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LG RT-29FB70RB Service Manual

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COLOR TV

SERVICE MANUAL

CHASSIS : MC-022A
MODEL:RT-29FB70RB/RE/RQ/RX
MODEL:RT-29FB70V/VE/VQ/VT
MODEL:RT-25FB700PX
MODEL:RT-25FB70V/VE/VQ
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
website:http://biz.LGservice.com
e-mail:http://www.LGEservice.com/techsup.html

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  Summary of Contents for LG RT-29FB70RB

  • Page 1: Service Manual

    COLOR TV SERVICE MANUAL CHASSIS : MC-022A MODEL:RT-29FB70RB/RE/RQ/RX MODEL:RT-29FB70V/VE/VQ/VT MODEL:RT-25FB700PX MODEL:RT-25FB70V/VE/VQ 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 DESCRIPTION OF CONTROLS .............. 5 ADJUSTMENT ...................8 BLOCK DIAGRAM ...................15 TROUBLE SHOOTING ................17 EXPLODED VIEW .................. 22 EXPLODED VIEW PARTS LIST ..............23 REPLACEMENT PARTS LIST ............... 24 - 2 -...
  • 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: Description Of Controls

    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 MUTE displays the programme table. 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...
  • Page 7 RF/RT-25/29CA40 series 1. MAIN POWER MENU switches the set on or off. ON/OFF 2. POWER/STANDBY INDICATOR illuminates brightly when the set is in standby mode. dims when the set is switched on. 3. MENU CF/CT-25/29M30 series selects a menu. 4. OK TV/AV accepts your selection or displays the ON/OFF...
  • Page 8: Adjustment

    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 9 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 10 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 11 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 12 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 13 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 14 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...
  • Page 15: Block Diagram

    BLOCK DIAGRAM - 15 -...
  • Page 16 - 16 -...
  • Page 17: 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 18 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 19 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 20 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...
  • Page 21 MEMO - 21 -...
  • Page 22: Exploded View

    EXPLODED VIEW - 22 -...
  • Page 23: Exploded View Parts List

    BACK COVER ASSEMBLY,RT-21FB70RB 2PHONE NON 3809V00430A BACK COVER ASSEMBLY,RT-29FB70 2PHONE LGESY-LOCAL 6871VSMB26M PWB(PCB) ASSEMBLY,SUB,CPT MC022A 6871VSMD76A 6871VSMD76A PWB(PCB) ASSEMBLY,SUB CPT 022A (CPT/VM)SY CKD 25” LG 6871VSMN22B PWB(PCB) ASSEMBLY,SUB CPT MC022A 29” LG FLAT (MT-CKD) 6871VMMD40R 6871VMMN10L PWB(PCB) ASSEMBLY,MAIN MC022A 6871VMMR07B PWB(PCB) ASSEMBLY,MAIN MC022A RT-29FB70VQ.AFLLKP...
  • Page 24: Replacement Parts List

    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 REPLACEMENT PARTS LIST follows;...
  • 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 TRANSFORMER,SMPS[COIL]EER5345 340UH 115V 0RD3301F609 3.3K OHM 1/6 W 5.00% TA52 CONNECTOR 0RD1002F609 10K OHM 1/6 W 5% TA52 366-932B 2.5MM 3P GIL-G LG CABLE S (STICK) 0RD2001F609 2K OHM 1/6 W 5% TA52 366-921J 0RD2001F609 2K OHM 1/6 W 5% TA52 P03A 2.5MM 10P GIL-G LG CABLE .
  • 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 29 180-822M RWR 15W 1.0 OHM J PD 10 OHM 1/2 W 5.00% TA52 SW1101 R803 0RD0102H609 140-315A TACT SKHV17910B LG C&D NON 12V R804 0RD4701F609 4.7K OHM 1/6 W 5% TA52 SW1102 140-315A TACT SKHV17910B LG C&D NON 12V 1K OHM 1/6 W 5% TA52...
  • Page 31 PRINTED CIRCUIT BOARD COMPONENT LOCATION GUIDE C417 ..G4 C819 ..D3 FR301 ..E5 J105 ..A5 J629 ..B4 P401A..G4 R201 ..C1 R550 ..E5 TP2 ..C2 C427 ..G4 C820 ..G3 FR401 ..E5 J106 ..C5 J630 ..B4 P401B ..F4 R202 ..B1 R555 ..C3 TP3 ..C2 MAIN C501 ..C4 C821 ..G3...
  • Page 32 Mar.,2004 P/NO : 3828VD0128F Printed in Korea...