COLOR TV SERVICE MANUAL CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. CHASSIS : MC-049B MODEL : 21FX5REE/RG/RGP MODEL : 21FX5REE/RG/RGP-TB website:http://biz.LGservice.com e-mail:http://www.LGEservice.com/techsup.html
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COLOR TVSERVICE MANUAL
CAUTIONBEFORE SERVICING THE CHASSIS,READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by inthe Schematic Diagram and Replacement Parts List. It is essential that these special safety parts should be replaced with the same components as recommended in this manual toprevent X-RADIATION, Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer.
General Guidance
An isolation Transformer should always be used duringthe servicing of a receiver whose chassis is not isolated fromthe AC power line. Use a transformer of adequate power ratingas this protects the technician from accidents resulting inpersonal injury from electrical shocks.
It will also protect the receiver and it's components from beingdamaged by accidental shorts of the circuitry that may beinadvertently introduced during the service operation.
If any fuse (or Fusible Resistor) in this TV receiver is blown,replace it with the specified.
When replacing a high wattage resistor (Oxide Metal FilmResistor, over 1W), keep the resistor 10mm away from PCB.
Keep wires away from high voltage or high temperature parts.
Due to high vacuum and large surface area of picture tube,extreme care should be used in handling the Picture Tube.Do not lift the Picture tube by it's Neck.
X-RAY Radiation
Warning:
To determine the presence of high voltage, use an accuratehigh impedance HV meter.
Adjust brightness, color, contrast controls to minimum. Measure the high voltage. The meter reading should indicate 23.5 ± 1.5KV: 14-19 inch, 26 ± 1.5KV: 19-21 inch,29.0 ± 1.5KV: 25-29 inch, 30.0 ± 1.5KV: 32 inchIf the meter indication is out of tolerance, immediate serviceand correction is required to prevent the possibility ofpremature component failure.
Before returning the receiver to the customer,
always perform an AC leakage current check on the exposedmetallic parts of the cabinet, such as antennas, terminals, etc.,to be sure the set is safe to operate without damage ofelectrical shock.
Leakage Current Cold Check(Antenna Cold Check)With the instrument AC plug removed from AC source,connect an electrical jumper across the two AC plug prongs.Place the AC switch in the on position, connect one lead ofohm-meter to the AC plug prongs tied together and touch otherohm-meter lead in turn to each exposed metallic parts such asantenna terminals, phone jacks, etc. If the exposed metallic part has a return path to the chassis, themeasured resistance should be between 1MΩ and 5.2MΩ. When the exposed metal has no return path to the chassis thereading must be infinite.An other abnormality exists that must be corrected before thereceiver is returned to the customer.
Leakage Current Hot Check (See below Figure) Plug the AC cord directly into the AC outlet.Do not use a line Isolation Transformer during this check. Connect 1.5K/10watt resistor in parallel with a 0.15uF capacitorbetween a known good earth ground (Water Pipe, Conduit, etc.)and the exposed metallic parts.Measure the AC voltage across the resistor using ACvoltmeter with 1000 ohms/volt or more sensitivity.Reverse plug the AC cord into the AC outlet and repeat ACvoltage measurements for each exposed metallic part. Anyvoltage measured must not exceed 0.75 volt RMS which iscorresponds to 0.5mA.In case any measurement is out of the limits specified, there ispossibility of shock hazard and the set must be checked andrepaired before it is returned to the customer.
Leakage Current Hot Check circuit
The source of X-RAY RADIATION in this TV receiver is theHigh Voltage Section and the Picture Tube.For continued X-RAY RADIATION protection, thereplacement tube must be the same type tube as specified inthe Replacement Parts List.
1.5 Kohm/10W
To Instrument'sexposed METALLIC PARTS
Good Earth Groundsuch as WATER PIPE,CONDUIT etc.
AC Volt-meter
IMPORTANT SAFETY NOTICE
0.15uF
- 4 -
DESCRIPTION OF CONTROLS
All the functions can be controlled with the remote control handset.Some functions can also be adjusted with the buttons on the frontpanel of the set.
Remote control handset
Before you use the remote control handset, please install the bat-teries. See the next page.
1. POWERswitches the set on from standby or off to standby.
2. NUMBER BUTTONSswitches the set on from standby or directly select a number.
3. MENU (or INDEX)selects a menu.selects an index page in the teletext mode (only TELETEXTmodels). (option)
4. EYE/* (option)switches the eye function on or off.
5. D / E (Programme Up/Down)selects a programme or a menu item.switches the set on from standby.scans programmes automatically.F / G (Volume Up/Down)adjusts the volume.adjusts menu settings.OKaccepts your selection or displays the current mode.
6. Q.VIEWreturns to the previously viewed programme.
7. TELETEXT BUTTONS (option)These buttons are used for teletext.For further details, see the ‘Teletext’ section.
8. PSM (Picture Status Memory)recalls your preferred picture setting.
18. VCR BUTTONScontrol a LG video cassette recorder.
19. PIP BUTTONS (option)PIPswitches the sub picture on or off.PR +/-selects a programme for the sub picture.SWAPalternates between main and sub picture.INPUTselects the input mode for the sub picture.SIZEadjusts the sub picture size.STILLfreezes motion of the sub picture.POSITIONrelocates the sub picture in clockwise direction.9/4 PIPswitches on or off the 9 or 4 sub pictures.
* : No function
COLOURED BUTTONS : These buttons are used for teletext (onlyTELETEXT models) or programme edit.
(Without TELETEXT / PIP)
POWER MUTE
1 2 3
4 5 6
7 8 9
MENU/INDEX TV/AV0
EYE/
Q.VIEW LIST
I / II /( )PR
( )PR
OK VOLVOL
PSM SSM/ SLEEP
PICTURE SOUND
/
TURBO/
FAVOURITE
TV
1
2
3
4
5
6
8
10
11
12
13
14
15
1716
9
TEXT/MIX/ SIZE/ HOLD/
Q.VIEW LIST
UPDATE/
PSM SSM/ SLEEP/ M
X TIME/ REVEAL/ ?
PICTURE SOUND
/TURBO/
FAVOURITE
7
(With TELETEXT / W ithout PIP)
- 6 -
1. MAIN POWER (ON/OFF)switches the set on or off.
2. POWER/STANDBY INDICATORilluminates brightly when the set is in standbymode.dims when the set is switched on.
3. REMOTE CONTROL SENSORNote : Only use the supplied remote controlhandset. (When you use others, they’ll be notable to function.)
4. MENUselects a menu.
5. OKaccepts your selection or displays the currentmode.FF / GG (Volume Up/Down)adjusts the volume.adjusts menu settings.DD / EE (Programme Up/Down)selects a programme or a menu item.switches the set on from standby.
6. AUDIO/VIDEO IN SOCKETS (AV2) (option)Connect the audio/video out sockets of exter-nal equipment to these sockets.
7. HEADPHONE SOCKET (option)Connect the headphone plug to this socket.
8. EYE (option)adjusts picture according to the surroundingconditions.
Note : Shown is a simplified representation offront or side panel. Here shown may be some-what different from your set.
21FX4R series
17/21FX5R series
Front panel
Side panel
VID
EO
L/M
ONO
RA
UD
IO
AV2
7
6
1 2 3 4 5 8
1 2 3 4 5 8
- 7 -
SPECIFICATIONSNote : Specification and others are subject to change without notice for improvement.
V ScopeThis specification can be applied to all the television related toMC-049B Chassis.
V Test and Inspection Method1) Capacity : Follow LG electronics TV testing Standard.2) Another Required Standard
- EMI : Following CE Standard (EN55020, EN55013)- Safety : Following CB Standard (EN55013)
V Requirement for TestTesting for standard of each par must be followed in belowcondition
1) Temperature : 20 ± 5°C(CST must be tested 40 ± 5°C . Humidity : 50%)
2) Relative Humidity : 65 ± 10%3) Power : Standard input Voltage (110-240V~, 50/60Hz)4) Measurement must be performed after heat-run more than
20min.5) Adjusting Standard for this chassis is followed a special
standard.
No
1
2
3
4
5
6
7
8
Item
Receiving System
Receiving Channel
Input Voltage
Market
Screen Size
Tuning System
Operating Environment
Storage Environment
Remark
For EU/ For Non EU
For EU/ For Non EU
NTSC-M (Multi - model)
Non EU
EU
FLAT / CONVENTIONAL
200 PR. (OPTION)
Specification
1) PAL/SECAM BG
2) PAL/SECAM DK
3) PAL I/I
4) NTSC M
5) SECAM-L/L’
6) NTSC 4.43(AV)
1) VHF : E2 ~ E12
UHF : E21 ~ E69
CATV : S1 ~ S20
HYPER : S21 ~ S41
2) L/L’ : B,C,D
3) VHF : 02 ~ 13
UHF : 14~ 69
CATV : 02 ~ 71
110-240V~, 50/60Hz
240V~, 50Hz
EU,CIS, China, Asia, Africa
14” ~ 21”
FVS 100Program
1) Temp. : 0 ~ 45 deg
2) Humidity: 85% under
1) Temp. : -20 ~ 60 deg
2) Humidity: 85% under
V General Specification
1. Application ObjectThese instructions are applied to all of the color TV, MC-049B.
2. Notes(1) Because this is cold chassis, it is not necessary to use an
isolation transformer. However, the use of isolationtransformer will help protect test instrument.
(2) But, operate it using a transformer between the powersupply line and chassis input to prevent electric shock andto protect the test instrument.
(3) All adjustments must be done in correct sequence.(4) However, for the better productivity, it can be changed in
pre-permitted range.(5) Environment conditions : If not specified, it must be done in
following conditions.1) Temperature : 25±5°C2) Humidity : 65±10%
(6) Power supply of a SET which is adjusted is (100-240V~)±10%, 50~60 Hz
(7) If not specified, the receiver must be operated for morethan 20 minutes period to the adjustment.
(8) Signal : Receive the standard color signal (65dB±1dB uV)LG standard signal means the digital pattern,EU05 CH(PAL)
3. Focus voltage adjustment
(1) Receive the LG standard pattern(digital pattern, PAL : Fig 1 & NTSC : Fig2)
(2) Set the picture condition on ‘STANDARD’ mode.(3) Adjust the Focus volume of FBT for the best focus of
horizontal line A, vertical line B.
4. Purity & Convergence adjustment
4.1. Purity adjustment
(1) Preparation1) Receive the RED Raster Pattern for purity adjustment.
(11CH)2) Demagnetize the CPT and cabinet with a degaussing coil.
(2) Adjustment1) Pre-adjust the static convergence(STC) with 4 and 6-
pole magnet.2) Push the DY all way to the CPT panel.
3) Turn the purity magnet (2-pole magnet) so that the greenportion of left side and the blue portion of right side havesame portion.
4) Pull the DY slowly and fix it when the whole screenbecome red.
4.2. Convergence adjustment
(1) Preparation
1) Receive the Cross Hatch pattern for convergenceadjustment. (09CH)
2) Let the contrast at the adequate luminance level.
(2) Adjustment1) Converge the RED vertical line and BLUE vertical line in
the same line by changing the angle between the 2 tabsof the 4 pole magnet.
2) Converge the RED horizontal line and BLUE horizontalline in the same line by turning the 2 tabs of the 4polemagnet. This time, do not changing the angle betweenthe 2 tabs.
3) Converge the R,G,B vertical line in the same line bychanging the angle between the 2 tabs of the 6polemagnet.
4) Converge the R,G,B horizontal line in the same line byturning the 2 tabs of the 6pole magnet. This time, do notchange the angle between the 2 tabs.
5. Screen voltage & White balanceadjustment
Screen adjustment mode:INSTART for line SVC MODE thenADJ.Vary screen volume of the FBT till horizontal line appear andstop to the point that it starts to disappear.
5-1. Screen voltage adjustment
(1) Receive the PAL or SECAM(NTSC) signal into RF moderegardless of channel.
(2) If you press the “ADJ”button in LINE SVC mode(IN-STARTbutton),the LINE SVC mode changes to screen adjustmentmode.
(3) Adjust the screen volume of FBT jack,When width line isseen turn the FBT screen volume at the position ofdisappearance it.
(4) Press the TV/AV button to exit SVC mode.
5-2. White balance adjustment- Prior to this adjustment, the Screen Voltage adjustment must
be finished.
(1) Necessary Instrument1) Auto White Balance Meter2) Color Analyzer (CA-100)3) Factory SVC Remote control
(2) Adjustment1) Make the picture luminance 35±10 Ft-L by changing the
“CONTRAST” and “BRIGHTNESS”.
- 8 -
ADJUSTMENT INSTRUCTIONS
<Fig 1> <Fig 2>
2) Enter the white balance adjust mode with a factoryremote control.
3) Adjust HIGh Light status of WDR R, WDR B at WDR G.4) Make the Picture luminance 4.5±1 Ft-L by changing the
‘contrast’ and ‘brightness’.5) Adjust LOW Light status of CUT R, CUT B at CUT G.6) Repeat 1) ~ 5) until both low and high have same color
temperature with below.
* Note: When adjusting white balance automatically, connect theadjustment JIG in SVC mode. (When pressing IN-START,MUTE button on remote control for adjustment orderly, itchanges to SVC mode and screen displays SVC.)
* White balance auto adjustment- Jig initial setting data
2. White balance IIC Parameter
6. SUB Brightness adjustmentReceiving signal : Digital pattern (PAL : EU05CH)
1) In the LINE SVC MODE(IN-START key), selectSERVICE11 change S-BRI by VOL ± key
2) Change S-BRI data till 2~3 Gray scale of the pattern canbe discerned.
7. Deflection setting Data Adjustment
7.1 preparation(1) At adjustment mode(IN-START button on remote control of
adjustment), change to LINE SVC 2 mode to adjust thedeflection.
(2) Press Channel UP/DOWN button for desirous functionadjustment.
(3) Press Volume UP/DOWn button to adjust the data(4) Tune the TV set receive a digital pattern.
7.2 Adjustment
<Note>First, adjust deflection at 50Hz of PAL signal.Then, adjust deflection at 60Hz of NTSC signal (RT)In case of PAL only model, adjust deflection at 50Hz of PALsignal.Store the deflection adjustment data in EEPROM by usingENTER button before adjusting PIP position.After finishing deflection adjustment, press the ENTER buttonto enter or exit PIP position.
(1) VA (Vertical Amplitude)Adjust so that the circle of a digital circle pattern may belocated within the effective screen of the CPT.
(2) VL(Vertical Linearity)Adjust so that the boundary line between upper and lowerhalf is in accord with geometric horizontal center of theCPT.
(3) SC(S-Correction)Adjust so that all distance between each horizontal linesare to be the same.
(4) VS (Vertical Shift)Adjust so that the horizontal center line of a digital circlepattern is in accord with geometric horizontal center of theCPT.
(5) HS(Horizontal Shift)Adjust so that the vertical center line of a digital circlepattern is in accord with geometric vertical center of theCPT.
(6) EW(Horizontal Shift)Adjust so that a digital circle pattern looks like exact circle.
(7) ET(East-west Trapezium)Adjust to make the length of top horizontal line same with itof the bottom horizontal line.
(8) EP(East-west Parabola)Adjust so that middle portion of the outermost left and rightvertical line looks like parallel with vertical lines of th CPT.
(9) ES(East-west Symmetric)Adjust until the upper and lower corner of the screensymmetric.
(10) EC(East-west Corner)After completing the EP adjustment, adjust so that thecorner vertical line to be straight..
- 9 -
AXIS
X
Y
Color Temperature
288
295
9000°K
266
273
13000°K
EU N-EU
<Table 1> White Balance Color axis
Menu
CUT R
CUT G
CUT B
WDR R
WDR G
WDR B
LOW LIGHT
HIGH LIGHT
0 ~ 511
0 ~ 511
0 ~ 511
0 ~ 511
0 ~ 511
0 ~ 511
60
60
60
400
400
400
Range DATA
<Table 2> White Balance Initial Data
<Table 3> White Balance Initial Data1. IC
VCD IC
EP_ROM
VCT49xyi
24C16
Micronas
ST, ATMEL 0 A 0
Name Maker Algorithm
Menu
Speed/ Plus 1 1 1 1
Program
Sub Add
Start Bit
Stop Bit
Offset
Polarity
EP_Rom_S
R_Amp
TWBeng_v049
1C8
12
4
0
1
9091
R_Cut
TWBeng_v049
1C3
12
4
0
1
8A8B
B_Amp
TWBeng_v049
1CA
12
4
0
1
9495
Program
Vcd Slave
TWBeng_v049
BCF0
Program
Eprom_Slave
TWBeng_v049
AC
Speed
1
Delay
30
B_Cut
TWBeng_v049
1C5
12
4
0
1
8E8F
(11) BOWAdjust the left and right crooked line on upper and lowerside.
(12) ANGLEAdjust the vertical slope
(13) PIP-PAdjust until the distance between PIP and main picturebecomes about 1~2mm.
8. FM transmitter or W ireless sound(optional function)
- Not available for RZ model for EU market.FM Transmitter MODEL TX/RX Check
- TV sound can be transmitted by Frequency modulation.- 2 Types of FM TX module (High/ Low) is available.
- High band transmission channels: 106.7, 106.9, 107.1, 107.3, 107.5, 107.7, 107.9MHz
1) Receive signal which has proper sound signal.2) Select on of TX frequency in th OSD MENU.
MENU -> SOUND -> TRANSMITTER(Wireless sound)-> Select TX frequency (e.g. 87.7MHz)
3) Choose the same frequency (e.g. 8.7MHz) in thereceiver (e.g. Special remote/ FM Radio receiver)
4) Check the sound out in the receiver.
9. OPTION
1) This decides function in accordance with model.Press the SVC TX adjustment button (IN-START button) atSVC mode, then adjust the option at OPTION 1,2,3,4,5 mode.
2) Mark the option adjustment data like [104,137,162,117,148]in BOM.
O Mark of BOMLEVEL PART NO. SPECIFICATION DESCRIPTION JOP EXP.