LG RT-42LZ30 Service Manual
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LG RT-42LZ30 Service Manual

LG RT-42LZ30 Service Manual

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LCD TV

SERVICE MANUAL

CHASSIS : CL-70
MODEL : RT-42LZ30
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-42LZ30

  • Page 1: Service Manual

    LCD TV SERVICE MANUAL CHASSIS : CL-70 MODEL : RT-42LZ30 CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
  • Page 2 CONTENTS CONTENTS ....................2 SAFETY PRECAUTIONS .................3 SVC PRECAUTIONS ................4 SPECIFICATION ..................6 ADJUSTMENT INSTRUCTION ..............9 SVC REMOCON ..................14 TROUBLE SHOOTING ................15 BLOCK DIAGRAM...................23 WRING .....................25 EXPLODED VIEW .................. 26 EXPLODED VIEW PARTS LIST ..............27 REPLACEMENT PARTS LIST ..............28 SVC. SHEET ....................- 2 -...

  • Page 3: Safety Precautions

    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 should be used to help reduce the incidence of component manual and its supplements and addenda, read and follow the damage caused by static by static electricity. SAFETY PRECAUTIONS on page 3 of this publication. 1.
  • Page 5 c. Quickly move the soldering iron tip to the junction of the Fuse and Conventional Resistor component lead and the printed circuit foil, and hold it there Removal/Replacement only until the solder flows onto and around both the 1. Clip each fuse or resistor lead at top of the circuit board hollow component lead and the foil.

  • Page 6: Specification

    This specification is applied to CL-70 chassis. 2. Requirement for Test 3. Test and Inspection method Testing for standard of each part must be followed in below (1) Capacity: Follow LG electronics TV Testing Standard. condition. (2) Another Required Standard EMI: Following CE Standard(EN55020) (1) Ambient Temperature : 25°C ±...
  • Page 7 6. Engineering Specification Item Content Remark Supported Sync Type Separate Sync, SOG, Composite Sync, Digital Operating Frequency Analog Horizontal 30 ~ 83 KHz Vertical 56 ~85 Hz Digital Horizontal 30 ~ 72 KHz Vertical 56 ~ 85 Hz Resolution Analog 1600 x 1200 @60Hz Recommend 1360 x 768 @60Hz...
  • Page 8 7. Special Function Contents Description Remark Audio Output Output 10W+10W Volume :Adjust Rating (Rated Out put ¡ 10%) Freq. Character 100Hz ~ 10KHz Range ( -3 dB ) T.H.D Within 10% Input Sensitivity 0.700Vrms More than 40dB Speaker Type Built-In Impedance 8¥...

  • Page 9: Adjustment Instruction

    ADJUSTMENT INSTRUCTION 1.Application Object 3.2. Color coordinates Adjustment and brightness Adjustment (AV input) These instructions are applied to all of the MODELS of 42" LCD 3.2.1 Color coordinates adjustment provisions: - Adjusting Each color coordinate and Black level - Input signal: The CVBS (576i), 576i (HDTV port), 1080i 2.
  • Page 10 3.3.3 H/V Position, Clock, Clock Phase and Auto Calibration 3.2.5.11. RS 232C operation check - Connect serial cable to RS232C -The Mode 13 (1280x768,60Hz) 1line from on/off pattern - It fixes speed of 115200BPS H/V Position and the Clock, Clock Phase it is variable - Send the instruction "...
  • Page 11 4. Manual and Automatic Equipment Adjustment Confirmation Standards: ITEM Adjustment and Mode of Operation Operation Measurement Measurement Standard Analog Digital Pattern Location Voltage (V) 24V¡ 5% MODE 14 Mode 14 Pattern 4 Each Power TP 12V¡ 5% 5V¡ 5% Video Level 0.7Vp.p MODE 1-17 MODE 1-15...

  • Page 12: Timing Chart

    TIMING CHART VIDEO SYNC << Dot Clock (MHz), Horizontal Frequency (kHz), Vertical Frequency (Hz), Horizontal etc... (µs), Vertical etc... (ms) >> Dot Clock Frequency Sync Total Display Sync Back Front MODE H / V Resolution Polarity Porch ( D ) [MHz] [kHz]/[Hz] Period( E )
  • Page 13 DTV Timing Chart Component Video Input (YPbPr) Resolution H-freq(kHz) V-freq(Hz) Proposed 720*576 31.2 HDTV 576i 720*576 31.2 HDTV 576P 1280*720 37.5 HDTV 720P 1920*1080 28.1 HDTV 1080i Reference OPTION 1 OPTION 2 Setting Value Sales Area TELETEXT ACMS I II SAVE 200PR Hidev Setting Value...

  • Page 14: Svc Remocon

    SVC REMOCON FUNTION REAMARK 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.

  • Page 15: Troubleshooting

    TROUBLESHOOTING 1. NO POWER NO POWER (POWER INDICATOR OFF) CHECK J601 VOLTAGE CHECK POWER BOARD (18V, 12V, 5V)? CHECK CHECK POWER BOARD J602 VOLTAGE (24V, 33V) ? CHECK X401 CHECK X401 (14.318MHz) ? CHECK CHECK MICOM(U402) J601 SUB POWER PORT(R634) (SUB POWER) ? CHECK KEY CONTROL BOARD...
  • Page 16 Waveforms J602-24V J602-12V X401-14.318MHz J601 - 16 -...
  • Page 17 2. NO RASTER(OSD IS NOT DISPLAYED) NO RASTER (OSD IS NOT DISPLAYED) CHECK THE PERIPHERAL CHECK U402? IC U402 CHECK CHECK THE PERIPHERAL LVDS OUTPUT J802 (J802)? CHECK INVERTER POWER CHECK U607 AND THE (J606, J607) ? PERIPHERAL IC U607 CHECK INVERTER - 17 -...
  • Page 18 3. NO RASTER ON VIDEO SIGNAL INPUT NO RASTER ON VIDEO SIGNAL POWER CHECK OF CXA2040(U201) : U204(9V) POWER CHECK OF UPD64011(U904) : U905(3.3V), U906(1.5V) POWER CHECK OF MDIN150(U901) : U907(3.3V), U908(2.5V) POWER CHECK OF GM1501(U402) CHECK CABLE OF VIDEO/COMPONENT NO INPUT SIGNAL CHECK UPD64011(U904)I/O CHECK THE PERIPHERAL...
  • Page 19 4. NO RASTER ON TV SIGNAL INPUT NO RASTER ON TV SIGNAL POWER CHECK OF TUNER(TU201) : L219(33V), L220(5V) POWER CHECK OF CXA2040(U201) : U204(9V) POWER CHECK OF UPD64011(U904) :U905(3.3V), U906(1.5V) POWER CHECK OF MDIN150(U901) :U907(3.3V), U908(2.5V) POWER CHECK OF GM1501(U402) CHECK CONNECTION OF TV TUNER AND ANTENNA CHECK TV CH...
  • Page 20 5. SOUND TROBLE SHOOTING NO SOUND OUTPUT POWER CHECK OF MSP3410G(U501) : U522(8V), L501(5V), L505(5V) POWER CHECK OF TPA3004(U502) : C564(18V) CHECK SOUND OF VCR,DVD,PC (TV)CHECK OF CONNECTION OF TUNER AND ANTENNA CHECK SOUND INPUT =>PC SOUND(J707) =>VIDEO, DVD, DTV SOUND (RED, WHITE OF J701, J702) CHECK THE PERIPHERAL IC OF NO INPUT SIGNAL...
  • Page 21 6. NO RASTER STATE ON ANALOG SIGNAL NO RASTER ON ANALOG SIGNAL POWER CHECK OF GM1501(U402) POWER CHECK OF LVDS OUTPUT: J802 CONNECTOR(J101) CHECK CHECK THE PERIPHERAL IC NO INPUT SIGNAL OF D-SUB(J101) CHECK ADC I/O SIGNAL IN GM1501(U402) NO OUTPUT SIGNAL CHECK THE PERIPHERAL IC NO INPUT SIGNAL OF GM1501(U402)
  • Page 22 7. NO RASTER STATE ON DIGITAL SIGNAL NO RASTER STATEON DIGITAL SIGNAL POWER CHECK OF GM1501(U402) POWER CHECK OF LVDS OUTPUT: J802 CONNECTOR(J102) CHECK NO INPUT SIGNAL CHECK GM1501(U402) I/O SIGNAL CHECK THE PERIPHERAL IC NO OUTPUT SIGNAL OF GM1501(U402) NO INPUT SIGNAL CHECK THE PERIPHERAL IC CHECK LVDS I/O SIGNAL...
  • Page 23 BLOCK DIAGRAM (upD64011+gm1501H) - 23 -...

  • Page 24: Block Diagram Description

    BLOCK DIAGRAM DESCRIPTION 1. Input Selection Circuit 6. De-interlacer 1) PC Input Selection This block is composed of MDIN150(U901) and peripheral This block is composed of GM1501(U402) and peripheral devices. devices. GM1501(U402) controls this IC through IIC Line. 2) Video Input Selection And this IC convert 16 Bit Interlaced Y/UV signal to De- This block is composed of Video S/W IC(CXA2040Q, interlace signal.

  • Page 25: Wiring Diagram

    WIRING DIAGRAM - 25 -...
  • Page 26 - 26 -...

  • Page 27: Exploded View Parts List

    CABINET ASSEMBLY, RT-42LZ30 BRAND 3090V00554 SET 3091TKE015K CABINET ASSEMBLY, RT-42LZ30 BRAND 3090V00554 SKD 6304FLP148A LCD(LIQUID CRYSTAL DISPLAY), LC420W02-B4K1 LG PHILPS TFT COLOR WXGA, 0.7T, NORMAL POL, 500NITS, H-H, WITH AI 3809TKE015N BACK COVER ASSEMBLY, RT-42LZ30 3808TKE009 40AF(V0) CL-70 FOR AUSTRAILIA SET 3809TKE015H...

  • Page 28: 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 29 DATE: 2004. 12. 24. DATE: 2004. 12. 24. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C669 0CH3104K566 0.1UF 50V 10% X7R 2012 R/TP C975 0CH3104K566 0.1UF 50V 10% X7R 2012 R/TP C673 0CH3104K566 0.1UF 50V 10% X7R 2012 R/TP C980...
  • Page 30 DATE: 2004. 12. 24. DATE: 2004. 12. 24. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C365 0CK104CK56A 0.1UF 1608 50V 10% R/TP X7R C565 0CK104CK56A 0.1UF 1608 50V 10% R/TP X7R C368 0CK104CK56A 0.1UF 1608 50V 10% R/TP X7R C566...
  • Page 31 DATE: 2004. 12. 24. DATE: 2004. 12. 24. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C269 0CC270DK41A 27PF 2012 50V 5% NP0 R/TP C228 0CE225VK6DC 2.2UF MV 50V 20% R/TP(SMD) S C270 0CC270DK41A 27PF 2012 50V 5% NP0 R/TP C233...
  • Page 32 0DRCE00018A "PACDN004SR,LF CAMD R/TP SOT1" U103 0DRCE00018A "PACDN004SR,LF CAMD R/TP SOT1" U105 0DRCE00018A "PACDN004SR,LF CAMD R/TP SOT1" U802 0ICTMLG018A LGDP4410 LG IC 176P TQFP TRA U106 0DRCE00018A "PACDN004SR,LF CAMD R/TP SOT1" U1003 0IFA752700A KA75270Z 3 TP RE-SET IC MC-0 U108 0DRCE00018A "PACDN004SR,LF CAMD R/TP SOT1"...
  • Page 33 DATE: 2004. 12. 24. DATE: 2004. 12. 24. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION L513 6140TBZ007E "SLF12575T-330M3R2,TDK SMD CH" L801 6210TCE001G HH-1M3216-501 CERATEC 3216MM L514 6140TBZ007E "SLF12575T-330M3R2,TDK SMD CH" L802 6210TCE001G HH-1M3216-501 CERATEC 3216MM L201...
  • Page 34 DATE: 2004. 12. 24. DATE: 2004. 12. 24. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION Q211 0TR387500AA CHIP 2SC3875S(ALY) BK KEC - RA804 0RHZTCZ001D RCA86TRJ22R0 SMART 22OHM 1/1 Q212 0TR150400BA CHIP 2SA1504S(ASY) BK KEC - RA805 0RHZTCZ001D RCA86TRJ22R0 SMART 22OHM 1/1...
  • Page 35 DATE: 2004. 12. 24. DATE: 2004. 12. 24. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R470 0RH0000D622 0 OHM 1 / 10 W 2012 5.00% D R1057 0RJ0000D677 0 OHM 1/10 W 5% 1608 R/TP R478 0RH0000D622 0 OHM 1 / 10 W 2012 5.00% D R1058...
  • Page 36 DATE: 2004. 12. 24. DATE: 2004. 12. 24. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R228 0RJ1000D677 100 OHM 1/10 W 5% 1608 R/TP R436 0RJ0000D677 0 OHM 1/10 W 5% 1608 R/TP R229 0RJ1000D677 100 OHM 1/10 W 5% 1608 R/TP...
  • Page 37 DATE: 2004. 12. 24. DATE: 2004. 12. 24. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R529 0RJ1002D677 10K OHM 1/10 W 5% 1608 R/TP R712 0RJ0822D677 82 OHM 1/10 W 5% 1608 R/TP R530 0RJ1001D677 1K OHM 1/10 W 5% 1608 R/TP...

  • Page 38: Control Board

    0DZ560009DA UDZ S 5.6B TP ROHM-K SOD323 CONTROL BOARD 0DZ560009DA UDZ S 5.6B TP ROHM-K SOD323 6726VV0006J TSOP2238MQ1 VISHAY 38KHZ MC0 140-313B TACT 2LEAD 160G(TA) LG C&D N 140-313B TACT 2LEAD 160G(TA) LG C&D N 140-313B TACT 2LEAD 160G(TA) LG C&D N 140-313B TACT 2LEAD 160G(TA) LG C&D N...
  • Page 42 Dec., 2004 P/NO : 3828TSL106J Printed in Korea...

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