the failure is on the Main Board!

Example of Normal Signals measured at 200mv/cm at 5µs/cm.

Menu Off Menu ON

LVDS CableP121 on Control Board shown.Press two outside tabs inward to release.

Control LVDS SignalsControl LVDS Signals

1

3

5

7

9

11

13

15

17

19

21

2

4

6

8

10

12

14

16

18

20

22

Connector P302 Configuration - indicates signal pins.

P302 on Main Board


This Picture shows Signal Flow Distribution to help determine the failure depending on where the it shows on the screen.

The Control Board supplies Video Signals to the TCP (Tape Carrier Package) ICs.

If there is a bar defect on the screen, it could be a Control Board problem.

MCM

16 line

Resistor Array

256 Lines output Total

Basic Diagram of Control Board Control Board to X Board Address Signal Flow

IC201

Control Board Signal BlockControl Board Signal Block

MCM

DRAM

DRAMDRAM

EEPROM

2 Buffer Outputs per TCP

CONTROL Board

X-DRIVE Board

PANEL

128 Lines per Buffer


The LVDS Cable has two “Interlocks” that must be disengaged to remove the LVDS Cable.

To Disengage, press the two Locking Tabs Inward and pull the plug out.

Removing the LVDS Cable from the Control BoardRemoving the LVDS Cable from the Control Board

Press Inward

Press Inward


Voltage and Diode Mode Measurements for the Control Board


Control Connector P121 (LVDS) to Main Board P302Control Connector P121 (LVDS) to Main Board P302

GndGnd31

Open3.29V29

1.3V3.29V27

1V1.2V25

2.4V5.29V23

1V0V21

GndGnd19

1V0V17

1V0V15

GndGnd13

1V1.15V11

1V0V9

1V1.26V7

1V1.19V5

1V0V3

GndGnd1

Diode ModeRunPin

P121 Connector Odd Pins "Control" to P302 “Main”

Open0V30

Open3.29V28

GndGnd26

1V1.26V24

2.5V0.56V22

1V0.21V20

1V0V18

1V0V16

Gnd0V14

1V1.26V12

1V0V10

1V1.19V8

Gnd0V6

1V1.26V4

1V0V2

Diode ModeRunPin

P121 Connector Even Pins "Control” to P302“Main”



Control Board Connector P160 to YControl Board Connector P160 to Y--SUS P101 Voltage and Diode Mode CheckSUS P101 Voltage and Diode Mode Check

P160 These pins are very close together. When taking Voltage measurements use Caution.

In other words, there is a ground between each pin except the +5V area.

Actual Pin 1 (ground) 2 (Z-SUS-DN) 3 (ground) 4 (Z-SUS-UP) 5 (ground), etc….

Remember, this Connector has many more pins than the labels indicate.

This shows the Pin Labeling that is shown on the silk screening.

This Connector is a little confusing in its labeling.It is actually a 60 pin Connector.

This labeling refers to P160 pin ID. This too has ground between each pin. These are responsible for Z Drive signals.

14 Pins related to Z-SUS

39 Pins related to Y-SUS

Pins 17, 18, 19, 20 and 21 Deliver +5V to the Control Board from the Y-SUS. Easy to check using 20th hash mark.

20th hash mark.

FL111 and FL112 5V Fuse


1.06V4.75V5V20

1.06V4.75V5V19

1.06V4.75V5V18

1.06V4.75V5V17

n/cn/cn/c16

n/cn/cn/c15

1.31V0VZ-ENABLE14

GndGndGnd13

1.31V1.71VZ-BIAS12

GndGndGnd11

1.31V0VVZB-SEL10

GndGndGnd9

1.31V1.25VZ-ER_UP8

GndGndGnd7

1.31V1.35VZ-ER_DN6

GndGndGnd5

1.31V0.35VZ-SUS_UP4

GndGndGnd3

1.31V1.15VZ-SUS_DN2

GndGndGnd1


GndGndGnd40

1.34V0.2VSet_DN239

GndGndGnd38

1.34V0.2VPASS_TOP37

GndGndGnd36

1.34V0.16VDELTA_Vy35

GndGndGnd34

1.34V0VDET_LEVEL33

GndGndGnd32

1.34V0VSLOPE_RETE31

GndGndGnd30

1.34V1.9VSET_UP29

GndGndGnd28

1.34V1.4VSet_DN_227

GndGndGnd26

1.33V2.9VX_ER25

GndGndGnd24

1.33V0.6VY-Enable23

n/cn/cn/c22

1.06V4.75V5V21


GndGndGnd60

1.34V3.2VCLK59

GndGndGnd58

1.34V0.76VSTB57

GndGndGnd56

1.34V0VOSC155

GndGndGnd54

1.34V3VOSC253

GndGndGnd52

1.34V0.6VDATA51

GndGndGnd50

1.34V0VSUS_DN49

GndGndGnd48

1.34V2VSUS_UP47

GndGndGnd46

1.34V1.2VER_DN45

GndGndGnd44

1.34V2VER_UP43

GndGndGnd42

1.34V0.26VSET_UP41



Control P160 to YControl P160 to Y--SUS P101 Plug InformationSUS P101 Plug Information

(All 5V Lines 17~21 Resistance in Ohms readings are 1.7K) Pin 1 on Control is Pin 60 on Y-SUS



Voltage and Diode Mode Measurements can’t be made.

P161 Connector "Control Board" to "X Drive Left" P232

These pins are covered in silicon

P162 Connector "Control Board" to "X Drive Right" P331

These pins are covered in silicon

Control Board Connector P161 and P162 to XControl Board Connector P161 and P162 to X--Drive BoardsDrive Boards


Control Board Connectors to X Drive BoardControl Board Connectors to X Drive Board

Power Cables

(Va, 15V)

Signal cable

Between Ctrl. B/D and XBetween Ctrl. B/D and X--B/D measurements canB/D measurements can’’t be made.t be made.

P161 P161 P162 P162

P331P331P232P232

P211P211 P311P311


LEFT AND RIGHT XLEFT AND RIGHT X--BOARD SECTIONBOARD SECTION

RECEIVED:Va: (Voltage for Address) received from the Y-SUS board15V: received from the Y-SUS boardDrive signals (Color): Received from the Control Board for the Vertical Grids to the TCPs.

DEVELOPED:Developed on the X-Drive boards: VPP to help with over all current draw during “No Video” times when the panel is being driven. VPP shuts off the TCPs during this time. VPP is generated using Va and a drive signal from the Control board.

X-BOARDS CONTROL THE VERTICAL GRIDS WHICH DETERMINE THE HORIZONTAL PIXEL COUNT.TOTAL HORIZONTAL GRIDS 2304. TOTAL HORIZONTAL PIXELS 768

Total Buffer Count = 24(TCPs = 12 @ 2 Buffers per/TCP)

Total Output Pins = 3072 (128 per Buffer X 24 total)

Total Pixels (Horizontal) 1024(3072 / 3) Three cells per pixel (Red, Green and Blue)


Left and Right X Drive (ALeft and Right X Drive (A--BUS)BUS)

TCP IC’s shown are part of the Ribbon CableTCP IC

TCP IC

Warning: DO NOT attempt to run the set with the Heat Sink over the TCPs removed. After a very short time, these ICs will begin to self destruct due to overheating.


TCP (Tape Carrier Package)TCP (Tape Carrier Package)


TCP ICs receive RGB 16 bit signal to the PDP by connecting the PAD Electrode of the PANEL with the X Board.

TCP

Connector

Fram

e

X_B/D

Front panel H

orizontal A

dd

ressRear pa

nel Vertical A

dd

ress

TCP (Tape Carrier Package)TCP (Tape Carrier Package)

Control Board

Back side of Ribbon

Connector into X-Drive

To PanelY-SUS Board

Va and 16V


TCP TestingTCP Testing

Typical Reading 0.65VOpposite reads open

5 10 15 20 25 30 35 40 45 501

On any Gnd

On any Va4,5,6,7,44,45,46,47

10,11,12,13,14,27,28,29,30,37,38,39,40,41

Look for any TCPs being discolored.Ribbon Damage. Cracks, folds Pinches, scratches, etc…

Va VaGnd Gnd-

+


TCP Visual Observation. Damaged TCPTCP Visual Observation. Damaged TCP

This damaged TCP can,a) Cause the Power Supply to shutdownb) Generate abnormal vertical barsc) Cause the entire area driven by the TCP to be “All White”d) Cause the entire area driven by the TCP to be “All Black”e) Cause a “Single Line” defect

Warning: DO NOT attempt to run the set with the Heat Sink over the TCPs removed. After a very short time, these ICs will begin to self destruct due to overheating.


Voltage and Diode Mode Measurements for the X Drive Board


X Drive Left Connector P211 Voltage and Diode Mode CheckX Drive Left Connector P211 Voltage and Diode Mode Check


Open*64.9VVA8

Open*61.4VVPP/ER17

Open*61.4VVPP/ER16

n/an/an/c5

n/an/an/c4

Open15.4V15V3

GndGndGnd2

GndGndGnd1


P211 Connector "X Drive Left" to "Y-SUS" P202





X Drive Right Connector P311 Voltage and Diode Mode CheckX Drive Right Connector P311 Voltage and Diode Mode Check


Open*64.9VVA8

Open*61.4VVPP/ER27

Open*61.4VVPP/ER26

n/an/an/c5

n/an/an/c4

Open15V15V3

GndGndGnd2

GndGndGnd1


P311 Connector "X Drive Right" to "Y-SUS" P202




X Drive Left and Right Connector P232 and P331X Drive Left and Right Connector P232 and P331

Voltage and Diode Mode Measurements for these Connectors are difficult to read.They are too close together for safe test.

The pins are also protected by a layer of tape to prevent the tab from being released causingseparation from the Cable and the Connector.


OperatingOperating VoltagesVoltages SMPS Supplied

This Section of the Presentation will cover troubleshooting the Main Board. Upon completion of this Section the technician will have a better understanding of the operation of the circuit and will be able to locate voltage and resistance test points needed for troubleshooting and alignments.

5V3.3V (2)2.5V1.8V

5V12V16V

Developed on the Main Board

• DC Voltage and Waveform Checks• Resistance Measurements

MAIN BOARD SECTIONMAIN BOARD SECTION


Main Board Layout and IdentificationMain Board Layout and Identification

TunerIC100

Microprocessor

Component inputs

LVDSTo Control

RGB/PC

P701

P302

P303 AVIn3

To Power Supply

HDMI inputs

RS232

SPK Out

To Front

Controls

JK501

X40025 Mhz

X10012 Mhz

Audio

Audio RGB/DVI

ResetSW100

IC702

OpticalAudio

USB

HDMI 3

Remote

A/V Composite inputs

LD400

LD703

Pin 1

Pin 16


Main Board Back Side (Regulator Checks)Main Board Back Side (Regulator Checks)

MAIN Board

BACK SIDE

VIEW

IC705IC709

IC706

IC101

IC708

while the Board is turned over.

Location

IC501

Bottom Leg Pin 1

IC805

Be sure to prevent the Board from touching the frame

Use a piece of cardboard or towel to insulate.

IC7051) 5V2) 3.29V3) 0V

IC5011) 3.3V2) 1.8V3) 0V

IC7061) 5V2) 2.6V3) 1.37V

IC8051) 5V2) 3.3V3) 0V

IC7081) 5V2) 3.31V3) 0V

IC1011) 5V2) 0V3) 5V

IC7091) 3.29V2) 1.26V3) 0V


Main Board Tuner Check (Shield Off) Pins ExposedMain Board Tuner Check (Shield Off) Pins Exposed

LD400Tuner Osc.

LockOn UnlockedOff Locked

X400Tuner

ControllerOsc.

IC400Tuner

Controller

VIF Pin 16 Video Test Point

SIF Pin 14 Audio Test Point

Pin 3 Tuner B+ (5V)


MAIN Board

Main Board Tuner Video and SIF Output CheckMain Board Tuner Video and SIF Output Check

Tuner Location1Vp/p 20uSec rate

Pin 16 “Video”Signal

Pin 14 “SIF”Signal

850mVp/p 20nSec rate

USING COLOR BAR SIGNAL INPUTSDA/SCL (5V p/p)

only when changing channels.


Voltage and Diode Mode Measurements for the Main Board

Diode Mode Readings with the Board Disconnected. DVM in the Diode mode.

Main Board Plug P302 Main Board Plug P302 ““LVDSLVDS”” Voltage and Diode CheckVoltage and Diode Check

Open3.29V25

1.01V0.58V23

0.83V1.24V21

1.17V1.24V19

1.17V1.22V17

1.17V1.27V15

1.17V1.25V13

1.17V1.25V11

1.97V3.29V9

GndGnd7

GndGnd5

Open0V3

Open0V1

Diode ModeRunPin

P302 Connector "Main" Odd Pins to P121 "Control"

GndGnd26

1.5V3.29V24

1.17V1.18V22

1.17V1.21V20

1.17V1.25V18

1.17V1.21V16

1.17V1.21V14

1.17V1.21V12

1.97V3.29V10

GndGnd8

GndGnd6

Open0V4

Open0V2

Diode ModeRunPin

P302 Connector "Main" Even Pins to P121 "Control"



Voltage and Diode Mode Measurements for the Main Board

Diode Mode Readings with all Connectors Disconnected using the Diode mode on the DVM. DVM in the Diode mode.

Main Board Plug P303 VoltagesMain Board Plug P303 Voltages

121110987654321

Pin

GndGndGndGnd1.03V3.84V0VRed_GGndGndGndGnd

1.12V0V0VRed_RGndGndGndGnd

0.75V5V5VSTBY-5VGndGndGndGnd

1.18V3.29V0VKey 1GndGndGndGnd

1.18V3.29V0VKey 2GndGndGndGnd

2.99V5V5VIRDiode ModeRun STBY

P303 Connector "MAIN Board" to "Front Keys"


Voltage and Diode Mode Measurements for the Main Board P701

Main Board Plug P701 Voltage and Diode CheckMain Board Plug P701 Voltage and Diode Check

Resistance Readings with the Board Disconnected. DVM in the Diode mode.

P701

Gnd0V0VAUTO22

Open3.24V0VM5V_ON21

1.22V3.2V0VVs_On20

Open3.73V0VRL_On19

Open5V5VAC Det18

3.25V5V0V5_V Det17

GndGndGndGnd13-16

0.75V5V5V5V9-12

GndGndGndGnd7-8

OpenNCNCNC5-6

GndGndGndGnd3-4

3.8V16.5V0V15V1-2

Diode ModeRun STBYLabelPin

P701 Connector "Main Board" to "SMPS" P813


Voltage and Diode Mode Measurements for the Main Board Speaker Plug

Main Board Speaker Plug JK501 Voltage and Diode Mode CheckMain Board Speaker Plug JK501 Voltage and Diode Mode Check

JK501

Resistance Readings with the Board Disconnected. DVM in the Diode mode.

2.58V8V0V42.58V8V0V32.58V8V0V22.58V8V0V1

Diode ModeRunSBYPinCN701 Connector "Main" to "Speakers"


The Control Switch Board and Power Switch Board are located (as viewed from the rear) in the lower left hand section.

To remove, unplug the Connector P101 and remove the 2 screws. Under each screw there is a black tab. Release these tabs to lift the Board upward. Then remove the Connector from the Power Switch Board and remove it’s two screws.

Ft Control Board and Power Switch Board RemovalFt Control Board and Power Switch Board Removal


INTERCONNECT DIAGRAM (11 X 17 FOLDOUT SECTION)INTERCONNECT DIAGRAM (11 X 17 FOLDOUT SECTION)

This section shows the 11X17 foldout thatThis section shows the 11X17 foldout that’’s available in the Paper s available in the Paper and Adobe version of the Training Manual.and Adobe version of the Training Manual.

The Adobe version of this Training Manual allows the viewer to The Adobe version of this Training Manual allows the viewer to zoom in and out making reading of the small text easier.zoom in and out making reading of the small text easier.This Power Point shows a graphical representation of the 11 X 17This Power Point shows a graphical representation of the 11 X 17foldout page so clarity is limited.foldout page so clarity is limited.


Circuit Interconnect DiagramCircuit Interconnect Diagram

00

02

03

Pin 22 - Menu on

04

06

07

05

08

10

11

09

12

14

15

13

16

18

19

1701

Pin 22 - Menu off Pin 16 - Menu off

Pin 16 - Menu on

Pin 20 - Menu off

Pin 20 - Menu on

Pin 14 - Menu off

Pin 14 - Menu on

Pin 12 - Menu off

Pin 12 - Menu on

Pin 11 - Menu off

Pin 11 - Menu on

Pin 13 - Menu off

Pin 13 - Menu on

Pin 15 - Menu off

Pin 15 - Menu on Pin 21 - Menu on

Pin 21 - Menu off

Pin 19 - Menu on

Pin 19 - Menu off

01Menu On

00Menu Off22

19Menu On

18Menu Off21

03Menu On

02Menu Off20

17Menu On

16Menu Off19

05Menu On

04Menu Off16

15Menu On

14Menu Off15

07Menu On

06Menu Off14

13Menu On

12Menu Off13

09Menu On

08Menu Off12

11Menu On

10Menu Off11

Ref #StatePin

P302

01Menu On

00Menu Off22

19Menu On

18Menu Off21

03Menu On

02Menu Off20

17Menu On

16Menu Off19

05Menu On

04Menu Off16

15Menu On

14Menu Off15

07Menu On

06Menu Off14

13Menu On

12Menu Off13

09Menu On

08Menu Off12

11Menu On

10Menu Off11

Ref #StatePin

P302

1

3

5

7

9

11

13

15

17

19

21

2

4

6

8

10

12

14

16

18

20

22

Connector P302 Configuration - indicates signal pins.

Volts per division Time per division Trigger offset

42PG2042PG20PLASMA TELEVISIONPLASMA TELEVISION

This concludes the 42PG20 training

session.

Lg 42pg20 Training Manual

Documents

ysus board ydrive boards

zsus signals

zsus output board

ydrive signals

ysus board x drive boards

unified y

circuit board operation

plasma overview