website:http://biz.LGservice.com e-mail:http://www.LGEservice.com/techsup.html LCD TV SERVICE MANUAL CHASSIS : ML-041B MODEL : RM-20LA70(RM-20LA70 Rev A) CAUTION *( ) ID LABEL Model No. BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. *Same looking with new chassis *Issue Date; 2004.
CONTENTS CONTENTS .............................................................................................. 2 PRODUCT SAFETY ..................................................................................3 SPECIFICATION ........................................................................................6 ADJUSTMENT INSTRUCTION ...............................................................10 TROUBLE SHOOTING ............................................................................
SAFETY PRECAUTIONS IMPORTANT SAFETY NOTICE Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in 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. Do not modify the original design without permission of manufacturer.
SERVICING PRECAUTIONS CAUTION: Before servicing receivers covered by this service manual and its supplements and addenda, read and follow the SAFETY PRECAUTIONS on page 3 of this publication. NOTE: If unforeseen circumstances create conflict between the following servicing precautions and any of the safety precautions on page 3 of this publication, always follow the safety precautions. Remember: Safety First. General Servicing Precautions 1.
IC Remove/Replacement Some chassis circuit boards have slotted holes (oblong) through which the IC leads are inserted and then bent flat against the circuit foil. When holes are the slotted type, the following technique should be used to remove and replace the IC. When working with boards using the familiar round hole, use the standard technique as outlined in paragraphs 5 and 6 above. Removal 1.
SPECIFICATION NOTE : Specifications and others are subject to change without notice for improvement. 1. Application range This specification is applied to ML-041B chassis. 2. Requirement for Test Testing for standard of each part must be followed in below condition. (1) Temperature: 25°C ± 2°C (2) Humidity: 65% ± 10% (3) Power: Standard input voltage (AC 100-240V, 50/60Hz) (4) Measurement must be performed after heat-run more than 30min.
4. Feature and Function No.
6.Engineering Specification No. 1 Item Specification Power Supply H/V Sync Video Active Normal On/On Stand By Off/On Suspend Mode On/Off DPM Off Mode Off/Off Cut-off Switch off - Remark Power Consumption 65W ITEM D-SUB Pin Configuraion GREEN 1W Off LED 1W 1W - OFF 0W PBP SWAP 2 LED Color Spectification 1: RED 2: Green 3: Blue: 4: ID2(GND) 5: S.T(GND) 6: RED GND 7: Green GND 8: Blue GND 9: N.
6-2.Power NO 1 2 3 4 5 6 7 8 9 10 11 Item AC Power Shut Down Voltage DC Voltage, Inverter DC Voltage, LCD Panel DC Voltage, Audio DC Voltage, Tuner(5) DC Voltage, Tuner(9) DC Voltage, Tuning(31) DC Voltage, VCTi(5) DC Voltage, VCTi(8) DC Voltage, VCTi(3.3) DC Voltage, VCTi(1.8) DC Voltage, GM2221 (3.3) DC Voltage, GM2221 (1.8) DC Voltage, Digital (3.3) DC Voltage, Digital (5) Min Typ Max Unit 90 22.8 11.4 14.0 4.5 8.5 31 4.5 7.5 3.1 1.6 3.1 1.6 2.8 4.5 24 12 15 5 9 33 5 8 3.3 1.8 3.3 1.8 3.
ADJUSTMENT INSTRUCTION 1. Application Object This instruction is for the application to the LCD TV. 2. Adjustment 2.1 Adjustment overview The unit is set to automatically adjust using the factory automation equipment. However when errors occur, it should be adjusted manually. 2.2 Auto Gain/Offset adjustment 2.2.1 RF Mode adjustment 2.2.1.1 Adjustment preparation Conduct Heat Run at the RF fog signals for more than 30 minutes. 2.2.1.
SVC REMOCON 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 To turn the TV on or off To turn the TV on automatically if the power is supplied to the TV. (Use the POWER ON POWER key to deactivate): It should be deactivated when delivered. To activate the mute function. MUTE To check TV screen image easily.
TROUBLESHOOTING No power (LED indicator off) :[A]Process Check 15V or 5V of Lips Fail Check short of main B/D or Change Lips Pass Check Output of Q1100 Pass Check Output of IC1107, IC104 Change IC1107, IC1104 Fail Pass Change LED Assy Check LED Assy Fail Pass Check P1100, P210 Connector Change Q1100 Fail
No Raster :[B]Process Check LED Status on display unit Check L900,L901 L902,L903 Repeat A PROCESS Fail Fail Change L900,L901, L902,L903 Pass Check the input/ Output of IC901 Change IC901 Fail Pass Check inverter Connector or inverter Fail Change inverter connector or inverter Pass Check panel link Cable or module Fail Change panel link cable or module Pass Check input source cable and jack Fail Change module
No Raster on Component signal Repeat [A] Process Pass Check the signal of L1200, L1202, L1203 Fail Check JA1200 or RCA CABLE Check the input/ output of IC1 Fail Re-soldering or Change the defect part, Check X11 Check the input/output of IC800, IC851 Fail Re-soldering or Change the defect part Fail Re-soldering or Change the defect part, Check X900 Pass Pass Check the input/ output of IC901 Pass Check input source cable and jack
No Raster on AV Signal (Video, S-Video) Repeat [A] Process No Raster on TV(RF) signal Fail Check the output of TU1000 Pass Check the signal of L1209, L1210, L1212 Fail Change L1209, L1210, L1212 Pass Check the input/output of IC1 Fail Re-soldering or Change the defect part Chek X11 Fail Re-soldering or Change the defect part Fail Re-soldering or Change the defect part Check X900 Pass Check the input/output of IC800, IC851 Pass Check the input/output of IC901 Pass Check input source cab
No Sound Check the input source Fail Change source input Pass Check the input/output of IC1 Fail Re-soldering or Change the defect part Check X11 Fail Re-soldering or Change the defect part Pass Check the input/output of IC100,IC101 Pass Check the speaker Fail Pass Check the speaker wire Change speaker
AC IN Y Pb ANALOG SIGNAL DIGITAL SIGNAL SOUND INPUT IF +,- INPUT SOUND OUTPUT Pr ML-041B Block Diagram H/P V COMPONENT AT24C16 IC4 S-VHS SCART R,G,B SCART V,L,R POWER TC90A65F IC500 SM5301BS IC800 L,R VCTI IC1 RGB OUT L, R IC100 IC101 Audio Amp D-SUB 14066 IC202 S A W Z1000 IF+,- PC RGB M52758FP IC851 Tuner TU1000 LA7222 IC2 GM2221 IC901 SIDE_AV PC L,R SIDE V SIDE_L,R PC AUDIO AT49F IC905 TTL 1 OUT TTL 2 OUT LVDS 1 OUT BLOCK DIAGRAM
BLOCK DIAGRAM DESCRIPTION 1. Video Controller Unit & Display Data Conversion Unit The video controller unit receives the video signals inputted through the tuner, AV port (AV1, AV2, S-Video, component), and converts them into an analog RGB signal through the microcomputer (VCTI) combined with the video decoder that integrates various functions in one chip.
4P_2.5MM SHIELD GND: 2PIN, 4PIN 500MM 750MM 1 RECEPTERCLE P1203 9 18P_1.0MM FFC 54MM (RZ ONLY) P3 5 4 2 6P_2.0MM H-B P210 600MM P901 P904 P902 6 SPEAKER IR_LED SPEAKER 2P_AC_SOCKET 8 11P_2.0MM H-H 100MM 3 1. 20P LVDS : 200MM 2. 41P TTL 3. 50P TTL : 145MM WIRING DIAGRAM 7 LOCAL KEY 3P_2.5MM H-B 220MM 6631T25019Y 6631T11017P-CMO 1 2 6631T11012R 6631T20028G 6631T20029X 6631T25021A 6620K00007C 4 5 6 7 8 or 6620K00007A 6631T11021A 3 6631T11017Q-AUO Part No. No.
5 1 5 7 6 2 10 8 9 13 12 14 11 EXPLODED VIEW 20 18 17 19 22 21 3 4 15 16
EXPLODED VIEW PARTS LIST No. PART NO. DESCRIPTION 1 3091TKD005A CABINET ASSEMBLY,RM-20LA77 BRAND 3090V00519 NON 2 6306V20002A LCD(LIQUID CRYSTAL DISPLAY), V201V1-T02 VGA CHIMEI TFT COLOR NON 3 3809TKD002G BACK COVER ASSEMBLY, RM-20LA77 3808V00407 CMO 4 4811V00073A BRACKET ASSEMBLY, STAND RZ-20LA70 NON .
REPLACEMENT PARTS LIST For Capacitor & Resistors, the charactors at 2nd and 3rd digit in the P/No. means as follows; *S *AL LOC. NO. PART NO. CC, CX, CK, CN, CH : Ceramic CQ : Polyestor CE : Electrolytic CF : Fixed Film DATE: 2004. 6. 16. DESCRIPTION / SPECIFICATION *S *AL LOC. NO.
*S *AL LOC. NO. C115 C116 C117 C118 C12 C125 C126 C200 C22 C23 C24 C25 C26 C27 C28 C29 C3 C30 C31 C32 C33 C34 C35 C37 C40 C42 C45 C52 C67 C75 C800 C801 C802 C807 C811 C816 C82 C861 C865 C901 C903 C904 C905 C906 C911 C912 C913 C914 C915 C916 C918 C919 C921 C922 C961 C121 C122 C43 C47 C48 C53 C56 PART NO.
*S *AL LOC. NO. IC100 IC101 IC202 IC1 IC800 IC901 IC1101 IC1103 IC1108 IC1111 IC1105 IC1106 IC1114 IC1115 IC1110 IC1113 PART NO. DATE: 2004. 06.16.
*S *AL LOC. NO. R13 R202 R208 R209 R210 R37 R7 R817 R822 R834 R836 R837 R961 R964 R10 R1001 R1002 R1003 R1004 R1005 R1014 R11 R1105 R1107 R1149 R1150 R124 R125 R127 R130 R131 R138 R139 R15 R16 R17 R18 R19 R20 R203 R205 R206 R207 R21 R22 R221 R224 R225 R226 R23 R24 R240 R25 R28 R29 R34 R41 R45 R46 R49 R50 R51 PART NO.
*S *AL LOC. NO. PART NO. DATE: 2004. 06.16. DESCRIPTION / SPECIFICATION 6200QL3002F 6202VDT002E 6202VDT002B 6620F00017A 6700VS0003C "X6966M EPCOS ST SIP5K, 6200QL" SX-1SMD SUNNY RADIAL 20250000 SX-1 SUNNY SC14.3MHZ +/- 30 P CCSD-32T-SM WOOYOUNG 32P PLCC TAEW-G051P LG INOTEK MULTI VS *S *AL LOC. NO. PART NO. DATE: 2004. 06.16.
P/NO : 3828TSL103N Jun.
