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LG RT-21FB20R Service Manual

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COLOR TV
SERVICE MANUAL
CHASSIS : MC-019A
MODEL : RF/RT-21FB20R/RE/RQ/RX/RW
MODEL :
RF/RT-21FB20V/VE/VG/VQ/VW
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-21FB20R

  • Page 1: Service Manual

    COLOR TV SERVICE MANUAL CHASSIS : MC-019A MODEL : RF/RT-21FB20R/RE/RQ/RX/RW MODEL : RF/RT-21FB20V/VE/VG/VQ/VW 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 Exploded View Parts List ................19 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) ¡...

  • 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

    RF/RT-21FA30/31/32 series 1. MAIN POWER (ON/OFF) switches the set on or off. 2. POWER/STANDBY INDICATOR MENU OK ON/OFF illuminates brightly when the set is in standby mode. 9 10 dims when the set is switched on. CF/CT-21Q20K/21K/22K series blinks when signal is input from the remote control.

  • 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.

  • Page 12: Focus Adjustment

    X=288¡ 8, Y=295¡ X=272¡ 8, 11,000K) 5) Press the OK(¡Æ ) button to memorize the data. Status Initial Data Remark Tuner P/N 6700VPF009G 6700VPF016A Marker LG Innotek(W/S TUNER) DAEWOO(W/S TUNER) 2.7¡ 0.05V AGC Voltage 2.7¡ 0.05V Tuner P/N 6700VPF009S BLO-R LG Innotek(TBS TUNER)

  • 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

    8. Referring to above, perform the following two steps: 6. Reconnect the internal degaussing coil and apply AC power. a. Adjust the yoke Z-axis to obtain equal blue circles. b. Adjust the appropriate beam bender tabs to obtain correct 7. Turn the receiver on for 10 seconds to perform internal purity (four equal circles).

  • Page 16

    UP/DOWN ROCKING OF THE YOKE LEFT/RIGHT ROCKING OF THE YOKE CAUSES OPPOSITE ROTATION OF RED CAUSES OPPOSITE SIZE CHANGE OF THE AND BLUE RASTERS RED AND BLUE RASTERS 12. While watching the 6 o'clock positions on the screen, rock the 17.

  • Page 17: Block Diagram

    BLOCK DIAGRAM - 17 -...

  • Page 18: Exploded View

    EXPLODED VIEW - 18 -...

  • Page 19: Exploded View Parts List

    PWB ASSY,MAIN 019A RT-21FB20VE SCART 6871VMM886E PWB ASSY,MAIN 019A RT-21FB20VQ SKD 6871VMM886J PWB ASSY,MAIN 019A RT-21FB20VE CKD 6871VMM886P PWB ASSY,MAIN 019A RT-21FB20V 6871VMM886N PWB ASSY,MAIN 019A RT-21FB20R 6871VMM792V PWB ASSY,MAIN 019A RT-21FB20VQ SCART 6871VMM792W PWB ASSY,MAIN 019A RT-21FB20RQ 6871VMM792Y PWB ASSY,MAIN 019A RT-21FB20VQ 6871VMM886S...

  • Page 20: 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,BK GAME MODULE...

  • Page 21

    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 22

    100UF STD 16V M FL TP5 C829 0CF1021047A 1000PF D 800V 5% TP 7.5 M/PP N P01A 366-932B CONNECTOR,2.5MM 3P GIL-G LG CABLE S C830 0CE475DK618 4.7UF STD 50V 20% FL TP 5 P02A 366-932B CONNECTOR,2.5MM 3P GIL-G LG CABLE S...

  • 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

    220 OHM 1/2 W 5.00% TA52 RC801 180-822N RWR 7W 1.0 OHM J PD SWITCH SW1101 140-313A SWITCH,TACT 2LEAD 100G(TA) LG C&D NON SW1102 140-313A SWITCH,TACT 2LEAD 100G(TA) LG C&D NON SW1103 140-313A SWITCH,TACT 2LEAD 100G(TA) LG C&D NON SW1104 140-313A SWITCH,TACT 2LEAD 100G(TA) LG C&D NON...

  • Page 26

    PRINTED CIRCUIT BOARD WIRING DIAGRAM COMPONENT LOCATION GUIDE MAIN & CPT 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...

  • Page 27

    P/NO:3854VA0083A-S 2001.04.20...

  • Page 28: Svc. Sheet

    SVC. SHEET : 3854V A0083A-S SVC. SHE...

  • Page 29

    Jan,2004 P/NO : 3828VD0126C Printed in Korea...

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