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LG RF/RT-20/21CA80VE/VQ/VW Service Manual
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LG RF/RT-20/21CA80VE/VQ/VW Service Manual

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COLOR TV

SERVICE MANUAL

CHASSIS : MC-019A
MODEL : RF/RT-20/21CA80VE/VQ/VW
MODEL :
RF/RT-14/21CA80M/MX
MODEL :
CF-21CA810EX/RF-21CB90VQ
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 RF/RT-20/21CA80VE/VQ/VW

  • Page 1: Service Manual

    COLOR TV SERVICE MANUAL CHASSIS : MC-019A MODEL : RF/RT-20/21CA80VE/VQ/VW MODEL : RF/RT-14/21CA80M/MX MODEL : CF-21CA810EX/RF-21CB90VQ CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Table Of Contents

    CONTENTS Contents ......................... 2 Safety Precautions ....................3 Servicing Precautions ..................4 Specifications ..................... 6 Description of Controls .................. 7 Disassembly Instructions ................10 Adjustment ......................11 Purity & Convergence Adjustment ............14 Block Diagram ......................17 Exploded View .................... 18,20 Exploded View Parts List ................19,21 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: Servicing Precautions

    SERVICING PRECAUTIONS CAUTION: Before servicing receivers covered by this service transistors and semicounductor "chip" components. The manual and its supplements and addenda, read and follow the following techniques should be used to help reduce the SAFETY PRECAUTIONS on page 3 of this publication. incidence of component damage caused by static by static NOTE: If unforeseen circumstances create conflict between the electricity.
  • Page 5 c. Qulckly move the soldering iron tip to the junction of the Fuse and Conventional Resistor component lead and the printed circuit foil, and hold it Removal/Replacement there only until the solder flows onto and around both the 1. Clip each fuse or resistor lead at top of the circuit board component lead and the foil.

  • Page 6: 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) NTSC 4.43 34.4MHz (M) Intermediate Frequency (Unit : MHz) Power requirement : 110~240V, 50/60Hz VISION IF : 38.9MHz COLOR IF : 34.47MHz(4.43)

  • Page 7: Description Of Controls

    DECRIPTIONS 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. Remote control handset Before you use the remote control handset, please install the bat- teries.

  • Page 8: Battery Installation

    10. MUTE switches the sound on or off. 11. TV/AV selects TV or AV mode. clears the menu from the screen. switches the set on from standby. 12. I/II/ (option) selects the language during dual language broadcast. (option) selects the sound output. POWER MUTE 13.

  • Page 9: Front Panel

    Front panel Shown is a simplified representation of front or side panel. Here shown may be somewhat different from your set. VIDEO VIDEO ON/OFF MENU OK VIDEO (L)-AUDIO-(R) P-TURBO-S AUDIO AUDIO 2 3 4 TURBO ON/OFF MENU OK VIDEO AUDIO SOUND PICTURE VIDEO VIDEO...

  • Page 10: 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 11: Adjustment

    ADJUSTMENT Safety Precautions Option Code Function Remark 1. It is safe to adjust after using insulating transformer W/O TBS between the power supply line and chassis input to WITH TBS prevent the risk of electric shock and protect the instrument. W/O EYE 2.

  • Page 12: Screen Voltage Adjustment

    Table below. 5) Press the OK( ) button to memorize the data. Status Initial Data Remark 6700VPF009G Tuner P/N 6700VPF016A LG Innotek(W/S TUNER) Marker DAEWOO(W/S TUNER) 2.7! 0.05V 2.7! 0.05V AGC Voltage 6700VPF009S Tuner P/N BLO-R...
  • Page 13 2. Deflection Initial Setup Data Status Default 21" FLAT S/S 21" FLAT LG 3. Deflection Adjustment Procedure VL (Vertical Linearity) Adjust so that the boundary line between upper and lower half is in accord with geometric horizontal center of the CPT.

  • Page 14: Purity & Convergence Adjustment

    PURITY & CONVERGENCE ADJUSTMENT Caution: 5. Reconnect the internal degaussing coil. Convergence and Purity have been factory aligned. Do not attempt to tamper with these alignments. 6. Position the beam bender locking rings at the 9 o'clock However, the effects of adjacent receiver components, or position and the other three pairs of tabs (2,4 and 6 pole replacement of picture tube or deflection yoke may require the magnets) at the 12 o'clock position.
  • Page 15 1.ADJUST YOKE Z-AXIS FIRST 2 .ADJUST BEAM BENDER 2 POLE TO GET EQUAL BLUE MAGNET TO GET FOUR EQUAL COLOR CIRCLES COLOR CIRCLES MAGNETS 8. Referring to above, perform the following two steps: 6. Reconnect the internal degaussing coil and apply AC power. a.
  • Page 16 ROTATION DIRECTION RING MOVEMENT OF RED OF BOTH TABS PAIRS AND BLUE BEAMS OPPOSITE POLE SAME OPPOSITE POLE SAME UP/DOWN ROCKING OF THE YOKE LEFT/RIGHT ROCKING OF THE YOKE UP/DOWN ROCKING OF THE YOKE LEET/RIGHT ROCKING OF THE YOKE CAUSES OPPOSITE ROTATION OF RED CAUSES OPPOSITE SIZE CHANGE OF THE CAUSES OPPOSITE ROTATION OF RED CAUSES OPPOSITE SIZE CHANGE OF...

  • Page 17: Block Diagram

    BLOCK DIAGRAM - 17 -...

  • Page 18: Exploded View

    EXPLODED VIEW - 18 -...

  • Page 19: Exploded View Parts List

    The components identified by mark critical for safety. EXPLODED VIEW PARTS LIST Replace only with part number specified. PART NO LOCA. NO DESCRIPTIONS 14” 20” 21” 2055-00744L 2055-V1221Y 6341V21006B CPT ASSY 2055-00744L 6341V21006C CPT ASSY *HAFIDH ,LGEMC,BROTHERS 2055-V1221D 6341V21006D CPT ASSY *LGEGF 2055-01221C 2426GDA80CC CPT ASSY *TELESTAR...
  • Page 20 EXPLODED VIEW (CB90) - 20 -...
  • Page 21 4980V00035A SUPPORTER,BASE EVA NONE 3809V00345B BACK COVER ASSEMBLY,RF-21CB90VQ(PPL) 1PHONE . 6871VMMP38Q PWB(PCB) ASSEMBLY,MAIN MC019A RF-21CB90VQ.KMLLKS2(SHAHAB PPL) 6871VSM360R PWB(PCB) ASSEMBLY,MAIN SUB TURBO(019A/B)PIC/SOUND (W/O GAME)F-CKD ETC. 0IGL120104A IC,LG SEMICONDUCTOR,CDS SENSOR MODULE(P1201-04) 332-057B SCREW,DRAWING ASSY,HEXAGON HEAD 1PTF0403116 SCREW,TAP TITE(P)[TRUSS HEAD] - 21 -...

  • Page 22: Replacement Parts List

    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 ZD441 0DZ620009AK DIODE,ZENERS GDZJ6.2B TP GRANDE DO34 0.5W ZD442 0DZ820009BF DIODE,ZENERS GDZJ8.2B TP GRANDE DO34 0.5W HIC01 0IZZVF0017C IC,GAME MODULE...
  • Page 23 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. digit in the P/No. means as CE : Electrolytic RN : Metal Film Replace only with part number specified.
  • Page 24 The components identified by mark For Capacitor & Resistors, CC, CX, CK, CN : Ceramic RD : Carbon Film critical for safety. the charactors at 2nd and 3rd CQ : Polyestor RS : Metal Oxide Film digit in the P/No. means as CE : Electrolytic RN : Metal Film Replace only with part number specified.
  • Page 25 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. digit in the P/No. means as CE : Electrolytic RN : Metal Film Replace only with part number specified.
  • Page 26 0RD5601F609 5.6K OHM 1/6 W 5.00% TA52 “ 0RD3301F609 3.3K OHM 1/6 W 5.00% TA52 SW01 140-315A SWITCH,TACT SKHV17910B LG C&D NON 12V R606 0RD1102F609 11K OHM 1/6 W 5.00% TA52 SW02 140-315A SWITCH,TACT SKHV17910B LG C&D NON 12V “...
  • Page 27 MANUAL,OWNERS NON LG AR/EN 6710V00090C REMOTE CONTROLLER W/TXT GS 6710V00090V REMOTE CONTROLLER W/O TXT 6710V00090D REMOTE CONTROLLER,W/O TXT LG 6710V00074B REMOTE CONTROLLER W/O TXT LG LGEIN 6710V00090A REMOTE CONTROLLER W/TXT LG 5010V00005C ANTENNA 2 POLE 3 SECTION 700MM 650MM MISCELLANEOUS SK901 6620VBC003A SOCKET,CPT PCS030A 8PIN 14/360 “...
  • Page 28 P/NO:3854VA0083A-S 2002.11.14...
  • Page 29 PRINTED CIRCUIT BOARD...
  • Page 30 COMPONENT LOCATION GUIDE C01..B4 C403 ..G4 C607..B3 C811 ..G3 F812 ..E2 L801 ..E4 R05..B4 R218 ..D5 R554 ..D4 R820..F4 C02..B4 C404 ..G4 C611..B3 C812..E2 F801A ..G2 L802 ..E3 R06..B3 R219 ..D5 R555 ..D4 R822..F4 C03..B3 C405 ..G4 C612..B3 C813 ..D2 F801B ..G1 LD01..F1 R07..B3...

  • Page 31: Svc. Sheet

    SVC. SHEET : 3854V A0083A-S SVC. SHE...
  • Page 32 Dec.,2003 P/NO : 3828VD0107N Printed in Korea...

This manual is also suitable for:

Rf/rt-14/21ca80m/mxCf-21ca810ex/rf-21cb90vq

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