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LG RF-21FA20 Service Manual
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LG RF-21FA20 Service Manual

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COLOR TV
SERVICE MANUAL
CHASSIS : MC-014A
MODEL:RF-21FA20/Q/PQ
MODEL:CF-21Q20EH
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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  • Page 1 All manuals and user guides at all-guides.com website:http://biz.LGservice.com e-mail:http://www.LGEservice.com/techsup.html COLOR TV SERVICE MANUAL CHASSIS : MC-014A MODEL:RF-21FA20/Q/PQ MODEL:CF-21Q20EH CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Table Of Contents

    All manuals and user guides at all-guides.com CONTENTS Contents ......................... 2 Safety Precautions ....................3 Specifications ..................... 4 Control Descriptions ..................5 Disassembly Instructions ................8 Adjustment Instructions ................9 T rouble Shooting ....................12 Exploded View .................... 16,18 Exploded View Parts List ................17,19 Replacement Parts List ................

  • Page 3: Safety Precautions

    All manuals and user guides at all-guides.com 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

    All manuals and user guides at all-guides.com SPECIFICATIONS Note : Specification and others are subject to change without notice for improvement. Video input system: SOUND IF : 33.4MHz (B/G) PAL-B/G, D/K, I/I 32.9MHz (I/I) SECAM-B/G, D/K 32.4MHz (D/K) NTSC 4.43(AV) Power requirement : 110~240V, 50/60Hz Intermediate Frequency (Unit : MHz) VISION IF : 38.9MHz...

  • Page 5: Control Descriptions

    PLAY STOP P/STILL 9. PSM (Picture Status Memory) recalls your preferred picture setting. 10. SSM (Sound Status Memory) recalls your preferred sound setting. 11. VCR BUTTONS (option) control a LG video cassette recorder. (With / Without PIP) - 5 -...
  • Page 6 All manuals and user guides at all-guides.com 12. I/II selects the language during dual language broadcast (option). selects the sound output. 13. LIST displays the programme table. 14. PIP BUTTONS (option) PIP/ switches the sub picture on or off. PR +/- selects a programme for the sub picture.
  • Page 7 TV/AV VIDEO L/MONO AUDIO POWER AV 2 5 6 8 RF-21FA20 series MENU ON/Off 1. MAIN POWER switches the set on or off. 2. POWER/STANDBY INDICATOR illuminates brightly when the set is in standby mode. dims when the set is switched on.

  • Page 8: Disassembly Instructions

    All manuals and user guides at all-guides.com 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

    All manuals and user guides at all-guides.com ADJUSTMENT INSTRUCTIONS Safety Precautions 1. It is safe to adjust after using insulating transformer between the power supply line and chassis input to prevent the risk of electric shock and protect the instrument. 2.
  • Page 10 6) Adjust High Light status of RG and BG with VOL+ or VOL- at CG:370 until X=268!8,Y=273!8. 7) Repeat above step 5) and 6) until each status of High Light and Low Light. LOW LIGHT HIGH LIGHT 4.5 ! 1 FL 43 ! 1 FL LG 21” FLAT - 10 -...
  • Page 11 All manuals and user guides at all-guides.com OPTION Adjustment 1.OPTION 1 Function 3.OPTION 3 Function Remark Option Code Function Option Code Function Remark NO 200PR Option Rear AV2 Option NO YUV/W 200PR YUV/W With 200PR Option YUV/S-WOOFER China+Australia Option CC GAME Except China &...

  • Page 12: T Rouble Shooting

    All manuals and user guides at all-guides.com T rouble Shooting No Power ON(SMPS working) Check pin31 of IC01 High Low(=0V) Check the voltage at Check & Replace pin 54 of IC01. Q05, IC851, IC802(3), IC856 3.3V Check & Replace Check & Replace Check the H-Out voltage IC853(3), FR406, IC01,FR403,R413,...
  • Page 13 All manuals and user guides at all-guides.com Check the heater element Check the Heater voltage 6.0~6.4Vrms Check & Replace Increase the screen FR401 Voltage of FBT Normal Check & Replace Retrace line Screen is Black is visible Check the waveform Check FBT &...
  • Page 14 All manuals and user guides at all-guides.com No Sound(Picture OK) Check the voltage at pin10 of IC601(Sound Amp) Check & Replace Check the waveform F851,FB853,D850 at pin24,25 of ICN01 Check the voltage Check the waveform at pin8 of IC601 at pin47 of ICN01 Check &...
  • Page 15 All manuals and user guides at all-guides.com Don t Catch Channel Check the voltage at pin9 of Tuner(33V) Check & Replace Check the voltage at F854,D861,R103,ZD101 pin7 of Tuner(5V) Check the waveform at Check & Replace pin14 of IC141(CVBS) L102,Tuner Check &...

  • Page 16: Exploded View

    All manuals and user guides at all-guides.com EXPLODED VIEW:21FA20 P801 - 16 -...

  • Page 17: Exploded View Parts List

    All manuals and user guides at all-guides.com The components identified by mark critical for safety. EXPLODED VIEW PARTS LIST Replace only with part number specified. LOCA. NO PART NO DESCRIPTIONS 343-B52A SUPPORTER,PCB 2426GDB30AI CPT SET,A51QDJ279X 17K7NI 2426GDB30AZ CPT SET,A51QDJ279X 00M7NI 120-C77G SPEAKER,GENERAL C122P02K1459 8 OHM 1 6401VA0011B...
  • Page 18 All manuals and user guides at all-guides.com EXPLODED VIEW:21Q20 P801 - 18 -...
  • Page 19 All manuals and user guides at all-guides.com The components identified by mark critical for safety. EXPLODED VIEW PARTS LIST Replace only with part number specified. LOCA. NO PART NO DESCRIPTIONS 2426GDB3804 CPT SET,A51QDJ279X 17K7NI 120-D38C SPEAKER,8 OHM 15/25W 6401VA0011B SPEAKER ASSY,WOOFER 120-D18C SPEAKER,WOOFER C100R54K1452 8 OHM 20/3 150-D02X...

  • Page 20: Replacement Parts List

    All manuals and user guides at all-guides.com The components identified by mark critical for safety. REPLACEMENT PARTS LIST Replace only with part number specified. LOCA. NO PART NO DESCRIPTION LOCA. NO PART NO DESCRIPTION D858 0DD200009AH DIODE,RECTIFIER RU2AMV(1) TP D861 0DD060009AC DIODE,TVR06J 0.6A/600V 250NS HIC01...
  • Page 21 All manuals and user guides at all-guides.com For Capacitor & Resistors, CC, CX, CK, CN : Ceramic RD : Carbon Film The components identified by mark the charactors at 2nd and 3rd CQ : Polyestor RS : Metal Oxide Film critical for safety.
  • Page 22 All manuals and user guides at all-guides.com For Capacitor & Resistors, CC, CX, CK, CN : Ceramic RD : Carbon Film The components identified by mark the charactors at 2nd and 3rd CQ : Polyestor RS : Metal Oxide Film critical for safety.
  • Page 23 All manuals and user guides at all-guides.com For Capacitor & Resistors, CC, CX, CK, CN : Ceramic RD : Carbon Film The components identified by mark the charactors at 2nd and 3rd CQ : Polyestor RS : Metal Oxide Film critical for safety.
  • Page 24 All manuals and user guides at all-guides.com The components identified by mark For Capacitor & Resistors, CC, CX, CK, CN : Ceramic RD : Carbon Film the charactors at 2nd and 3rd CQ : Polyestor RS : Metal Oxide Film critical for safety.
  • Page 25 All manuals and user guides at all-guides.com For Capacitor & Resistors, CC, CX, CK, CN : Ceramic RD : Carbon Film The components identified by mark the charactors at 2nd and 3rd CQ : Polyestor RS : Metal Oxide Film critical for safety.
  • Page 26 0RD2403F609 240K OHM 1/6 W 5.00% TA52 R1650 0RD0331F609 3.3 OHM 1/6 W 5.00% TA52 SW01 140-315A SWITCH,TACT SKHV17910B LG C&D NON 12V R1651 0RD0331F609 3.3 OHM 1/6 W 5.00% TA52 SW02 140-315A SWITCH,TACT SKHV17910B LG C&D NON 12V R1652 0RD1000F609 100 OHM 1/6 W 5.00% TA52...
  • Page 27 All manuals and user guides at all-guides.com P/N : 3854VA0087A-S1(1/2) Date : 2001.03.19...
  • Page 28 All manuals and user guides at all-guides.com PRINTED CIRCUIT BOARD COMPONENT LOCATION GUIDE P/N: 3854VA0087A-S1(2/2) DATE: 2001.03.19 C01 ..B2 C501 ..C3 D408 ..E5 J18 ...B2 J105 ..D1 JP44..D5 Q01 ..D1 R201 ..D5 R542 ..C2 TP12 ..B4 C02 ..B2 C503 ..B3 D410 ..G3 J19 ...B1 J106 ..D4...

  • Page 29: Svc. Sheet

    All manuals and user guides at all-guides.com SVC. SHEET:3854V A0087A-S1...
  • Page 30 All manuals and user guides at all-guides.com Mar.,2001 P/NO : 3828VD0070E...

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