LG 42LC7D Service Manual
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LG 42LC7D Service Manual

Lcd tv
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See also: Owner's Manual
LCD TV

SERVICE MANUAL

CHASSIS : LB73A
MODEL : 42LC7D
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
42LC7D-AB
R
website:http://biz.LGservice.com

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  • Page 1: Service Manual

    LCD TV SERVICE MANUAL CHASSIS : LB73A MODEL : 42LC7D 42LC7D-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 ................13 BLOCK DIAGRAM...................19 EXPLODED VIEW .................. 21 REPLACEMENT PARTS LIST ............... 23 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

    34.40MHz(Sound) 2) DVB-T : 36.125MHz Input Voltage AC 240 V, 50Hz Maker : LGE LCD Module 37" : LC370WX3-SLA1 WXGA Maker : LG Philips LCD 42" : LC420WX6-SLA1 WXGA Aspect ratio 16:9 (wide) Operating Temperature Operating Humidity Storage Temperature Storage Humidity...
  • Page 7 5. Chroma & Brightnes Item Unit Remark White peak Brightness cd/m HDMI input, full white, Video Black level=Hight Contrast Ratio 600 : 1 800 : 1 Brightness uniformity Refer to LCD spec. Color coordinate 0.633 ± 0.03 0.339 ± 0.03 GREEN 0.286 ±...
  • Page 8 7. RGB input (PC) Resolution H-freq(kHz) V-freq.(kHz) Pixel clock(MHz) Remarks 640*350 31.468 70.09 25.17 640*480 31.469 59.94 25.17 VESA(VGA) 640*480 37.861 72.80 31.50 VESA(VGA) 640*480 37.500 75.00 31.50 VESA(VGA) 800*600 35.156 56.25 36.00 VESA(SVGA) 800*600 37.879 60.31 40.00 VESA(SVGA) 800*600 48.077 72.18 50.00...

  • Page 9: Adjustment Instruction

    ADJUSTMENT INSTRUCTION 1. Application Object These instructions are applied to all of the 37"/42" LCD TV, LB73A Chassis 2. Notes (1) Because this is not a hot chassis, it is not necessary to use an isolation transformer. However, the use of isolation transformer will help protect test equipment.
  • Page 10 5. Video(uPD)-Set adjustment 6. EDID (The Extended Display Identification Data) /DDC Download (Display Data Channel) 5-1. Synopsis This is a adjustment to reduce the color difference of video This is the function that enables “Plug and Play". signal Main/Sub Display. 5-2.

  • Page 11: Edid Data

    6-2. Setting of Device 6-3-2. 42LC7D-AB (1) EDID DATA PORT1 for HDMI 6-3. EDID DATA 6-3-1. 37LC7D-AB 0 00 FF FF FF FF FF FF 00 1E 6D 01 00 01 01 01 01 (1) EDID DATA PORT1 for HDMI...
  • Page 12 7. Adjustment of White Balance 7-4. 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 13: Trouble Shooting

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  • Page 19: Block Diagram

    BLOCK DIAGRAM HD2_ICE958_OUT SPDI HD2_DAC_SCLK HD2_DAC_LRCLK SPDIF HD2_ICE958_IN - 19 -...
  • Page 20 MEMO - 20 -...

  • Page 21: Exploded View

    EXPLODED VIEW 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 EXPLODED VIEW. 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 22: Replacement Parts List

    REPLACEMENT PARTS LIST DATE: 2007. 05. 08. LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION ACCESSORY C1318 0CE106WFKDC "Capacitor,AL,Chip" MVK4.0TP16VC10M 10uF 2 C1400 0CE106WFKDC "Capacitor,AL,Chip" MVK4.0TP16VC10M 10uF 2 MFL37734801 "Manual,Owners" PRINTING USER LB73A BR C1401 0CE106WFKDC "Capacitor,AL,Chip"...
  • Page 23 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C541 EAE30840401 "Capacitor,AL,Chip" 25SVPD10M 10uF 20% 25V C1012 0CK104BF56A "Capacitor,Ceramic,Chip" C1005X7R104KET 100nF 1 C547 0CE476WF6DC "Capacitor,AL,Chip" MVK6.3TP16VC47M 47uF 2 C1013 0CK102BK56A "Capacitor,Ceramic,Chip" 0402B102K500CT 1nF 10% C547 EAE30840401 "Capacitor,AL,Chip"...
  • Page 24 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C116 0CH5220K618 "Capacitor,Ceramic,Chip" 0402N220M500LT 22pF 5% C1308 0CK104BF56A "Capacitor,Ceramic,Chip" C1005X7R104KET 100nF 1 C117 0CK104BF56A "Capacitor,Ceramic,Chip" C1005X7R104KET 100nF 1 C1309 0CK104BF56A "Capacitor,Ceramic,Chip" C1005X7R104KET 100nF 1 C118 0CH5220K618 "Capacitor,Ceramic,Chip"...
  • Page 25 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C212 0CK104BF56A "Capacitor,Ceramic,Chip" C1005X7R104KET 100nF 1 C417 0CK104BF56A "Capacitor,Ceramic,Chip" C1005X7R104KET 100nF 1 C213 0CK104BF56A "Capacitor,Ceramic,Chip" C1005X7R104KET 100nF 1 C418 0CK104BF56A "Capacitor,Ceramic,Chip" C1005X7R104KET 100nF 1 C214 0CK104BF56A "Capacitor,Ceramic,Chip"...
  • Page 26 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C474 0CK103BH56A "Capacitor,Ceramic,Chip" C1005X7R1E103KT- 10nF C606 0CH5220K618 "Capacitor,Ceramic,Chip" 0402N220M500LT 22pF 5% C475 0CK103BH56A "Capacitor,Ceramic,Chip" C1005X7R1E103KT- 10nF C607 0CH5220K618 "Capacitor,Ceramic,Chip" 0402N220M500LT 22pF 5% C476 0CK103BH56A "Capacitor,Ceramic,Chip" C1005X7R1E103KT- 10nF C618 0CK225DD66A "Capacitor,Ceramic,Chip"...
  • Page 27 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C754 0CK104BF56A "Capacitor,Ceramic,Chip" C1005X7R104KET 100nF 1 C919 0CK104BF56A "Capacitor,Ceramic,Chip" C1005X7R104KET 100nF 1 C756 0CK104BF56A "Capacitor,Ceramic,Chip" C1005X7R104KET 100nF 1 C920 0CK104BF56A "Capacitor,Ceramic,Chip" C1005X7R104KET 100nF 1 C757 0CK104BF56A "Capacitor,Ceramic,Chip"...
  • Page 28 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C977 0CK104BF56A "Capacitor,Ceramic,Chip" C1005X7R104KET 100nF 1 ZD612 0DZ560009DA "Diode,Zener" UDZS5.6B 5.6V 5.49TO5. C978 0CK104BF56A "Capacitor,Ceramic,Chip" C1005X7R104KET 100nF 1 ZD613 0DZ560009DA "Diode,Zener" UDZS5.6B 5.6V 5.49TO5. C984 0CK104BF56A "Capacitor,Ceramic,Chip"...
  • Page 29 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION IC500 0IMMR00230A "IC,SDRAM" M12L64164A-5TG 64MBIT L400 0LCML00003B "Filter,Bead" MLB-201209-0120P-N2 12 IC501 0IMMR00230A "IC,SDRAM" M12L64164A-5TG 64MBIT L401 0LCML00003B "Filter,Bead" MLB-201209-0120P-N2 12 IC502 0IMMR00230A "IC,SDRAM" M12L64164A-5TG 64MBIT L402 0LCML00003B "Filter,Bead"...
  • Page 30 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION FL605 EAM37276902 "Filter,LCR" LCF20P101-TM LPF(EMI) Q604 0TR387500AA "TR,Bipolar" 2SC3875S(ALY) NPN 5V 6 FL606 EAM37276902 "Filter,LCR" LCF20P101-TM LPF(EMI) Q605 0TR387500AA "TR,Bipolar" 2SC3875S(ALY) NPN 5V 6 FL607 EAM37276902 "Filter,LCR"...
  • Page 31 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION 0RD1101F509 "Resistor,Carbon Film" RD-96T1G1K10 1.1KOHM 2 R103 0RJ0000C678 "Resistor,Chip" MCR01MZPJ000 0OHM 5% 1 0RD0101F609 "Resistor,Carbon Film" RD-96T1J1R00 1OHM 5% 1 R1030 0RJ0000C678 "Resistor,Chip" MCR01MZPJ000 0OHM 5% 1 0RD9101F609 "Resistor,Carbon Film"...
  • Page 32 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R1136 0RJ2200C678 "Resistor,Chip" MCR01MZPJ221 220OHM 5% R1225 0RJ4701C678 "Resistor,Chip" MCR01MZPJ472 4.7KOHM 5 R1137 0RJ2200C678 "Resistor,Chip" MCR01MZPJ221 220OHM 5% R1226 0RJ0222C678 "Resistor,Chip" MCR01MZPJ220 22OHM 5% R1138 0RJ2200C678 "Resistor,Chip"...
  • Page 33 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R141 0RJ0000C678 "Resistor,Chip" MCR01MZPJ000 0OHM 5% 1 R1466 0RJ0222C678 "Resistor,Chip" MCR01MZPJ220 22OHM 5% R1410 0RJ2701C678 "Resistor,Chip" MCR01MZPJ272 2.7KOHM 5 R1467 0RJ0222C678 "Resistor,Chip" MCR01MZPJ220 22OHM 5% R1411 0RJ2701C678 "Resistor,Chip"...
  • Page 34 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R215 0RJ0000C678 "Resistor,Chip" MCR01MZPJ000 0OHM 5% 1 R2730 0RJ0752C678 "Resistor,Chip" MCR01MZPJ750 75OHM 5% R217 0RJ0000C678 "Resistor,Chip" MCR01MZPJ000 0OHM 5% 1 R2731 0RJ0332C678 "Resistor,Chip" MCR01MZPJ330 33OHM 5% R220 0RJ4701C678 "Resistor,Chip"...
  • Page 35 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R3076 0RJ4701C678 "Resistor,Chip" MCR01MZPJ472 4.7KOHM 5 R3142 0RJ0222C678 "Resistor,Chip" MCR01MZPJ220 22OHM 5% R3077 0RJ4701C678 "Resistor,Chip" MCR01MZPJ472 4.7KOHM 5 R3143 0RJ0222C678 "Resistor,Chip" MCR01MZPJ220 22OHM 5% R3078 0RJ4701C678 "Resistor,Chip"...
  • Page 36 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R495 0RJ4701C678 "Resistor,Chip" MCR01MZPJ472 4.7KOHM 5 R645 0RJ0752C678 "Resistor,Chip" MCR01MZPJ750 75OHM 5% R496 0RJ4701C678 "Resistor,Chip" MCR01MZPJ472 4.7KOHM 5 R648 0RJ0752C678 "Resistor,Chip" MCR01MZPJ750 75OHM 5% R498 0RJ0332C678 "Resistor,Chip"...
  • Page 37 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R745 0RJ0222C678 "Resistor,Chip" MCR01MZPJ220 22OHM 5% R828 0RJ0000C678 "Resistor,Chip" MCR01MZPJ000 0OHM 5% 1 R746 0RJ0222C678 "Resistor,Chip" MCR01MZPJ220 22OHM 5% R828 0RJ0471C678 "Resistor,Chip" MCR01MZPJ4R7 4.7OHM 5% R747 0RJ0222C678 "Resistor,Chip"...
  • Page 38 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R963 0RJ0000C678 "Resistor,Chip" MCR01MZPJ000 0OHM 5% 1 VR705 6102W5V016A Varistor AVRL161A1R1NT 10V 30% R964 0RJ4701C678 "Resistor,Chip" MCR01MZPJ472 4.7KOHM 5 CONNECTOR R965 0RJ1001C678 "Resistor,Chip" MCR01MZPJ102 1KOHM 5% R966 0RJ4702C678 "Resistor,Chip"...
  • Page 39 ARM CPU/EEPROM FLASH/SDRAM/0Delay BUF +3.3V +3.3V 3.3VDD_CPU 3.3VDD_CPU 2.5VDD_CPU LDATA[0-31] LDATA[0-31] LDATA[0-31] L100 FLASH_DOWN MLB-201209-0120P-N2 LADDR[2-24] LADDR[2-24] C113 C114 C115 3.3VDD_FLASH 3.3VDD_SDRAM 3.3VDD_SDRAM 47uF 0.01uF Q100 0.1uF 2SC3875S +3.3V IC202 HY57V641620ETP-6 3.3VDD_CPU 2.5VDD_CPU $ 0.06 IC200 0.1uF C204 VDD1 VSS3 IC102 MX29LV320CTTC-70G MIC39100...
  • Page 40 HD2 MEMORY/PLL Circuit External Jack 3.3VDD_SDRAM_1 3.3VDD_SDRAM_1 +5.0V HD2_MEM_DATA[0-63] C510 10uF C525 +5.0V IC600 10uF R635 AT24C02BN-10SU-1.8 AV2_S_SW R637 IC500 IC502 Q601 2SC3875S +3.3V M12L64164A-5TG M12L64164A-5TG SIDE AV FL603 +5.0V C507 VDD_1 VSS_3 C522 VDD_1 VSS_3 R606 R600 C600 DQ15 DQ15 Q600 TENSION...
  • Page 41 VH_Y/G[0-9] MAIN VIDEO DECODER VH_C/B[0-9] LVDS VH_C/B[0-9] XDR_DATA_B[0-9] +3.3V_UPD_MAIN_D XDR_DATA_R[0-9] XDR_DATA_G[0-9] +1.5V_UPD_MAIN +3.3V_LVDS Place close to Vcc Pin +3.3V_UPD_MAIN_A1 +5.0V +3.3V_LVDS L1003 MLB-201209-0120P-N2 IC902 XDR_DATA_B[4] R1002 AZ1117H-3.3 C942 C1014 C1021 1000pF C941 INPUT 1 ADJ/GND 10uF C1005 22uF 10uF $0.06 0.1uF +1.5V_UPD_MAIN +3.3V_UPD_MAIN_A1...
  • Page 42 Digital Audio Out(TO MSP4450_M,MSP4450_S) HA_DAC_SCK SUB MICOM SPDIF OUT HA_DAC_LRCK HA_DAC_LRCH Digital Audio In (TO HD2_LINE_IN,PVR_BD) Delete Buffer R1327 SCL_CH4 +5V_ST AUDIO_IN_SCLK R1328 AUDIO_IN_LRCLK SDA_CH4 $ 0.06 AUDIO_IN_LRCH 8415_RESET 3.3VST_MICOM IC1403 AZ1117H-3.3 3.3VST_MICOM R1316 HD2_DAC_SCLK HA_DAC_SCK AC_EMPH INPUT 1 ADJ/GND R1317 SPDIF_ERROR HD2_DAC_LRCLK...
  • Page 43 Apr., 2007 P/NO : MFL38133701 Printed in Korea...

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