LG RM-20LA70 Service Manual
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LG RM-20LA70 Service Manual

LG RM-20LA70 Service Manual

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LCD TV
SERVICE MANUAL
CHASSIS : ML-041B
MODEL : RM/RZ-20LA70
*(
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
e-mail:http://www.LGEservice.com/techsup.html
) ID LABEL Model No.
website:http://biz.LGservice.com
(RM-20LA70 Rev A)
*Same looking with new chassis
*Issue Date; 2004. 06

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  • Page 1 LCD TV SERVICE MANUAL CHASSIS : ML-041B MODEL : RM/RZ-20LA70 (RM-20LA70 Rev A) ) ID LABEL Model No. CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. *Same looking with new chassis *Issue Date; 2004. 06...

  • Page 2: Table Of Contents

    CONTENTS CONTENTS ....................2 PRODUCT SAFETY ..................3 SPECIFICATION ..................6 ADJUSTMENT INSTRUCTION ...............10 TROUBLE SHOOTING ................12 BLOCK DIAGRAM...................17 WIRING DIAGRAM ..................19 EXPLODED VIEW .................. 20 EXPLODED VIEW PARTS LIST ..............21 REPLACEMENT PARTS LIST ............... 22 SVC. SHEET ....................

  • Page 3: Product Safety

    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.
  • Page 4 SERVICING PRECAUTIONS CAUTION: Before servicing receivers covered by this service unit under test. manual and its supplements and addenda, read and follow the 2. After removing an electrical assembly equipped with ES SAFETY PRECAUTIONS on page 3 of this publication. devices, place the assembly on a conductive surface such as NOTE: If unforeseen circumstances create conflict between the aluminum foil, to prevent electrostatic charge buildup or...
  • Page 5 IC Remove/Replacement Some chassis circuit boards have slotted holes (oblong) through Circuit Board Foil Repair which the IC leads are inserted and then bent flat against the Excessive heat applied to the copper foil of any printed circuit circuit foil. When holes are the slotted type, the following technique board will weaken the adhesive that bonds the foil to the circuit should be used to remove and replace the IC.

  • Page 6: Specification

    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 ±...
  • Page 7 4. Feature and Function Item Specification Remark Teletext Top(option) TOP, FLOF REMOCON NEC Code PAL/ NTSC CVBS VIDEO Input Rear S-VIDEO Input Rear Component input Rear (option, NT) PERI TV Connector Full SCART : 1 Rear (option,EU) H/p input Rear RS-232 Discrete IR 2 Carrier Stereo...
  • Page 8 6.Engineering Specification Item Specification Remark Power Supply H/V Sync Video Power Consumption LED Color Normal On/On Active GREEN Stand By Off/On Suspend Mode On/Off DPM Off Mode Off/Off Cut-off Switch off PBP SWAP ON/OFF ITEM Spectification Remark D-SUB Pin Configuraion 1: RED 2: Green 3: Blue:...
  • Page 9 6-2.Power Item Unit Remark AC Power Shut Down Voltage DC Voltage, Inverter 22.8 25.2 DC Voltage, LCD Panel 11.4 12.6 DC Voltage, Audio 14.0 16.0 DC Voltage, Tuner(5) DC Voltage, Tuner(9) Japan only 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)

  • Page 10: Adjustment Instruction

    Once the adjustment is completed, press the Enter and press VOL+ Key at the Auto Gain menu. Key to save and finish the adjustment (In case of RM-20LA70, press IN-START Key twice) Once the adjustment is completed, press the Enter Key to save and finish the adjustment.
  • Page 11 SVC REMOCON To turn the TV on or off POWER 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.

  • Page 12: Troubleshooting

    TROUBLESHOOTING No power :[A]Process (LED indicator off) Check short of main B/D Check 15V or 5V or Change Lips Fail of Lips Pass Check Output of Change Q1100 Fail Q1100 Pass Check Output of Change IC1107, IC1104 IC1107, IC104 Fail Pass Change LED Assy Check LED Assy...
  • Page 13 No Raster :[B]Process Check LED Status Repeat A PROCESS on display unit Fail Check L900,L901 Change L900,L901, L902,L903 L902,L903 Fail Pass Check the input/ Change IC901 Output of IC901 Fail Pass Change inverter Check inverter connector or inverter Connector or inverter Fail Pass Change panel link...
  • Page 14 No Raster on Component signal Repeat [A] Process Pass Check the signal of Check JA1200 or L1200, L1202, L1203 RCA CABLE Fail Pass Re-soldering or Check the input/ Change the defect part, Fail output of IC1 Check X11 Re-soldering or Check the input/output Change the defect part Fail...
  • Page 15 No Raster on AV Signal No Raster on TV(RF) signal (Video, S-Video) Check 5V, 33V of TU1000 Repeat Check the output of Re-soldering or [A] Process TU1000 Fail Fail Change the defect part Pass Check the signal of Change L1209, L1210, L1209, L1210, L1212 L1212 Fail...
  • Page 16 No Sound Check the Change source input input source Fail Pass Re-soldering or Check the input/output Change the defect part of IC1 Fail Check X11 Pass Re-soldering or Check the input/output Change the defect part of IC100,IC101 Fail Pass Check the speaker Change speaker Fail Pass...

  • Page 17: Block Diagram

    BLOCK DIAGRAM...
  • Page 18 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.

  • Page 19: Wiring Diagram

    LOCAL KEY IR_LED...

  • Page 21: Exploded View Parts List

    MAIN TOTAL ASSEMBLY, RM-20LA77 BRAND ML-041B 6871TPT280A PWB(PCB) ASSEMBLY,POWER, RM-20LA77 POWER TOTAL LIEN CHANG LIPS FOR CMO/AUO 6871TST561A PWB(PCB) ASSEMBLY,SUB, RM-20LA70 ML-041B SUB TOTAL BRAND JACK(DVD) BOARD ASSY 4951TKK186A METAL ASSEMBLY, SHIELD REAR RM-20LA77 4950TKK916A METAL, PLATE 15, 20LA70 REAR A/V "B"T 4810V00925B BRACKET, REAR AV RZ-15LA70 ML024E HIPS .

  • Page 22: Replacement Parts List

    REPLACEMENT PARTS LIST For Capacitor & Resistors, the CC, CX, CK, CN, CH : Ceramic RD : Carbon Film charactors at 2nd and 3rd digit in the CQ : Polyestor RS : Metal Oxide Film P/No. means as follows; CE : Electrolytic RN : Metal Film CF : Fixed Film RH : CHIP, Metal Glazed(Chip)
  • Page 23 DATE: 2004. 06.16. DATE: 2004. 06.16. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C115 0CK104CK56A 0.1UF 1608 50V 10% R/TP X7R 0CC221CK41A 220PF 1608 50V 5% R/TP NP0 C116 0CK562CK51A 5600PF 1608 50V 10% R/TP B(Y5 0CC221CK41A...
  • Page 24 DATE: 2004. 06.16. DATE: 2004. 06.16. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION IC100 0IMCRMZ002A MP7720 MONOLITHIC POWER SYSTE 0TR150400BA CHIP 2SA1504S(ASY) BK KEC - - IC101 0IMCRMZ002A MP7720 MONOLITHIC POWER SYSTE 0TR150400BA CHIP 2SA1504S(ASY) BK KEC - - IC202...
  • Page 25 DATE: 2004. 06.16. DATE: 2004. 06.16. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION 0RH1001D622 1K OHM 1 / 10 W 2012 5.00% D 0RJ1000D677 100 OHM 1/10 W 5% 1608 R/TP R202 0RH0222D622 22 OHM 1 / 10 W 2012 5.00% D...
  • Page 26 75 1/10W 5 D.R/TP R2208 0RN2000F409 200 1/6W 1% TA52 R1218 0RH0752D622 75 1/10W 5 D.R/TP SW2200 140-313A TACT 2LEAD 100G(TA) LG C&D NO R1219 0RH0752D622 75 1/10W 5 D.R/TP SW2201 140-313A TACT 2LEAD 100G(TA) LG C&D NO R1220 0RH0752D622 75 1/10W 5 D.R/TP...
  • Page 29 Jun., 2004 P/NO : 3828TSL103N Printed in Korea...

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