Table of Contents
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COLOR TV
SERVICE MANUAL
CHASSIS : MC-049B
MODEL:RT-21FB55M/R/RX/V/VE
MODEL:RT-21FB55VQ/VW/VX
MODEL:RT-21FB56VY/57R/V
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
VIDEO
L
R
AUDIO
MENU
OK
VOL
PR
ON/OFF
AV
website:http://biz.LGservice.com
e-mail:http://www.LGEservice.com/techsup.html
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Table of Contents
Related Manuals for LG RT-21FB55M
Summary of Contents for LG RT-21FB55M
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Page 1: Service Manual
COLOR TV SERVICE MANUAL CHASSIS : MC-049B MODEL:RT-21FB55M/R/RX/V/VE MODEL:RT-21FB55VQ/VW/VX MODEL:RT-21FB56VY/57R/V CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. VIDEO AUDIO MENU ON/OFF... -
Page 2: Table Of Contents
CONTENTS Contents ........................2 Safety Precautions....................3 Control Descriptions..................4 Specifications......................7 Adjustment Instructions .................8 T rouble Shooting....................12 Printed circuit board..................16 Block Diagram ......................19 Exploded View....................20 Exploded View Parts List ................21 Replacement Parts List .................22 SVC. Sheet........................- 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: Control Descriptions
DESCRIPTION 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 5 17. SURROUND (º º / MENU/INDEX TV/AV selects surround sound. 18. VCR BUTTONS control a LG video cassette recorder. 19. PIP BUTTONS (option) switches the sub picture on or off. PR +/- selects a programme for the sub picture. SWAP alternates between main and sub picture.
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Page 6: Front Panel
Front panel RF/RT-21FA35 series 1. MAIN POWER (ON/OFF) switches the set on or off. MENU OK ON/OFF 2. POWER/STANDBY INDICATOR L/MONO illuminates brightly when the set is in standby mode. dims when the set is switched on. RF/RT-21FB25 series blinks when signal is input from the remote control. -
Page 7: Specifications
Test and Inspection Method (CST must be tested 40 ± 5¡C . Humidity : 50%) 2) Relative Humidity : 65 ± 10% 1) Capacity : Follow LG electronics TV testing Standard. 2) Another Required Standard 3) Power : Standard input Voltage (110-240V~, 50/60Hz) -
Page 8: Adjustment Instructions
ADJUSTMENT INSTRUCTIONS 1. Application Object 4. Purity & Convergence adjustment These instructions are applied to all of the color TV, MC-049B. As preparatory operations before CPT Assembling assembling CPT, wind cotton Tape for 2. Notes protecting to CPT NECK and DY, CPT connection parts. -
Page 9: Screen Voltage Adjustment
(4) Maintain as angle of (3) and rotate the tab to accord with 2. White balance IIC Parameter vertical line of Red and Blue color in the middle of screen. Program TWBeng_v049 Program TWBeng_v049 Speed Delay (5) Open angle of the two tab of 6 pole magnet by isogonic Vcd Slave BCF0 Eprom_Slave... - Page 10 (4) VS (Vertical Shift) adjustment: 8-4. OPTION2 Function Adjust so that the geometric vertical center line is in accord Option Code Function with vertical center line of CPT. (5) HS(Horizontal Shift) adjustment: Without A/V2 Adjust so that the geometric horizontal center line is in With AV2 accord with horizontal center line of CPT.
- Page 11 8-6. OPTION4 Function Option Code Function ENG ONLY OSD L EU-5EA EU ETC GREECE EU-ALL FARSI ARAB URDU E+HINDI E+I+M+V E+THAI E+CHINA WEST EU TXT L EAST EU1 TURKEY EU EAST EU2 CYRILLIC1 CYRILLIC2 CYRILLIC3 TURK GRE1 TURK GRE2 TURK GRE3 ARAB FRA ARAB ENG ARAB HEB1...
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Page 12: Trouble Shooting
TROUBLE SHOOTING RF- STEREO MODEL PICTURE O. K / NO SOUND Selec t ed c o rrec t syst em In m enu Chec k t he wavef o rm Chec k / Rep lac e IF 1 o f TU101 TU 101 Chec k t he wavef o rm Chec k The Vo lt ag e... - Page 13 No Ras ter ( 2/ 2) CHECK B+ At D829 c at ho d e No rm al Ab no rm al Op en Is t he vo lt ag e a t Chec k eac h p in vo lag e o f IC11 Fuse o f AC line Chec k / Rep lac e Chec k t he...
- Page 14 NO Pic t ure No So und Is Any OSD d isp la yed ? Chec k IC11 p in71, 7 2, 73 Chec k rec eiving syst em in MENU & exec ut e Aut o Pro g ram . ( R, G, B o ut ) Do es t he auto Pro g ra m Op erat e p ro p erly...
- Page 15 AV STERRO / MONO MODEL Selec t c o rrec t syst em In m enu Chec k t he c o nnec t io n Of AV eq uip m ent Chec k t he wavef o rm At p in16, 17 o f IC11 Chec k TU1 01 Tuner Chec k t he vo lt ag e Chec k t he wavef o rm...
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Page 16: Printed Circuit Board
PRINTED CIRCUIT BOARD MAIN - 16 -... - Page 17 COMPONENT LOCATION GUIDE C10 ..C4 C501..B4 C626 ..D5 D823..E1 J231 ..C1 J541 ..B3 J810 ..D2 R19 ..D1 R421..F3 R805 ..G2 C11 ..C4 C502..B4 C627..A2 D827 ..D2 J232 ..D1 J542 ..B3 J811 ..D2 R20 ..D1 R422 ..G3 R806 ..G3 C12 ..C4 C503 ..D4 C632 ..D4 D828 ..D2...
- Page 18 - 18 -...
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Page 19: Block Diagram
BLOCK DIAGRA VIDEO/AUDIO RESET DATA/CLOCK ON / OFF Y/Cb/Cr-IN SCART RGB-IN AV-IN TV / MONITOR OUT PIP-VIDEO PIP-RGB - 19 -... -
Page 20: Exploded View
EXPLODED VIEW - 20 -... -
Page 21: Exploded View Parts List
CPT, A51QDJ420X 000MGB 16KHZ LPDSG (RT-21FB55VE.LMLLSB8) 6335V21019A CPT ASSEMBLY, A51QDJ420X 01MDDR M(+0.30G) 0G (FOR SHAHAB) 6335V21019F CPT ASSEMBLY, A51QDJ420X 01LDDR L(+0.50G) 0G LG-PHILIPS DISPLAYS AK CPT ITC 120-C77G SPEAKER,FULLRANGE C122P02K1459 8 OHM 10/15W 130 57*117 120-C77M SPEAKER,FULLRANGE C122P02K1459 ESTEC 8 OHM 10/15W 130DB 57*117MM... -
Page 22: Replacement Parts List
REPLACEMENT PARTS LIST For Capacitor & Resistors, the CC, CX, CK, CN : Ceramic RD : Carbon Film charactors at 2nd and 3rd digit CQ : Polyestor RS : Metal Oxide Film in the P/No. means as follows; CE : Electrolytic RN : Metal Film RF : Fusible LOCA. - Page 23 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 24 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 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 R912 0RD2204A609 2.2M OHM 1/2 W(7.0) 5.00% TA52 10 OHM 1/6 W 5% TA52 R914 0RD0102F609 SWITCH SW11 140-315A TACT SKHV17910B LG C&D 12V SW12 140-315A TACT SKHV17910B LG C&D 12V 140-315A TACT SKHV17910B LG C&D 12V SW13 SW14 140-315A TACT SKHV17910B LG C&D 12V...
- Page 27 P/NO: 3854VA0162A - S1 2004.6.12...
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Page 28: Svc. Sheet
SVC. SHEET : 3854V A0162A-S... - Page 29 Jul., 2005 P/NO : 3828VD0188Y Printed in Korea...