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Table of Contents
Related Manuals for LG CT-25Q40RQ
Summary of Contents for LG CT-25Q40RQ
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Page 1: Service Manual
COLOR TV SERVICE MANUAL CHASSIS : MC-022A MODEL:CT-25Q40RQ/VB/VE/VQ MODEL:CT-29Q40RE/RQ/VB/VE/VQ MODEL:CF-29F84V CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. -
Page 2: Table Of Contents
CONTENTS Contents ......................... 2 Safety Precautions ....................3 Specifications ..................... 4 Control Descriptions ..................5 Disassembly Instructions ................8 Adjustment Instructions ................9 Block Diagram ....................16 T rouble Shooting ....................18 Exploded View ....................22 Exploded View Parts List ................23 Replacement Parts List ................ -
Page 3: Safety Precautions
SAFETY PRECAUTIONS IMPORT ANT SAFETY NOTICE Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by 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. -
Page 4: Specifications
SPECIFICA TIONS Note : Specification and others are subject to change without notice for improvement. Video input system: PAL-B/G, D/K, I/I SOUND IF : 33.4MHz (B/G) SECAM-B/G, D/K/L/L’ 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 (L’) Intermediate Frequency (Unit : MHz) VISION IF : 38.9MHz,33.9MHz(SECAM-L’) -
Page 5: Control Descriptions
I/II LIST adjusts menu settings. SLEEP EYE/ 6. VCR BUTTONS (option) TEXT Q.VIEW control a LG video cassette recorder. 7. SSM (Sound Status Memory) TIME recalls your preferred sound setting. REVEAL MODE SIZE STILL POSITION 9/4 PIP 8. - Page 6 14. OK accepts your selection or displays the current mode. 15. LIST POWER displays the programme table. MUTE 16. EYE/ (option) switches the eye function on or off. 17. SLEEP sets the sleep timer. TV/AV 18. Q.VIEW returns to the previously viewed programme. MENU SOUND PICTURE...
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Page 7: Front Panel
Front panel CT-25/29Q20 series RT-29FA33 series ON/OFF MENU OK MENU ON/OFF 23 4 5 CT-25/29Q40 series RT-28FZ10 series MENU MENU ON/OFF ON/OFF 1. MAIN POWER 9. +/- ( switches the set on or off. adjusts the function or selects a programme. switches the set on from standby. -
Page 8: Disassembly Instructions
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. -
Page 9: Adjustment Instructions
ADJUSTMENT INSTRUCTIONS 1. Safety Precautions 5. Screen Voltage & White Balance Adjustment 1. It is safe to adjust after using insulating transformer between 5-1. Adjustment of screen manually the power supply line and chassis input to prevent the risk of (Using ADJ.Remote Control) electric shock and protect the instrument. - Page 10 Adjust so that middle portion of the outermost left and right vertical line looks like parallel with vertical lines of the CPT. NOTE : If production line doesn’t the production line of LG TV,receive available deflection adjustment pattern. EC (East-west Coner) Adjust so that the vertical line at every 4 corners of the screen 6-2.
- Page 11 25/29” LG FLAT CPT(CT-25Q20RB) 29” S/S SEB FLAT CPT ITEM Z50Hz ITEM RANGE N50Hz W50Hz RANGE N50Hz Z50Hz W50Hz 0050~00CF 009A 0050~00CF 00A3 0025~00BF 00F3 0025~00BF 00F5 0000~009F 00D0 0000~009F 00D0 0600~0900 0774 0600~0900 0744 0000~003F 0019 0000~003F 0016 0400~0EFF...
- Page 12 00FD 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...
- Page 13 8-3. OPTION 1 Function 8-5. OPTION 3 Function Option Code Function Remark Function Option Code Remark 4:3 NORMAL MODEL TXT Model W/O GAME WIDE GAME WIDE FLAT MODEL W/O TXT Model GAME PACK GAME(HINDI MICOM) W/O TOP(FLOP BASIC) FORCED MONO NOT SETTING MONO WITH TOP FORCED MONO SETTING...
- Page 14 8-7. OPTION 4 Function OPTION CODE FUNTION Arab.Asia English Only(Eng.) 3834 Arab(Eng/Fr/Arab) Urdu(Eng/Fr/Arab/Urdu) Asia(Eng/Fr/Indonesia) Farsi English Only(Eng.) 3834 Arab(Eng/Fr/Arab) Farsi(Eng/Fr/Arab/Farsi) Arab-Asia English Only(Eng.) 3804 Arab(Eng/Fr/Arab) LANG. Urdu(Eng/Fr/Arab/Urdu) Arab all(Eng/Fr/Arab/Urdu/Farsi) Farsi ONly(Eng/Farsi) Asia(Eng/Fr/Indonesia/Malay) WEST-EU English Only(Eng.) 3834 Only(W/TXT) EU-7(E.Ger/Fr/Ita/Spain/Holand/Port) EU-NORTH(E-Ger/Fr/Holand/Swe/Nor/Den/Fin) EAST-EU English Only(Eng.) 3834 Only(W/TXT) Cyrilic(E.Russia)
- Page 15 OPTION CODE FUNTION Farsi only WEST-EU 3834 only(W/TXT) EAST-EU Turkey Cyrillic3 Arab/English Farsi/English TXT-L Arab-Asia WEST-EU 3834 only(W/TXT) EAST-EU Turkey Cyrillic3 Arab/English WEST EU WEST-EU 3834 only(W/TXT) EAST-EU Turkey Cyrillic3 EAST EU WEST-EU 3834 only(W/TXT) EAST-EU Turkey Cyrillic3 28” WIDE FLAT WEST-EU 3834 only(W/TXT) EAST-EU...
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Page 16: Block Diagram
BLOCK DIAGRAM - 16 -... - Page 17 - 17 -...
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Page 18: Trouble Shooting
TROUBLE SHOOTING RF- STEREO Selected correct system In menu Check the waveform Check / Replace At pin 17 of TU101 TU 101 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 Check the waveform Check / Replace... - Page 19 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 Check / Replace Fuse , DB801 Check the In/out of Check pin 24 Check the Voltage IC06, IC07 Of IC01(H - Out) Of C804...
- Page 20 No Picture / No Sound Is any OSD displayed? Check receiving system in MENU Check IC01 pin37,42,43,44 & execute Auto - Program. (IK, R,G,B) Does the auto - Program Operate properly. Check / Replace IC01 Store on manual - program MENU Check Check 5V, 33V &...
- Page 21 AV Stereo Select correct system In menu Check the connection Of AV equipment Check the the waveform At pin47 of IC661 Check TU101 Tuner Check the voltage Check the waveform Of pin16,20 At pin 24, 25, of IC661 Check waveform Check / Replace At pin 4, 12 of IC602 IC602...
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Page 22: Exploded View
EXPLODED VIEW P801 - 22 -... -
Page 23: Exploded View Parts List
BACK COVER ASSY LGEAP 3809V00203G 3809V00188M BACK COVER ASSY(1 SC,1 PH) 3210V00043E 3210V00043E FRAME,MAIN V2 LGESY 6871VSMD76A 6871VSMD76B PWB ASSY,CPT/VM SY CKD 25” LG 6871VMMC19B PWB ASSY,MAIN -Q40RQ 6871VMMD19F PWB ASSY,MAIN -Q40VE 6871VMMC19N PWB ASSY,MAIN -Q40VE LGEIN 6871VMMD19B 6871VMMD19Z PWB ASSY,MAIN -Q40VE... -
Page 24: Replacement Parts List
REPLACEMENT PARTS LIST LOCA. NO PART NO DESCRIPTION LOCA. NO PART NO DESCRIPTION D863 0DS141489AB DIODE,SWITCHING 1N4148 TP GRANDE 20V DIODE,SWITCHING 1N4148 TP GRANDE 20V D864 0DS141489AB HIC920 0IZZVF0018A IC,STK396-110 11P ST SCAN VELOCIT 0DR400009AB DIODE,RECTIFIERS RU4JGF D866 IC01 0ICTMMN004B IC,VCT3834B LG24 W/EU 64P ST TXT D867 0DS141489AB... - Page 25 For Capacitor & Resistors, CC, CX, CK, CN : Ceramic RD : Carbon Film the charactors at 2nd and 3rd CQ : Polyestor RS : Metal Oxide Film digit in the P/No. means as CE : Electrolytic RN : Metal Film follows;...
- Page 26 For Capacitor & Resistors, CC, CX, CK, CN : Ceramic RD : Carbon Film the charactors at 2nd and 3rd CQ : Polyestor RS : Metal Oxide Film digit in the P/No. means as CE : Electrolytic RN : Metal Film follows;...
- Page 27 For Capacitor & Resistors, CC, CX, CK, CN : Ceramic RD : Carbon Film the charactors at 2nd and 3rd CQ : Polyestor RS : Metal Oxide Film digit in the P/No. means as CE : Electrolytic RN : Metal Film follows;...
- Page 28 For Capacitor & Resistors, CC, CX, CK, CN : Ceramic RD : Carbon Film the charactors at 2nd and 3rd CQ : Polyestor RS : Metal Oxide Film digit in the P/No. means as CE : Electrolytic RN : Metal Film follows;...
- Page 29 For Capacitor & Resistors, CC, CX, CK, CN : Ceramic RD : Carbon Film the charactors at 2nd and 3rd CQ : Polyestor RS : Metal Oxide Film digit in the P/No. means as CE : Electrolytic RN : Metal Film follows;...
- Page 30 220 OHM 1/6 W 5.00% TA52 100 OHM 1/6 W 5.00% TA52 RP122 0RD1000F609 SWITCH SWP801 6600VM2002A SWITCH,PUSH SDKEA3 IEC 250V 8A HORIZO SWITCH,TACT 2LEAD 100G(TA) LG C&D NON SW1101 140-313A 140-313A SWITCH,TACT 2LEAD 100G(TA) LG C&D NON SW1102 SW1103 140-313A SWITCH,TACT 2LEAD 100G(TA) LG C&D NON...
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Page 31: Svc. Sheet
SVC. SHEET : 3854V A0098A-S SVC. SHEET :... - Page 32 PRINTED CIRCUIT BOARD COMPONENT LOCATION GUIDE P/N: 3854VA0098A-S(2/2) DATE: 2002.03.25 C01 ..B4 C402 ..G4 C806..F2 F854..E3 G70 ..E2 J160 ..C4 J251 ..D5 J345 ..A3 Q110 ..B5 R140 ..A5 R526 ..C4 R908 ..A1 C02 ..B4 C403 ..G3 C807..F3 F855..D2 G71 ..E2 J161 ..C3 J252 ..D3 J346 ..E2...
- Page 33 P/NO:3854VA0098A-S(1/2) 2002.03.25...
- Page 34 Jan.,2003 P/NO : 3828VD0118A Printed in Korea...