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LG 32LC7D Service Manual
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LG 32LC7D Service Manual

LG 32LC7D Service Manual

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LCD TV

SERVICE MANUAL

CHASSIS : LB73A
MODEL : 32LC7D
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
32LC7D-AB
R
website:http://biz.LGservice.com

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  • Page 1: Service Manual

    LCD TV SERVICE MANUAL CHASSIS : LB73A MODEL : 32LC7D 32LC7D-AB CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Table Of Contents

    CONTENTS CONTENTS ....................2 SAFETY PRECAUTIONS ................3 SPECIFICATION ..................6 ADJUSTMENT INSTRUCTION ..............9 TROUBLE SHOOTING ................12 BLOCK DIAGRAM...................16 EXPLODED VIEW .................. 18 REPLACEMENT PARTS LIST ............... 20 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 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

    Input Voltage AC 240 V, 50Hz Maker : LGE LCD Module 26" : T260XW03 (1366x768) Maker : AU Optronics Corp. 32" : LC320WX4SLD2 WXGA Maker : LG Philips LCD Aspect ratio 16:9 (wide) Operating Temperature Operating Humidity Storage Temperature Storage Humidity...
  • Page 7 5. Chroma & Brightness Item Unit Remark White peak Brightness cd/m HDMI input(255level) cd/m RF/AV/COMP/RGB input (255 level) Contrast Ratio 600 : 1 800 : 1 HDMI input 500 : 1 700 : 1 RF/AV/COMP/RGB input Brightness uniformity Refer to LCD spec. Color coordinate 0.635 ±...
  • Page 8 8. RGB, HDMI/DVI input (DTV / PC) Resolution H-freq(kHz) V-freq.(kHz) Pixel clock(MHz) Remarks 720*576 31.25 50.00 27.00 SDTV 576p 720*480 31.47/31.50 59.94/60.00 27.00 SDTV 480p 1280*720 44.96/45.00 59.94/60.00 74.25 HDTV 720P 1280*720 37.50 50.00 74.25 HDTV 720P 1920*1080 33.72/33.75 59.94/60.0 74.25 HDTV 1080i 1920*1080...

  • Page 9: Adjustment Instruction

    ADJUSTMENT INSTRUCTION 1. Application Object 4-3. Adjustment (1) How to adjustment the Component1 These instructions are applied to all of the 32" LCD TV, 1) Select Component1 as the input with Color Bar Pattern LB73A Chassis in 480i 60Hz mode and select ‘Component1’ on screen. 2) After receiving signal for at least 1 second, press the 2.

  • Page 10: Edid Data

    5-3. Adjustment 6-3. EDID DATA (1) How to adjustment the uPD PAL (1) EDID DATA PORT1 for HDMI 1) Select AV1 as the input with 100% 8 Color Bar Pattern in PAL mode and select ‘AV1’ on screen. 0 00 FF FF FF FF FF FF 00 1E 6D 01 00 01 01 01 01 2) After receiving signal for at least 1 second, press the 10 0E 10 01 03 80 73 41 96 0A CF 74 A3 57 4C B0 23 ADJ Key on the Service R/C to enter the ‘Ez - Adjust’...
  • Page 11 7-4. Adjustment of White Balance 7. Adjustment of White Balance (Passivity Adjustment) 7-1. Required Equipment Operate Zero Calibration of the CA-210. Manual adjustment is also possible by the following sequence. (1) Color analyzer (CA-210 or similar product) (2) Automatic adjustor (with automatic adjustment hour (1) Enter to ‘7.

  • Page 12: Troubleshooting

    TROUBLESHOOTING 1. Power Board 1-1. The whole flowchart which it follows in voltage output state Start check Doesn't the Is it identical Is the Interface screen whole come with Power Off signal operated? out? condition? 1. Check the Power Off 2.
  • Page 13 2. In case of occurring strange screen into specific mode 2-1. In case the OSD does not displayed (1) Symptom 1) LED is white. 2) Some discharge on Panel becomes accomplished continuously. (2) Check following Is the LVDS cable Is the LVDS cable Replace the cable.
  • Page 14 2-2. In case of does’t display the screen into specific mode (1) Symptom 1) The screen does not become the display from specific input mode. (RF, AV, Component, RGB, DVI) (2) Check following 1) Check the all input mode should become normality display. 2) Check the Video(Main)/Data(Sub), Video(Main)/Video(Sub) should become normality display from the PIP mode or DW mode.(Re-Check using Swap function) Check the NEC64015(IC701) if the main picture is abnormal, and...
  • Page 15 (5) When Component or RGB-DTV/ PC mode is abnormal Is the CXA2151Q(IC500) Is the Input voltage, IIC Communication Replace the IC. normal? and HV sync normal? Is the MST3362(IC604) Is the Input voltage, IIC Communication Replace the IC. normal? and HV sync normal? Is the Input voltage, IIC Communication Is the Scaler normal? Replace the IC.
  • Page 16 3. When sound is abnormal (1) Symptom 1) LED is green. 2) Screen display but sound is not output. (2) Check following Is the SPK cable Is the SPK cable Replace SPK cable. normal? connected well? Cable inserts well. Is the Flat cable Cable inserts well.

  • Page 17: Block Diagram

    BLOCK DIAGRAM HD2_ICE958_OUT SPDI HD2_DAC_SCLK HD2_DAC_LRCLK SPDIF HD2_ICE958_IN - 17 -...

  • Page 18: Exploded View

    EXPLODED VIEW - 18 -...

  • Page 19: Exploded View Parts List

    EBR36994701 PCB Assembly SUB T.T LB73A 32LC7D-AB . Control Key Total Assy EBR36994702 PCB Assembly SUB T.T LB73A 32LC7D-AB KAUVLJD Control Key Total Assy FOR CKD LGEIN EAY34795001 Power Supply Assembly LGIT_32inch FREE Tornado 32inch LCD LGIT LCD Tornado 32inch EBR36906001 PCB Assembly SUB T.T LB73A 32LC7D-AB .

  • Page 20: Replacement Parts List

    REPLACEMENT PARTS LIST DATE: 2007. 05. 09. LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION CAPACITORs C1108 0CC560BK41A C1005C0G1H560JT 56pF 5% 50V C0G -55TO+125C C1109 0CC560BK41A C1005C0G1H560JT 56pF 5% 50V C0G -55TO+125C 0CH5101K416 C2012C0G1H101JT 100pF 5% 50V C0G -55TO+125 C111 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R -55TO+125...
  • Page 21 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C1307 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R -55TO+125 C1208 0CK105CD56A C1608X7R1A105KT 1uF 10% 10V X7R -55TO+125C C1209 0CZZB00035A GRM1555C1H330J 33pF 5% 50V C0G -55TO+125C C1308 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R -55TO+125 C121 0CE476WF6DC...
  • Page 22 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C324 0CC100BKF1A 0402N100J500LT 10pF 5% 50V C0G -55TO+125C C1521 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R -55TO+125 C1523 0CK103BH56A C1005X7R1E103KT- 10nF 10% 25V X7R -55TO+12 C325 0CE106WFKDC MVK4.0TP16VC10M 10uF 20% 16V 16MA -40TO+10 C1524 0CK103BH56A...
  • Page 23 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C489 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R -55TO+125 C434 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R -55TO+125 C435 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R -55TO+125 C490 0CE226WJ6DC MVK6.3TP35VC22M 22uF 20% 35V 40MA -40TO+85 C436 0CK104BF56A...
  • Page 24 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C733 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R -55TO+125 C600 0CE476WF6DC MVK6.3TP16VC47M 47uF 20% 16V 80MA -40TO+10 C601 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R -55TO+125 C734 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R -55TO+125 C602 0CK101BK4EA...
  • Page 25 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C939 EAE32166101 CS1005XR473K250CR 0.047uF 10% 25V X7R -55T C824 0CE227SF6DC MVG6.3TP16VC220M 220uF 20% 16V 130MA -40TO C824 0CE227WF6DC MVK8.0TP16VC220M 220uF 20% 16V 80MA -40TO+ C940 0CK103BH56A C1005X7R1E103KT- 10nF 10% 25V X7R -55TO+12 C825 0CK102BK56A...
  • Page 26 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION ZD624 0DZ560009DA UDZS5.6B 5.6V 5.49TO5.73V 60OHM 200MW SOD3 C994 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R -55TO+125 ZD625 0DZ560009DA UDZS5.6B 5.6V 5.49TO5.73V 60OHM 200MW SOD3 DIODEs ZD626 0DZ560009DA UDZS5.6B 5.6V 5.49TO5.73V 60OHM 200MW SOD3 ZD627...
  • Page 27 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION AR1000 EBC32260405 MNR04M0APJ680 68OHM 5% 1/16W 4 SMD R/TP 8P IC802 0IPMGA0010A AZ1117H-3.3 4.75TO10V 3.3V 0W SOT223 R/TP IC900 0ISA721700C LA7217M 4.5VTO5.5V 16.1KHZ 150MW 0F MFP R/ AR1001 0RJ0222C692 MNR04 M0APJ 220 22OHM 5% 1/16W 1005X4 R/TP...
  • Page 28 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R109 0RJ0000C678 MCR01MZPJ000 0OHM 5% 1/16W 1005 R/TP ROHM AR800 0RJ0222C692 MNR04 M0APJ 220 22OHM 5% 1/16W 1005X4 R/TP AR801 0RJ0222C692 MNR04 M0APJ 220 22OHM 5% 1/16W 1005X4 R/TP R110 0RJ0000C678 MCR01MZPJ000 0OHM 5% 1/16W 1005 R/TP ROHM...
  • Page 29 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R1313 0RJ4702C678 MCR01MZPJ473 47KOHM 5% 1/16W 1005 R/TP RO R1157 0RJ4703C678 MCR01MZPJ474 470KOHM 5% 1/16W 1005 R/TP - R1158 0RJ1001C678 MCR01MZPJ102 1KOHM 5% 1/16W 1005 R/TP ROH R1314 0RJ4701C678 MCR01MZPJ472 4.7KOHM 5% 1/16W 1005 R/TP R...
  • Page 30 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R156 0RJ0000C678 MCR01MZPJ000 0OHM 5% 1/16W 1005 R/TP ROHM R1433 0RJ0222C678 MCR01MZPJ220 22OHM 5% 1/16W 1005 R/TP - R R1434 0RJ0000C678 MCR01MZPJ000 0OHM 5% 1/16W 1005 R/TP ROHM R157 0RJ0000C678 MCR01MZPJ000 0OHM 5% 1/16W 1005 R/TP ROHM...
  • Page 31 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R3011 0RJ0000C678 MCR01MZPJ000 0OHM 5% 1/16W 1005 R/TP ROHM R2633 0RJ4703C678 MCR01MZPJ474 470KOHM 5% 1/16W 1005 R/TP - R2634 0RJ0682C678 MCR01MZPJ680 68OHM 5% 1/16W 1005 R/TP ROH R3012 0RJ0222C678 MCR01MZPJ220 22OHM 5% 1/16W 1005 R/TP - R...
  • Page 32 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R417 0RJ0222C678 MCR01MZPJ220 22OHM 5% 1/16W 1005 R/TP - R R3101 0RJ4700C678 MCR01MZPJ471 470OHM 5% 1/16W 1005 R/TP RO R3102 0RJ4701C678 MCR01MZPJ472 4.7KOHM 5% 1/16W 1005 R/TP R R418 0RJ0222C678 MCR01MZPJ220 22OHM 5% 1/16W 1005 R/TP - R...
  • Page 33 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R677 0RJ1000C678 MCR01MZPJ101 100OHM 5% 1/16W 1005 R/TP RO R535 0RJ0222C678 MCR01MZPJ220 22OHM 5% 1/16W 1005 R/TP - R 0RD3301F609 RD-96T1J3K30 3.3KOHM 5% 1/6W 3.2X1.8MM NON R680 0RJ1000C678 MCR01MZPJ101 100OHM 5% 1/16W 1005 R/TP RO...
  • Page 34 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R851 0RJ2001C678 MCR01MZPJ202 2KOHM 5% 1/16W 1005 R/TP ROH R762 0RJ0000C678 MCR01MZPJ000 0OHM 5% 1/16W 1005 R/TP ROHM R763 0RJ1002C678 MCR01MZPJ103 10KOHM 5% 1/16W 1005 R/TP RO R852 0RJ2001C678 MCR01MZPJ202 2KOHM 5% 1/16W 1005 R/TP ROH...
  • Page 35 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION L1508 6210TCE001X Filter,Bead HU-1H4532-121JT 120OHM 4.5X3.2X1.3MM FL1402 EAM37276902 Filter,LCR LCF20P101-TM LPF(EMI) 100MHZ FL1403 EAM37276902 Filter,LCR LCF20P101-TM LPF(EMI) 100MHZ L1509 6210TCE001X Filter,Bead HU-1H4532-121JT 120OHM 4.5X3.2X1.3MM FL1406 EAM37276902 Filter,LCR LCF20P101-TM LPF(EMI) 100MHZ L1510 6210TCE001X...
  • Page 36 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION CONNECTORs SW300 6600VR1004A SKHMPWE010 1C1P 12VDC 0.05A HORIZONTAL CN300 6630G00001C KCN-DS-1-0088 D-SUB 9P 2.77MM STRAIGHT MAL OTHERs J600 6630TGA004K KCN-DS-1-0089 D-SUB 15P 2.29MM STRAIGHT FE 6602T20009C SMAW200-04P 4P 2.00MM 1R ANGLE DIP ST NATU 6712000013A Receiver Module TSOP4438SO1 4.5TO5.5V 1.5MA...
  • Page 37 HD2_MEM_DATA[0-63] HD2_MEM_DATA[0-63] HD2_MEM_DATA[0-63] +5V_TU 1.8V Regulator for HD2.4 Digital Power 1 TUNER HD2_MEM_BA1 HD2_MEM_BA0 HD2_MEM_CS 1.8V Regulator for HD2.4 Analog Power HD2_MEM_WE +3.3V HD2_MEM_RAS +1.8V_TU +3.3V_TU HD2_MEM_CAS HD2_MEM_CLK2 HD2_MEM_CLK2 IC400 HD2_MEM_CLK1 HD2_MEM_CLK1 +3.3V AZ1117H-1.8TRE1(EH13A) HD2_MEM_ADDR[0-11] +1.8V_HD2_DIGITAL_D1 +1.8V_HD2_DIGITAL_D1 HD2_MEM_ADDR[0-11] HD2_MEM_ADDR[0-11] INPUT 1ADJ/GND +6.0V IC403...
  • Page 38 HDMI2 3.3VDD_SDRAM_1 3.3VDD_SDRAM_1 J700 +3.3V DC1R019WDH +3.3V_MST +3.3V_VDDP +3.3V_MST +3.3V_VDVI +3.3V_MST +3.3V_VADC +3.3V_MST +3.3V_VMPLL +3.3V_MST +3.3V_VPLL +2.5V_MST +2.5V_VAUPLL +2.5V_MST +2.5V_VDDC R2705 L700 L703 L704 L706 L707 L708 L709 TMDS0_RX2+ MLB-201209-0120P-N2 MLB-201209-0120P-N2 MLB-201209-0120P-N2 MLB-201209-0120P-N2 MLB-201209-0120P-N2 MLB-201209-0120P-N2 HD2_MEM_DATA[0-63] C510 MLB-201209-0120P-N2 R2706 10uF C525 TMDS0_RX2- 10uF...
  • Page 39 SUB MICOM Digital Audio Out(TO MSP4450_M,MSP4450_S) HA_DAC_SCK HA_DAC_LRCK HA_DAC_LRCH SPDIF OUT +5V_ST $ 0.06 Digital Audio In (TO HD2_LINE_IN,PVR_BD) Delete Buffer R1327 IC1403 SCL_CH4 3.3VST_MICOM AUDIO_IN_SCLK AZ1117H-3.3 3.3VST_MICOM R1328 AUDIO_IN_LRCLK SDA_CH4 INPUT AUDIO_IN_LRCH 1ADJ/GND 8415_RESET C1414 C1415 22uF 0.1uF OUTPUT R1316 IC1401 L1407...
  • Page 40 Apr., 2007 P/NO : MFL38133703 Printed in Korea...

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