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LG RT-15LA70 Service Manual

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LCD TV

SERVICE MANUAL

CHASSIS : ML-041B
MODEL: RT-15LA70
*(
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
e-mail:http://www.LGEservice.com/techsup.html
(RT-15LA70 Rev A)
) ID LABEL Model No.
R
website:http://biz.LGservice.com
*Same looking with new chassis
*Issue Date; 2004. 06

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  • Page 1: Service Manual

    LCD TV SERVICE MANUAL CHASSIS : ML-041B MODEL: RT-15LA70 (RT-15LA70 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 ..................4 TIMING CHART..................11 ADJUSTMENT INSTRUCTION ...............12 TROUBLE SHOOTING ................16 BLOCK DIAGRAM...................21 WIRING DIAGRAM ..................23 EXPLODED VIEW .................. 24 EXPLODED VIEW PARTS LIST ..............25 REPLACEMENT PARTS LIST ............... 26 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

    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,LIST 10 page REMOCON NEC Code PAL/ NTSC AV Input Rear(option, NT), S-Vedio Input Rear Component input Rear (option, NT) PERI TV Connector Full SCART : 1 Rear (option,EU) RGB(VGA)Input D-sub 15 pin H/p input PC Sound input...
  • Page 8 6.Engineering Specification 6-1.General Specification(TV) Item Specification Remark Video input applicable system 1)PAL-D/K,B/G,I 2)NTSC-M 3)SECAM NTSC 4.43’ Receivable broadcasting system EU/Non-EU(RZ/RT) 1)PAL/SECAM BG (PAL Market) 2)PAL/SECAM DK 3)PAL I/I 4)SECAM L/L’ 5)NTSC M 6)PAL-N/M 7)NTSC M 7)NTSC Area(RM) RF input channel VHF : E2 ~ E12 UHF : E21 ~ E69 CATV : S1 ~ S20...
  • Page 9 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: 4: ID2(GND)
  • Page 10 6-3. Power Item Unit Remark Video Input Level 0.85 1.15 EN-50049 Audio Input Level NTSC:0.4Vrms(Typ) Audio Input Frequency Response Audio Input S/N Audio Input Distortion Audio Input Dynamic Range Video Output Level 0.85 1.15 Video Output Frequency Response Video Output S/N Audio Output Level Audio Output Frequency Response Audio Output S/N...

  • Page 11: Timing Chart

    TIMING CHART VIDEO SYNC << Dot Clock (MHz), Horizontal Frequency (kHz), Vertical Frequency (Hz), Horizontal etc... (µs), Vertical etc... (ms) >> Total Period Video Active Time Front Porch Sync Duration Back Porch Sync Mode Resolution Frequency Clock Sort Polarity 31.468 25.175 640x350 –...

  • Page 12: Adjustment Instruction

    ADJUSTMENT INSTRUCTION 1. Application Object 2.2.3 PC Mode adjustment 2.2.3.1 Adjustment preparation This instruction is for the application to the LCD TV. Conduct Heat Run at the RF fog signals for more than 2. Adjustment 30 minutes. 2.1 Adjustment overview Connect the Pattern Generator to 15 Pin D-Sub Jack of LCD TV.
  • Page 13 *Option(PAL) ITEM CONDITION REMARK ITEM CONDITION REMARK Option 1 Option 3 Side AV 0: Side AV Off Language 0: Eng Only 1: Side AV On 1: EU5 SCART 0: SCART Off 2: 12 nations(Europe) 1: SCART On 3: Eng + Chines 0: PC Off 4: Eng + Arab + Urdu 1: PC On...
  • Page 14 EDID ADJUSTMENT Windows EDID V1.0 User Manual 2. EDID Read & Write 1) Run WinEDID.exe Operating System: MS Windows 98, 2000, XP Port Setup: Windows 98 => Don’t need setup Windows 2000, XP => Need to Port Setup. This program is available to LCD Monitor only. 1.

  • Page 15: Svc Remocon

    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 16: 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 17 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 18 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 19 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 20 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 21: Block Diagram

    BLOCK DIAGRAM SIDE_AV POWER...
  • Page 22 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 23: Wiring Diagram

    LOCAL KEY IR_LED...

  • Page 25: Exploded View Parts List

    EXPLODED VIEW PARTS LIST PART NO. DESCRIPTION 3091V00593A CABINET ASSEMBLY RZ-15LA70 NON ML024E . 6304FLP133A LCD(LIQUID CRYSTAL DISPLAY), LC150X02-A4 LG PHILPS TFT COLOR TN,XGA,450NITS,8BITS LVDS 3809V00411C BACK COVER ASSEMBLY, RT-15LA70 1P/1D NON 3809TKB030D BACK COVER ASSEMBLY, RT-15LA70 3808V0433 40AF 3809TKB030C...

  • Page 26: 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 27 DATE: 2004. 06. 03. DATE: 2004. 06. 03. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C118 0CK104CK56A 0.1UF 1608 50V 10% R/TP X7R 0CC221CK41A 220PF 1608 50V 5% R/TP NP0 0CK104CK56A 0.1UF 1608 50V 10% R/TP X7R 0CC221CK41A...
  • Page 28 DATE: 2004. 06. 03. DATE: 2004. 06. 03. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION ZD211 0DZ510009EE UDZ S 5.1B TP ROHM-K SOD323 0LC1032101A 10UH 10% 3216 R/TC FI-C3216- D1151 0DZ330009DF MTZJ33B TP ROHM-K DO34 0.5W...
  • Page 29 DATE: 2004. 06. 03. DATE: 2004. 06. 03. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION 0RH1000D622 100 1/10W 5 D.R/TP 0RJ2701D677 2.7K OHM 1/10 W 5% 1608 R/TP 0RH1201D622 1.2K 1/10W 5 D.R/TP R230 0RJ7502D677...
  • Page 30 0RN2000F409 200 1/6W 1% TA52 ZD1207 0DZ620009HB UDZ S 6.2B TP ROHM SOD323 20 SW2200 140-313A TACT 2LEAD 100G(TA) LG C&D N ZD1212 0DZ620009HB UDZ S 6.2B TP ROHM SOD323 20 SW2201 140-313A TACT 2LEAD 100G(TA) LG C&D N ZD1213 0DZ620009HB UDZ S 6.2B TP ROHM SOD323 20...
  • Page 33 Jun., 2004 P/NO : 3828TSL103G Printed in Korea...

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