COLOR TELEVISION RECEIVER Chassis : S51A Model: CS29D4V3X/AAG COLOR TELEVISION RECEIVER CONTENTS Precautions Specifications and IC Data Disassembly and Reassembly Alignment and Adjustment Troubleshooting Exploded View and Parts List Electric Parts List Block Diagram PCB Layout Diagram Wiring Diagram Schematic Diagrams 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11.
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COLOR TELEVISION RECEIVER - f01. · PDF fileChassis : S51A Model: CS29D4V3X/AAG COLOR TELEVISION RECEIVER CONTENTS Precautions Specifications and IC Data Disassembly and Reassembly
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COLOR TELEVISION RECEIVERChassis : S51AModel: CS29D4V3X/AAG
1. Be sure that all of the built-in protectivedevices are replaced. Restore any missingprotective shields.
2. When reinstalling the chassis and its assemblies, be sure to restore all protectivedevices, including: nonmetallic control knobsand compartment covers.
3. Make sure that there are no cabinet openingsthrough which people—particularly children—might insert fingers and contactdangerous voltages. Such openings includethe spacing between the picture tube and thecabinet mask, excessively wide cabinetventilation slots, and improperly fitted back
covers.
If the measured resistance is less than 1.0megohm or greater than 5.2 megohms, anabnormality exists that must be correctedbefore the unit is returned to the customer.
4. Leakage Current Hot Check (Figure 1-1):Warning: Do not use an isolation transformer during this test. Use a leakage-current tester or a metering system that complies with American National StandardsInstitute (ANIS C101.1, Leakage Current forAppliances), and Underwriters Laboratories(UL Publication UL1410, 59.7).
5. With the unit completely reassembled, plugthe AC line cord directly into the power outlet. With the unit’s AC switch first in theON position and then OFF, measure the current between a known earth ground (metalwater pipe, conduit, etc.) and all exposedmetal parts, including: antennas, handlebrackets, metal cabinets, screwheads and control shafts. The current measured shouldnot exceed 0.5 milliamp. Reverse the power-plug prongs in the AC outlet and repeat thetest.
Fig. 1-1 AC Leakage Test
6. Antenna Cold Check: With the unit’s AC plug disconnected from theAC source, connect an electrical jumper acrossthe two AC prongs. Connect one lead of theohmmeter to an AC prong. Connect the otherlead to the coaxial connector.
7. X-ray Limits:The picture tube is especially designed to pro-hibit X-ray emissions. To ensure continued X-ray protection, replace the picture tube onlywith one that is the same type as the original.Carefully reinstall the picture tube shields andmounting hardware; these also provide X-rayprotection.
8. High Voltage Limits:High voltage must be measured each time ser-vicing is done on the B+, horizontal deflectionor high voltage circuits. Correct operation ofthe X-ray protection circuits must be reconfirmed whenever they are serviced.(X-ray protection circuits also may be called
“horizontal disable” or “hold-down”.)
Heed the high voltage limits. These includethe X–ray Protection Specifications Label, andthe Product Safety and X-ray Warning Note onthe service data schematic.
Precautions
Samsung Electronics 1-1
LEAKAGECURRENTTESTER
DEVICEUNDERTEST
TEST ALLEXPOSED METAL
SURFACES
2-WIRE CORD
ALSO TEST WITHPLUG REVERSED
(USING AC ADAPTERPLUG AS REQUIRED)
EARTHGROUND
(READING SHOULDNOT BE ABOVE
0.5mA)
Follow these safety, servicing and ESD precautions to prevent damage and protect against potentialhazards such as electrical shock and X-rays.
1-1 Safety Precautions (Continued)
9. High voltage is maintained within specifiedlimits by close-tolerance, safety-related components and adjustments. If the high voltage exceeds the specified limits, checkeach of the special components.
10. Design Alteration Warning:Never alter or add to the mechanical or electrical design of this unit. Example: Do notadd auxiliary audio or video connectors. Suchalterations might create a safety hazard. Also,any design changes or additions will void themanufacturer’s warranty.
11. Hot Chassis Warning:Some TV receiver chassis are electrically connected directly to one conductor of the ACpower cord. If an isolation transformer is notused, these units may be safely serviced onlyif the AC power plug is inserted so that thechassis is connected to the ground side of theAC source.
To confirm that the AC power plug is inserted correctly, do the following: Using an AC voltmeter, measure the voltage between the chassis and a known earth ground. If the reading is greater than 1.0V, remove the ACpower plug, reverse its polarity and reinsert.Re-measure the voltage between the chassisand ground.
12. Some TV chassis are designed to operate with85 volts AC between chassis and ground,regardless of the AC plug polarity. These unitscan be safely serviced only if an isolationtransformer inserted between the receiver andthe power source.
13. Some TV chassis have a secondary groundsystem in addition to the main chassis ground.This secondary ground system is not isolated from the AC power line. The twoground systems are electrically separated byinsulating material that must not be defeatedor altered.
14. Components, parts and wiring that appear tohave overheated or that are otherwise damaged should be replaced with parts thatmeet the original specifications. Always determine the cause of damage or overheat-ing, and correct any potential hazards.
15. Observe the original lead dress, especiallynear the following areas: Antenna wiring,sharp edges, and especially the AC and highvoltage power supplies. Always inspect forpinched, out-of-place, or frayed wiring. Donot change the spacing between componentsand the printed circuit board. Check the ACpower cord for damage. Make sure that leadsand components do not touch thermally hotparts.
16. Picture Tube Implosion Warning:The picture tube in this receiver employs“integral implosion” protection. To ensurecontinued implosion protection, make surethat the replacement picture tube is the sameas the original.
17. Do not remove, install or handle the picturetube without first putting on shatterproofgoggles equipped with side shields. Neverhandle the picture tube by its neck. Some “in-line” picture tubes are equipped with a permanently attached deflection yoke; do nottry to remove such “permanently attached”yokes from the picture tube.
18. Product Safety Notice: Some electrical and mechanical parts havespecial safety-related characteristics whichmight not be obvious from visual inspection.These safety features and the protection theygive might be lost if the replacement compo-nent differs from the original—even if thereplacement is rated for higher voltage,wattage, etc.
Components that are critical for safety areindicated in the circuit diagram by shading, ( ) or ( ).
Use replacement components that have thesame ratings, especially for flame resistanceand dielectric strength specifications. A replacement part that does not have thesame safety characteristics as the originalmight create shock, fire or other hazards.
Precautions
1-2 Samsung Electronics
!
1-2 Servicing Precautions
1. Servicing precautions are printed on the cabinet. Follow them.
2. Always unplug the unit’s AC power cord fromthe AC power source before attempting to: (a)Remove or reinstall any component or assembly, (b) Disconnect an electrical plug orconnector, (c) Connect a test component inparallel with an electrolytic capacitor.
3. Some components are raised above the printedcircuit board for safety. An insulation tube ortape is sometimes used. The internal wiring issometimes clamped to prevent contact withthermally hot components. Reinstall all suchelements to their original position.
4. After servicing, always check that the screws,components and wiring have been correctlyreinstalled. Make sure that the portion aroundthe serviced part has not been damaged.
5. Check the insulation between the blades of theAC plug and accessible conductive parts(examples: metal panels, input terminals andearphone jacks).
6. Insulation Checking Procedure: Disconnect thepower cord from the AC source and turn thepower switch ON. Connect an insulationresistance meter (500V) to the blades of the ACplug.
The insulation resistance between each bladeof the AC plug and accessible conductive parts(see above) should be greater than 1 megohm.
7. Never defeat any of the B+ voltage interlocks.Do not apply AC power to the unit (or any ofits assemblies) unless all solid-state heat sinksare correctly installed.
8. Always connect a test instrument’s groundlead to the instrument chassis ground beforeconnecting the positive lead; always removethe instrument’s ground lead last.
Precautions
Samsung Electronics 1-3
Warning1: First read the “Safety Precautions” section of this manual. If some unforeseen circumstance creates a conflict between the servicing and safety precautions, always follow the safety precautions.
Warning2: An electrolytic capacitor installed with the wrong polarity might explode.
1. Some semiconductor (“solid state”) devicesare easily damaged by static electricity. Suchcomponents are called ElectrostaticallySensitive Devices (ESDs); examples includeintegrated circuits and some field-effect transistors. The following techniques willreduce the occurrence of component damagecaused by static electricity.
2. Immediately before handling any semiconductor components or assemblies, drain theelectrostatic charge from your body by touching a known earth ground. Alternatively,wear a discharging wrist-strap device. (Besure to remove it prior to applying power—this is an electric shock precaution.)
3. After removing an ESD-equipped assembly,place it on a conductive surface such as aluminum foil to prevent accumulation ofelectrostatic charge.
4. Do not use freon-propelled chemicals. Thesecan generate electrical charges that damageESDs.
5. Use only a grounded-tip soldering iron whensoldering or unsoldering ESDs.
6. Use only an anti-static solder removal device.Many solder removal devices are not rated as“anti-static”; these can accumulate sufficientelectrical charge to damage ESDs.
7. Do not remove a replacement ESD from itsprotective package until you are ready toinstall it. Most replacement ESDs are packaged with leads that are electrically shorted together by conductive foam, aluminum foil or other conductive materials.
8. Immediately before removing the protectivematerial from the leads of a replacement ESD,touch the protective material to the chassis orcircuit assembly into which the device will beinstalled.
9. Minimize body motions when handlingunpackaged replacement ESDs. Motions suchas brushing clothes together, or lifting a footfrom a carpeted floor can generate enough static electricity to damage an ESD.
Precautions
1-4 Samsung Electronics
1-3 Precautions for Electrostatically Sensitive Devices (ESDs)
Specifications and IC Data
Samsung Electronics 2-1
2. Specifications and IC Data
2-1 Specifications
T e lev is io n S y s tem :
C hann e ls :
In term ediate-F requ enc ies (MH z ):
P ic tu re T ub e:
P ower R equ irem ents : AC 100 ~ 260V, 50/60H Z or AC 160 ~ 260V, 50/60H Z
Antenn a Inp u t Im pedanc e :V H F ,U H F : T eles c op ic dip o le antenn a(75Ω unb alanc ed ty pe )
Speak er Im pedanc e : 8Ω , 10W + 10W
MO D E L S YS T E M
CI P AL -I (U H F )
CII P AL -I (V H F /U H F )
CX P AL -B /G ,S E C AM-B/G
CK P AL -B /G ,D /K,S E C AM-B /G ,D /K
CB P AL -B /G
CS P AL -B /G ,D /K,S E C AM-B /G ,D /K,NT4 .43,NT3.58
SYSTEMBAND
PAL/SECAM-B/G,I
PAL/SECAM-D/K
SECAM-K1,PAL-D NTSC-M
VHF 2-12 1-13 2-9 2-13
UHF 21-69 21-69 13-57 14-69
SYSTEMBAND
PAL/SECAM-B/G
PAL/SECAM-D/K,K1
PAL-I NTSC-M
Picture IF Carrier 38.90 38.90 38.90 38.90
Sound IF Carrier 33.40 32.40 32.90 34.40
Color Sub Carrier 34.47 34.47 34.47 35.32
25 Inch A59KPR84XQuick start, in-line-gun,Black stripe,90° degree deflection
29 Inch
30 Inch
A68KVL74X
A70QBZ791X
2-2 IC Line Up
Specifications and IC Data
2-2 Samsung Electronics
L O C NO NO S pecification D escription R emarks
H IC 101 1 P AP 103T IF P R E -AMP
IC 201 2TD A8844 P AL /S E C AM/NTS C /S E C AM-L
TD A8843 P AL /NTSC
IC 301 3 L A7845 VE R TIC AL D E F L E C T IO N AMP
IC 501 4 TD A6108 R G B D R IVE AMP
IC 601 5TD A7297 S O U ND AMP (10W/C H )
TD A7266S SO U ND AMP (5W/C H )
IC 701 6 TD A9859 AU D IO P R O C E S S O R
IC 801 7 KA3S 1265R SMP S IC (12A)
IC 802 8 P C 123Y P H O TO C O U P L E R
IC 803 9 78R 05 S WITC H ING R E G U L ATO R
IC 804 10 K A7630 SWITC H ING R E G U L ATO R (5,8V )
IC 901 11 S ZM503AT MIC O M
IC 902 12 24C 040 E E P R O M
IC E 01 13 4558 EW D R IV E AMP
IC N01 14 TD A9808 SIF D E TE C TO R NIC AMMO D U L EIC N02 15 TD A9874H NIC AM D E MO D U L ATO R
IC A01 16 L A7567N SIF D E TE C TO R A2 S TE R E OMO D U L EIC A02 17 TD A9873H A2 D E MO D U L ATO R
IC M01 18 L A7566 SIF & FM D E TE C TO R MO NO
IC P 01 19 TE A5114 V ID E O SWITC HPIP
MO D U L EIC P 02 20 TD A9160A P AL /NTSC D E C O D E R
IC P 03 21 S D A9288 PIP V ID E O P R O C E SS
IC T01 22 S AA5261 TTX -D E C O D E R TTXMO D U L EIC T02 23 24C 02 E E P R O M(TTX P AG E ME MO R Y)
1. After removing the 7 screws, pull the cabinet backwards.
3-2 Main Board Removal
Disassembly and reassembly
3-2 Samsung Electronics
1
2
3
4
5
6
7
8
910
11
12
13
1. Separate the TBC-wire 2P connector from GT501,GT502.
2. Separate the CRT Assay from the CRT socket.
3. Remove the Anode Cap from the CRT.
4. Separate the D-Coil Connector from CN802.
5. Separate the AC cord from CN801.
6. Separate the DC connector from CN401.
7. Separate the CN501B 8P CRT connector from CN501.
8. Separate the CNA05 5P A/V side connector from CN602.
9. Separate the CNA01 8P CRT connector from CN701.
10. Separate the Focus,Screen Wire from the FBT clamper.
11. Separate the TBC wire 2P, speaker wires from the wire clamper.
12. Separate the CN701, CN602 connector from the wire clamper.
13. Separate the AC cord from the wire clamper.
14. Remove the main board by pulling it with both hands.
3-3 Speaker Removal
Disassembly and reassembly
Samsung Electronics 3-3
7
1. Remove the speaker bypressing the tension rib.
1. Separate the speaker wires from D-coil(located on the bottom to the right side).
2. Remove the screws.
Disassembly and reassembly
3-4 Samsung Electronics
3-4 CRT Removal
1. Remove the 4 nuts mounting the CRT to the front cabinet. Pull the CRT backwards.
2. Caution: Because of the high vacuum and large surface area of the picturetube, be careful while handling it: (1) Always lift the picture tube bygrasping it firmly around the faceplate, (2) Never lift the tube by its neck.(3) Do not scratch the picture tube or apply excessive pressure. Fracturesof the glass may cause an implosion.
Alignment and Adjustments
Samsung Electronics 4-1
4. Alignment and Adjustments
4-1 Preadjustment
4-1-1 Factory Mode
1. Do not attempt these adjustments in the VideoMode.
2. The Factory Mode adjustments are necessarywhen either the EEPROM (IC902) or the CRTis replaced.
3. Do not tamper with the ÒAdjustmentÓ screenof the Factory Mode menu. This screen isintended only for factory use.
4-1-2 When EEPROM (IC902) Is Replaced
1. When IC902 is replaced all adjustment datarevert to initial values. It is necessary tore-program this data.
2. After IC902 is replaced, warm up the TV for10 seconds.
4-1-3 When CRT Is Replaced
1. Make the following adjustments AFTER set-ting up after setting up purity and conver-gence :
White Balance Sub-Brightness, Sub-Contrast Vertical Center Vertical SizeHorizontal Size Fail Safe (This adjustment must be the laststep).
4-2 Factory/Service Mode
4-2-1 Procedure for the “Adjustment” Mode
1. This mode uses the standard remote control.The Service Mode is activated by entering thefollowing remote-control sequence :
(1) STAND-BY® DISPLAY® MENU® MUTE®POWER ON.
2. The ÒSERVICE (FACTORY)Ó message will bedisplayed. The Service Mode has four compo-nents: Adjustment, Test Pattern, Option Bytesand Reset.
3. Access the Adjustment Mode by pressing theÒVOLUMEÓ keys ( Up or Down). The adjust-ment parameters are listed in the accompany-ing table, and selected by pressing the CHAN-NEL keys ( ,).
4. Selection sequences for the PAL/NTSC system:
DOWN or UP key:
AGC↔VCO↔SBT↔SCT↔SCR↔SC↔RG↔
BG↔CDL↔STT↔PDL↔VOL↔PSL↔PVS↔
PVA↔PHS↔PEW↔PEP↔PEC↔PET↔VSC↔
TSC↔SA↔QEW↔PCT↔PTT↔PHM↔PVP↔
NVP↔PHP↔NSR↔FFI↔AGC.
5. The VOLUME keys increase or decrease theadjustment values (stored in the non-volatile memory) when Adjustment Modeis cancelled.
6. Cancel the Adjustment Mode by re-pressingthe ÒHIDDENÓ or ÒPower OFF/ONÓ keys.
4-2-2 Main Adjustment Parameters
Alignment and Adjustments
4-2 Samsung Electronics
OSD FUNCTION RANGE
AGC AUTO GAIN CONTROL 0 ~ 63
VC O VOLTAGE CONTROLLED OSCILLATOR 0 ~127
SBT SUB BRIGHT 0 ~ 23
SCT SUB CONTRAST 0 ~ 23
SC R SUB COLOR 0 ~ 23
SC S-CORRECTION 0 ~ 63
RG RED DRIVE GAIN 0 ~ 63
BG BLUE DRIVE GAIN 0 ~ 63
C DL CATHODE DRIVE LEVEL 0 ~ 7
STT SUB TINT 0 ~ 13
PDL PAL DELAYTIME 0 ~ 15
VOL VOLUME LEVEL 0 ~100
PSL PAL VERTICAL SLOP 0 ~ 63
PVS PAL VERTICAL SHIFT 0 ~ 63
PVA PAL VERTICAL AMPLITUDE 0 ~ 63
P HS PAL HORIZONTAL SHIFT 0 ~ 63
P EW PAL EW-WIDTH 0 ~ 63
PEP PAL EW-PARABOLA 0 ~ 63
P E C PAL EW-CORNER PARABOLA 0 ~ 63
PET PAL EW-TRAPEZIUM 0 ~ 63
VSC VERTICAL SCROLL 0 ~ 63
TSC TTX SUB CONTRAST 0 ~ 63
SA SEPARATION ADJUSTMENT 0 ~ 14
QEW Q EW-WIDTH 0 ~ 15
PCT CONTRAST 0 ~ 15
PTT PIP TINT 0 ~ 63
P HM HORIZENTAL MOVE 0 ~ 15
PVP PAL VERTICAL POSITION 0 ~63
NVP NTSC VERTICAL POSITION 0 ~ 63
P HP HORIZENTAL POSITION 0 ~ 63
NSR NTSC SUB COLOR 0 ~ 23
FFI FAST FILTER IF-PLL 0 ~ 1
PIP
PIP
PIP
PIP
PIP
Alignment and Adjustments
Samsung Electronics 4-3
4-2-3 Test Pattern
1. This mode can be used during servicing, or for confirming that the convergence and purity adjustmentsare correct.
2. Access the Test Pattern parameters by pressing a CHANNEL keys ( ,) while the Service Mode is on.The cursor will move to the test pattern. Press the VOLUME keys. On-screen display:
• RED• GREEN • BLUE• WHITE
3. AGING Mode (Reference Only)
This pattern is used for pre-heating the CRT during manufacturing--it is accessed in the factory bytwice pressing the ÒHIDDEN Ò key.
Even if the TV power is cut off, the Aging Mode is not cancelled, The AGING mode is cancelled byrepressing the ÒHIDDENÓ or any key on the front pannel.
2 (C H ) P D L 0 (F IXE D ) TSC 40
AG C 18 (F IXE D ) V O L 25 (F IXE D ) SA 25(F IX E D )
V C O 80 (F IXE D ) P S L 31 (F IXE D ) Q E W 5
SBT 7 P V S 31 PCT 7(F IX E D )
SCT 16 P V A 31 PTT 31(F IX E D )
S C R 5 (F IXE D ) P H S 40 P H M 8(F IX E D )
SC 11 (F IXE D ) P E W 38 P VP 31(F IX E D )
RG 31 P E P 22 NVP 31(F IX E D )
BG 31 P E C 22 P H P 42(F IX E D )
C D L 7 (F IXE D ) PET 30 NSR 3(F IX E D )
STT 10 (F IXE D ) V SC 31 (F IXE D ) FFI 1:INDIA,0:OTHERS
OSD INITIAL OSD OSDINITIAL INITIAL
FACTORY MODE VALUE
Alignment and Adjustments
4-4 Samsung Electronics
4-2-4 Option Byte Table
O P T IO N O S D NO T E
SY STE M
CS MU L TI S YS TE M
C S-C H INA WITH O U T S E C AM SY S TE M
C B / CII P AL -B /G & P AL -I
C K / CX P AL /SEC AM B/G ,D /K
NO R MAL / ZOOM / 16 :9
S E L E C T A MO D E AV AIL AB L E TOAD JU S T P -S IZE
P L U S /ZOOM
NO R MAL /ZOOM
P L U S / NORMAL
PLUS / NORMAL/ ZOOM / 16:9
PIPON PIP U SE D
O F F PIP D E L E TE D
JAC KSC AR T 21P IN JAC K U SE D
R C A R C A JAC K U S E D
AU D IO
NIC AM NIC AM MO D U L E U S E D
S TE R E O A2 MO D U L E U S E D
L -S TE R E O MO NO & L INE STE R E O U SE D
MO NO MO NO U S E D
O NE C H IPTD A8844 C R T (MO R E TH AN 22-INC H ) U S E D
MU L TIE NG L ISH / AR AB IAN / P E R SIAN / F R E NC H/ C H INE S E / IND O NE SIAN / MAL AYS IAN/ THAI/ V IE TNAM
TE XTON TTX U S E D
OFF TTX D E L E TE D
X -P R O TON X -R AY P R O TE C TO R U SE D
OFF NO X-R AY P R O TE C TO R F U NC T IO N
S -SY S TE M
B/G 1.TH E SO U ND SY STE M C O ME S F IR S TIN AU TO S E AR C H
2.SO U ND SY STE M IN F AC TO R Y MO D ER E S E T
3."AU TO " MO D E IS S H O WN O NL Y WH E NL -STE R E O OR MO NO IS SE L E C TE D IN THEAU D IO MO D E .
I
D/K
M
AU TO
ENGLISH
Alignment and Adjustments
4-6 Samsung Electronics
4-3 Other Adjustments
4-3-1 General
1. Usually, a color TV needs only slight touch-up adjustment upon installation. Check thebasic characteristics such as height, horizontaland vertical sync and focus.
2. The picture should have good black and whitedetails. There should be no objectionablecolor shading; if color shading is present, per-form the purity and convergence adjustmentsdescribed below.
3. Use the specified test equipment or its equiva-lent.
4. Correct impedance matching is essential.
5. Avoid overload. Excessive signal from a sweepgenerator might overload the front-end of theTV. When inserting signal markers, do notallow the marker generator to distort testresults.
6. Connect the TV only to an AC power sourcewith voltage and frequency as specified on thebackcover nameplate.
7. Do not attempt to connect or disconnect anywires while the TV is turned on. Make surethat the power cord is disconnected beforereplacing any parts.
8. To protect against shock hazard, use an isola-tion transformer.
4-3-2 Automatic Degaussing
A degaussing coil is mounted around the pic-ture tube, so that external degaussing aftermoving the TV should be unnecessary. Butthe receiver must be properly degaussed uponinstallation.
The degaussing coil operates for about 1 sec-ond after the power is switched ON. If the sethas been moved or turned in a different direc-tion, disconnect its AC power for at least 30minutes.
If the chassis or parts of the cabinet becomemagnetized, poor color purity will result. Ifthis happens, use an external degaussing coil.Slowly move the degaussing coil around thefaceplate of the picture tube and the sides andfront of the receiver. Slowly withdraw the coilto a distance of about 6 feet before removingpower.
4-2-5 RESET
The Reset Mode is used during factory inspection. Function Reset:
1. Channels Add/Erase2. Language Basic (English)
Alignment and Adjustments
Samsung Electronics 4-7
4-3-3 High Voltage Check
CAUTION: There is no high voltage adjustment on this chassis.The B+ power supply must be set to +130 volts (Full color bar inputand normal picture level).
1. Connect a digital voltmeter to the secondanode of the picture tube.
2. Turn on the TV. Set the Brightness andContrast controls to minimum (zero beam cur-rent).
3. The high voltage should not exceed 33KV.
4. Adjust the Brightness and contrast controls toboth extremes. Ensure that the high voltagedoes not exceed 33KV under any conditions.
4-3-4 FOCUS Adjustment
1. Input a black and white signal.
2. Adjust the tuning control for the clearestpicture.
3. Adjust the FOCUS control for well definedscanning lines in the center area of the screen.
2. Input a gray scale pattern. (Use a patterngenerator, PM5518)
3. Use the Picture mode for the STANDARD pic-ture.
4. Adjust the Screen VR (on the FBT) so that thevoltage on the oscilloscope becomes 130+2.5V(See Fig. 4-1).
4-3-6 Purity Adjustment
1. Warm up the receiver for at least 20 minutes.
2. Plug in the CRT deflection yoke and tightenthe clamp screw.
3. Plug the convergence yoke into the CRT andset in as shown in Fig. 4-2.
4. Input a black and white signal.
5. Fully demagnetize the receiver by applying anexternal degaussing coil.
6. Turn the CONTRAST and BRIGHTNESS con-trols to maximum.
7. Loosen the clamp screw holding the yoke.Slide the yoke backward or forward to pro-vide vertical green belt. (Fig. 4-3).
8. Tighten the convergence yoke.
9. Slowly move the deflection yoke forward,and adjust for the best overall green screen.
10. Temporarily tighten the deflection yoke.
11. Produce blue and red rasters by adjusting thelow-light controls. Check for good purity ineach field.
12. Tighten the deflection yoke.
Fig. 4-1
130 2.5V+_
GND
_
Alignment and Adjustments
4-8 Samsung Electronics
4-3-7 White Balance Adjustment
Fig. 4-2 Convergence Magnet Assembly
4 Pole Magnet
6 Pole Magnet 2 Pole Magnet
ClamperScrew
2 POLEPURITY
YOKECLAMPSCREW
6 POLECONVERGENCE
4 POLECONVERGENCE
Fig. 4-3 Center Convergence Adjustment
31m/m
Vertical Green Belt
Fig. 4-4
1
2
(a) Set up
1. Warm up the TV for at least 30 minutes in theWhite Pattern.
2. Input a Toshiba pattern.
(b) High-Light Adjustment
Set SCT to 50 ± 5 fL in the Factory Service Mode with using CA100. (See Fig. 4-4 ①)
(c) Low-Light Adjustment
Set SBT to 1.2 ± 0.2 fL in the Factory Service Mode with using CA100. (See Fig. 4-4 ➁)
Alignment and Adjustments
Samsung Electronics 4-9
4-3-8 Center Convergence Adjustment
1. Warm up the receiver for at least 20 minutes.
2. Adjust the two tabs of the 4 pole magnets tochange the angle between them. Superimposethe red and blue vertical lines in the centerarea of the screen.
3. Adjust the Brightness and Contrast controlsfor a well defined picture.
4. Adjust the two-tab pairs of the 4 pole mag-nets, and change the angle between them.Superimpose the red and the blue verticallines in the center area of the screen.
5. Turn the both tabs at the same time, keepingthe angle constant, and superimpose the redand blue horizontal line in the center of thescreen.
6. Adjust the two-tab pairs of the 6-pole magnetsto superimpose the red and blue line onto thegreen. (Changing the angle affects the verticallines, and rotating both magnets affects thehorizontal lines.)
7. Repeat adjustments 2~6, if necessary.
8. Since the 4-pole magnets and 6-pole magnetsinteract, the dot movement is complex(Fig. 4-5).
Fig. 4-5 Center Convergence Adjustment
REDBLUE
BLUE
RED
4-Pole Magnet Movement
GREENRED/BLUE
RED/BLUE
GREEN
6-Pole Magnet Movement
4-3-9 RF AGC Adjustment
1. Tune to the strongest local station.
2. Enter the Factory Service Mode to make adjustments.
3. Adjust the AGC control untill noise(snow) disappears from the screen.
Alignment and Adjustments
4-10 Samsung Electronics
4-3-10 Geometry Adjustment
1. Inp u t a lio n head pattern.
2. Adju s t P V S s o that the p ic tu re is v er tic a lly c en tered .
3. Adju s t with P V A s o that the top and bottom m argin s of the p ic tu re a re 4 .
4. Adju s t P H S s o tha t the p ic ture is ho r iz on ta lly c en tered .
5. Adju s t with P E W s o that the le ft and r ig h t m argin s of the p ic tu re a re 5 .
6. Inpu t a crossha tch patte rn.
7. Adju s t P E P , P E C , P E T for vertica l linearity .
4
4
5 5
Troubleshooting
Samsung Electronics 5-1
5. Troubleshooting
5-1 No Video (Raster On, No Sound)
Yes
No
Check/ReplaceTU101, HC101
NoMeasure theVoltage of each of, 8 pins
of TU101
Check IC901 Pins 39, 40
See "No Video"(Sound OK)
See "No Sound"(Video OK)
Check/ReplaceIC901,IC201,IC902 ,IC701,
Audio Module
Yes
5-2 No Power
Troubleshooting
5-2 Samsung Electronics
Yes
No
No
Yes
No
No
No
Check the 130V,12.7V B+ Lines
Check IC804 Pin 9 (5V)
Check/ReplaceIC801, D802
Check/ReplaceIC804(KA7630),DZ905,DZ804
Check IC901 Pin 18 ; Stand-by : 0V
Normal : 5V
Check/ReplaceIC901
Check IC901Pin 8 (4V).
Check/ReplaceIC901(m-com)
Check IC201,Pin 40 (H-out)
Check/ReplaceIC201, Q402, Q403
NoCheck Q402, Q403
Check/ReplaceDZ805, IC802
Yes
Yes
Yes
5-3 No Video (Sound OK)
Troubleshooting
Samsung Electronics 5-3
Yes
No
No
Yes
No
No
Check IC201 Pin 6 (CVBS)
Check/ReplaceIC201
Check IC201Pins 19, 20, 21(R/G/B-OUT)
Check IC202pin 27 (Y-IN)
Check/ReplaceIC201,D205,DZ204
Check IC501,on the CRT PCB
Check/ReplaceIC501
Check/ReplaceR505 (HEATER 6.3Vrms)
CRT, V999
Yes
NoCheck IC201 Pin 12,37 (8V)
Check/ReplaceIC804 KA7630
Yes
Yes
2Vp-p
Troubleshooting
5-4 Samsung Electronics
5-4 No Sound (Video OK)
No
No
CHECK/REPLACEA/V Front Assembly.
CHECK IC701Pin 3,5
CHECK/REPLACESound Module (MD701)
CHECK/REPLACEIC701, C712, C719
CHECK IC601 Pin
Sound output
CHECK/REPLACEIC601, R601, R602
CHECK IC701Pin 15,18
Yes
Yes
No
Yes
1 14 152
5-5 Power OFF/ON (Repeatedly)
CHECK Q403COLLECTOR H-PULSE SEE " NO-POWER"
NO
YES
CHECK IC901PIN26(H-SYNC )
CHECK/REPLACEIC901,Q907,C913DZ402
NO
YES
CHECK IC301PIN7(V-BLANK)
CHECK/REPLACEQ301,Q302,D304
YES
NO
CHECK PIN6(+16.5V)PIN1(-14V)
CHECK/REPLACER409,R413,D407,D410DZ302,DZ303
NO
YES
CHECK/REPLACEIC301,IC201
Troubleshooting
Samsung Electronics 5-5
5-6 SMPS (Power Supply) Does Not Function
(1) When F 802 is open :C heck/Replace F 802 , IC 801 , D 802.
(2) When F 802 is okay, but SMP S does not function:C heck/Replace D Z801 , D Z808 , IC 802 , D Z805 .