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website:http://biz.LGservice.com
e-mail:http://www.LGEservice.com/techsup.html
COLOR TV
SERVICE MANUAL
CHASSIS : MC-022A
MODEL:CT-25/29M60RE/RX
MODEL:CT-25/29M60VE/VQ
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
Dec.,2002
P/NO : 3828VD0118J Printed in Korea
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CONTENTS Contents ................................................................................................................. 2 Safety Precautions ............................................................................................3 Specifications ..................................................................................................... 4 Control Descriptions ........................................................................................ 5 Disassembly Instructio
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SAFETY PRECAUTIONS IMPORTANT SAFETY NOTICE Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the 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 to prevent X-RADIATION, Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer. General Guidance Befor
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SPECIFICATIONS Note : Specification and others are subject to change without notice for improvement. O Video input system: PAL-B/G, D/K, I/I SOUND IF : 33.4MHz (B/G) SECAM-B/G, D/K/L/LÕ 32.9MHz (I/I) NTSC M 32.4MHz (D/K,L) NTSC 4.43(AV) 34.4MHz (M) NTSC- M/PAL M-N 40.4MHz (LÕ) O Intermediate Frequency (Unit : MHz) VISION IF : 38.9MHz,33.9MHz(SECAM-LÕ) O Power requirement : 110~240V, 50/60Hz(NON-EU) COLOR IF : 34.47MHz(4.43) 230V, 50Hz(EU) 35.32MHz(3.58) : NTSC-M VIF-4.25000MHz O Power cons
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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 front panel of the set. POWER MUTE Remote control handset 11 1 Before you use the remote control handset, please install the bat- 1 2 3 teries. See the next page. 5 6 4 2 1. POWER 7 8 9 switches the set on from standby or off to standby. ARC TV/AV 0 2. NUMBER BUTTONS 12 3 switches the set on from standby or directly select a number. MENU SOUND
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14. OK accepts your selection or displays the current mode. 15. LIST POWER MUTE displays the programme table. 11 1 1 2 3 16. EYE/ (option) * switches the eye function on or off. 4 5 6 2 17. SLEEP 8 9 7 sets the sleep timer. ARC 0 TV/AV 12 18. Q.VIEW 3 MENU returns to the previously viewed programme. SOUND PICTURE 4 selects a favorite programme. 13 OK T U R B O 14 19. PIP BUTTONS (option) ( ) PIP PR VOL VOL switches the sub picture on or off. 5 PR PR +/- ( ) selects a programme for the su
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S-VIDEO VIDEO L/MONO AUDIO R S-VIDEO VIDEO L/MONO AUDIO R Front panel CT-25/29Q20 series RT-29FA33 series ON/OFF MENU OK VOL PR 11 MENU OK VOL PR ON/OFF 1 234 5 6 1112 10 1 34 5 2 6 10 12 CT-25/29Q40 series RT-28FZ10 series MENU OK VOL PR MENU O K VOL PR VOL ON/OFF ON/OFF 11 1 3 5 4 2 6 10 1 2 6 3 4 5 12 1. MAIN POWER 9. +/- ( ) D D/E E switches the set on or off. adjusts the function or selects a programme. switches the set on from standby. 2. POWER/STANDBY INDICATOR illuminates brightly when t
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DISASSEMBLY INSTRUCTIONS Important note Chassis Assy Removal This set is disconnected from the power supply through the Grasp both side of Frame and pull it backward smoothly. converter transformer. An isolating transformer is necessary for service operations on the primary side of the converter transformer. Back Cabinet Removal Remove the screws residing on the back cabinet and carefully separate the back cabinet from the front cabinet. (Fig. 2-1). CPT Removal PICTURE TUBE HANDLING CAUTION Due
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ADJUSTMENT INSTRUCTIONS 1. Safety Precautions 5. Screen Voltage & White Balance Adjustment 1. It is safe to adjust after using insulating transformer between the power supply line and chassis input to prevent the risk of 5-1. Adjustment of screen manually electric shock and protect the instrument. (Using ADJ.Remote Control) 2. Never disconnect leads while the TV receiver is on. 3. Don't short any portion of circuits while power is on. 1) Receive the PAL or SECAM(NTSC) signal into RF mode 4. The
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6. Deflection Data Adjustment (Line SVC-2) EW (Horizontal Width) Adjust to that a digital circle pattern looks like exact circle. NOTE : How to enter into the Line Service Mode with a remocon. 1.Power off. 2.Press the Red button. 3.Press the Green button. 4.Press the Yellow button. 5.Press the Cyan button. 6.Press the OK button. 7.Power On. 6-1. Preparation for Deflection Adjustment 1) At adjustment mode(IN-START button on remote control of adjustment),changed to LINE SVC 2 mode to adjust the de
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25/29Ó LG FLAT CPT(CT-25Q20RB) 29Ó S/S SEB FLAT CPT ITEM ITEM RANGE N50Hz W50Hz Z50Hz RANGE N50Hz W50Hz Z50Hz VA 0050~00CF 009A 22 11 VA 0050~00CF 00A3 -22 11 VL 0025~00BF 00F3 3 0 VL 0025~00BF 00F5 0 0 SC 0000~009F 00D0 0 0 SC 0000~009F 00D0 0 0 VS 0600~0900 0774 0 0 VS 0600~0900 0744 0 0 HS 0000~003F 0019 0 0 HS 0000~003F 0016 0 0 EW 0400~0EFF 0B96 22 0 EW 0400~0EFF 0E40 0 0 ET 0700~08FF 07DE 0 0 ET 0700~08FF 07E9 0 0 EP 06E0~0840 07BF 19 -14 EP 06E0~0840 07B4 22 -14 ES 06A0~0AFF 085C 0 0 ES 0
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16: 9 14: 9 ZOOM STANDARD ITEM RANGE 50Hz 60Hz 50Hz 60Hz 50Hz 60Hz 50Hz 60Hz VA 0050~00CF 0083 0083 008F 008E 00A7 00A7 0083 0084 VL 0025~00BF 00FD 00FA 00FD 00A 00FD 00F8 00FD 00F9 7. SVC Data & PSM,SSM Data. PICTURE SETTING DATA (LINE SVC-3) 28” FLAT Menu Range 25/29” LG Flat 29” S/S-Flat 25” FST 28” FST 29” FST DVCO(Digital VCO) IBRM(BLACK CURRENT) 0~1FFH 00C8 00C8 00C8 00C8 00C8 00C8 WDRM(WHITE CURRENT) 0~3FFH 0190 0190 0190 0190 0190 0190 BCLT(BCL THERSHOLD 0~7FFH 0055 0055 0050 0050 0050
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8-3. OPTION 1 Function 8-5. OPTION 3 Function Option Code Function Remark Option Code Function Remark 0 4:3 NORMAL MODEL 0 TXT Model W/O GAME WIDE GAME 1 WIDE FLAT MODEL W/O TXT Model 1 GAME PACK GAME(HINDI MICOM) 0 W/O TOP(FLOP BASIC) 0 FORCED MONO NOT SETTING TOP MONO 1 WITH TOP 1 FORCED MONO SETTING Only Austrailia 0 Without ACMS funtion 0 WITH 1 AV JACK(BACK) ACMS AV2 1 PAL model ALL With ACMS funtion 1 WITH 2 AV JACK(BACK) 0 ALL NATION 0 1 TUNER Model 1 TUNER Model BOOSTER CONTROL disabl
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8-7. OPTION 4 Function OPTION CODE FUNTION Arab.Asia 0 English Only(Eng.) 3834 1 Arab(Eng/Fr/Arab) 2 Urdu(Eng/Fr/Arab/Urdu) 3 Asia(Eng/Fr/Indonesia) Farsi 0 English Only(Eng.) 3834 1 Arab(Eng/Fr/Arab) 2 Farsi(Eng/Fr/Arab/Farsi) Arab-Asia 0 English Only(Eng.) OSD 3804 1 Arab(Eng/Fr/Arab) LANG. 2 Urdu(Eng/Fr/Arab/Urdu) 3 Arab all(Eng/Fr/Arab/Urdu/Farsi) 4 Farsi ONly(Eng/Farsi) 5 Asia(Eng/Fr/Indonesia/Malay) WEST-EU 0 English Only(Eng.) 3834 Only(W/TXT) 1 EU-7(E.Ger/Fr/Ita/Spain/Holand/Port) 2 EU-
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OPTION CODE FUNTION Farsi only 0 WEST-EU 3834 only(W/TXT) 1 EAST-EU 2 Turkey 3 Cyrillic3 5 Arab/English 8 Farsi/English TXT-L Arab-Asia 0 WEST-EU 3834 only(W/TXT) 1 EAST-EU 2 Turkey 3 Cyrillic3 5 Arab/English WEST EU 0 WEST-EU 3834 only(W/TXT) 1 EAST-EU 2 Turkey 6 Cyrillic3 EAST EU 0 WEST-EU 3834 only(W/TXT) 1 EAST-EU 2 Turkey 6 Cyrillic3 28” WIDE FLAT 0 WEST-EU 3834 only(W/TXT) 1 EAST-EU 2 Turkey 4 Cyrillic3 5 Arab/English 6 Farsi/English - 15 -
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BLOCK DIAGRAM - 16 - AV -1 AV-2 H/P OUT RF OUT MONITOR OUT MAIN SPEAKER MAIN SPEAKER L/R L/R L L R R TU101 TU102 IC602 IC661 TDA 7297 SIF (7266) MSP-34xxG TUNER-2 Sound Amp . Sound Processor FOR PIP TUNER-1 T TO O (W/O PIP MAIN AF(SECAM L) TDA-2066 Cathode Cathode Option) IC901 (Mono Opt.) 0f 0f SELECTED TDA 6109 CPT CPT IC01 Ik CVBS FOR MAIN R/G/B (6107)JF VCT 3801/3804/3834 Main W/O PIP CVBS VM R G B AMP AT24C16 Control Processor W/O PIP AV1,2,3, Y,C EEPROM EW VM VM- -
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- 17 - T803 EYE(Opt.) Relay Tilt(Opt.) ST-BY PRE-AMP TRANS 78L05 ST 5V EEPROM LED 12V SMPS 7805 TRANS IC661 KA78A09 9V 11 12V MSP-34XX (Sound Processor) IC602 ¡ 14V(FBT) LA 7845(V-AMP) LD3.3V T802 TDA-7297 TDA- 2006 Sound AMP (Mono Opt.) 12 5V 278R05 8V VCT3834 SDA-9489X LD3.3V ICP01 LD3.3V IC01 28V(FBT) EW AMP (PIP Processor) 17V 7805 14 Sound Vcc 5V CXA-2040AQ (35V OPT.) PIP & AV SW (Video Switch) Tuner Tuner ICP101 (OPT.) 16 33V H-DRIVE (Main) (Sub) TDA6109 IC901 110V(Flat) 200V(FBT) VM 18
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TROUBLE SHOOTING RF- STEREO Selected correct system In menu OK NO Check the waveform Check / Replace At pin 17 of TU101 TU 101 OK NO NO Check the waveform Check The Voltage Check The voltage At pin 24,25 of IC661 At pin 16,33,46, of IC661 At pin of IC610, IC853 OK NO NO Check the waveform Check / Replace Check / Replace At pin 4,12 of IC602 Q671, 672 IC610, IC853 OK NO Check the Voltage Check / Replace At pin 6, 7 of IC602 Q621, IC603 OK Check the waveform At pin 1, 2, 14, 15 of IC602 OK NO Ch
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NO RASTER CHECK B+ At D807 cathode Normal Abnormal Open Is the voltage at Check Pin 25, 54 of IC01 3.3V? Fuse of AC line No Yes Check / Replace Ok Fuse , DB801 Check the In/out of Check pin 24 Check the Voltage No IC06, IC07 Of IC01(H - Out) Of C804 0V Check & 254~380 V Yes Replace Check / Replace IC01 Fuse DB801 Check Q402 Check the Voltage Collector waveform Pin 3 of IC801 No Check & Yes Replace Check / Replace Q402 IC801, IC803, IC802 Check T401 & each pin voltage No No Yes Che
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No Picture / No Sound Is any OSD displayed? OK No OK OK Check receiving system in MENU Check IC01 pin37,42,43,44 & execute Auto - Program. (IK, R,G,B) No Does the auto - Program Operate properly. Check / Replace OK IC01 Store on manual - program MENU Check No Check 5V, 33V & IIC Bus Line 5V, 33V & Go to Of Tuner. IIC Bus Line No Sound / Picture OK OK No Is the CVBS signal OK. Check / Replace (IC01 pin10 or 22) IC01, Tuner OK OK No Check R,G,B signal Check Check IK At IC01, pin42,43,44 CVB
