LG 37LC7D Service Manual
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LG 37LC7D Service Manual

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See also: Owner's Manual
LCD TV

SERVICE MANUAL

CHASSIS : LA73E
MODEL : 37LC7D
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
37LC7D-UB
R

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Summary of Contents for LG 37LC7D

  • Page 1: Service Manual

    LCD TV SERVICE MANUAL CHASSIS : LA73E MODEL : 37LC7D 37LC7D-UB CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Table Of Contents

    CONTENTS CONTENTS ....................2 PRODUCT SAFETY ..................3 SPECIFICATION ..................6 ADJUSTMENT INSTRUCTION..............11 TROUBLE SHOOTING & BLOCK DIAGRAM ........17 EXPLODED VIEW .................. 43 REPLACEMENT PARTS LIST ............... 45 SVC. SHEET ....................- 2 -...

  • 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 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

    Screen Size 26 inch Wide – 26 inches(582.96mm) For 26LC7D-UB 32 inch Wide - 31.51inches(800.4mm) For 32LC7D-UB,32LC4D-UA 37 inch Wide – 32.02 inches(940.3mm) For 37LC7D-UB 42 inch Wide – 42.02 inches(1067.308mm) For 42LC7D-UB,42LC4D-UA Aspect Ratio 16:9 Tuning System LCD Module...
  • Page 7 5. Chroma & Brightness 5-1. 37LC7D-UB CONDITION : EZ-Picture "Daylight" Item Unit Remark White peak brightness cd/m HDMI input, full white, Video Black level=High Contrast ratio 700:1 900:1 Non dimming mode (PC Mode) 3000:1 4000:1 5000:1 Dimming mode 1. Input full black, wait 10 minute, measure black level 2.
  • Page 8 6. Component Video Input (Y, P Specification Remark Resolution H-freq(kHz) V-freq(Hz) 720*480 15.73 59.94 SDTV ,DVD 480I 720*480 15.73 60.00 SDTV ,DVD 480I 720*480 31.47 59.94 SDTV 480P 720*480 31.50 60.00 SDTV 480P 1280*720 44.96 59.94 HDTV 720P 1280*720 45.00 60.00 HDTV 720P 1920*1080...
  • Page 9 8. Mechanical specification 1) 37LC7D Item Content Unit Remark Product Widt(W) Length(D) Height(H) Dimension Before Packing 280.5 692.8 With Stant After Packing Product Only SET With BOX 2) 42LC7D Item Content Unit Remark Product Widt(W) Length(D) Height(H) Dimension Before Packing 1033.4...
  • Page 10 9. Customer Menu Setup (Shipment Condition) Item Condition Remark Input Mode TV02CH Volume Level Mute Aspect Ratio 16:9 Video EZ Picture Daylight Contrast Brightness Color Sharpness Tint Color-temperature Cool Auto(On) Advanced Cinema3:2 Mode(Off) Black Level(RF,HDMI=>Low),(AV=>High)( RGB-PC,Component=>Disable) Audio Audio Language EZ Sound Normal Balance Bass...

  • Page 11: Adjustment Instruction

    ADJUSTMENT INSTRUCTION 1. Application Object 3. MICOM Download(Option) These instructions are applied to all of the LCD TV, LA73E. 3-1. Required Test Equipment (1) JIG-LEVER TYPE for adjusting: 1EA (2) PC & MONITOR: 2EA 2. Notes (3) BOARD for INTERFACE: IIC & ISP BOARD: 2EA (1) Because this is not a hot chassis, it is not necessary to use (4) 15P D-SUB CABLE: 2EA an isolation transformer.
  • Page 12 (3) Click the first icon shown in fig.9. The window seen in (3) Click the Send. fig.10 should appear. 3-4. Set Method (1) MCU Select: MTV512M64 (2) Option R/W Option: Auto Write(Verity) (4) When you see (ISP COMPLETE) the download is Jig Option: Myson complete.
  • Page 13 6-3. Adjustment 6. ADC-Set Adjustment (1) Select Component1 as the input with 100% Horizontal 6-1. Synopsis Color Bar Pattern(HozTV31Bar) in 480i Mode (2) After receiving signal for at least 1 second, press the ADJ ADC-Set adjustment to set the black level and the Gain to Key on the Service R/C to enter the ‘Ez - Adjust’...
  • Page 14 7-2. EDID DATA for LA73E 7. EDID(The Extended Display Identification Data)/DDC EDID for HDMI-1 (DDC (Display Data Channel) Data) (Display Data Channel) Download EDID Block 0 table = 0 | 00 FF FF FF FF FF FF 00 1E 6D 01 00 01 01 01 01 This is the function that enables “Plug and Play".
  • Page 15 8. Adjustment of White Balance [ Requirements for Automatic Adjustment 8-1. The Purpose and Principal of Color (1) The illuminance of surroundings 10 lux or less; preventing light in surroundings as much as Temperature Adjustment possible (1) Purpose: to reduce the difference in color temperature (2) The location of the Probe among modules 1) For PDP: place the color analyzer (CA-110, CA-210)
  • Page 16 [ [ RS-232C Command 9. USB S/W Download (Option) (Automatic Adjustment) LA73E Chassis Model All] 9-1. Overview USB Download enables quick response to S/W upgrading RS-232C COMMAND CENTER and helps to configure the panel to the latest updates. [CMD ID DATA] (DEFAULT)(Decimal) (Deci 9-2.

  • Page 17: Troubleshooting & Block Diagram

    TROUBLESHOOTING & BLOCK DIAGRAM - Prouct Brief spec Feature Broadcom Remark 1 RF(Air /Cable) 1 RF Use Brief Info Program Guide Type O(PSIP) USE scalier On/Off OSD Menu XD Engine Enhanced Noise Reduction Yes(2D) Adaptive Picture Mode SRS Trusurround TX Auto Navigation (Link) RGB DTV DOS70,VGA60,S...
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  • Page 43: Exploded View

    EXPLODED VIEW - 43 -...
  • Page 44 "Speaker,Full Range", EN1562C-6712 ND 10W 8OHM 82DB 100HZ 193.5 X 42 X 39.9 LUG KOREA TOPTONE EAJ36548001 "LCD,Module-TFT", "LC370WX3-SLD1 WXGA 37INCH 1366X768 500CD COLOR 72% 16/9 900:1(DCR 5000:1) 6ms(GTG), Zero RT Pol. 10000K LG PHILIPS LCD" ABJ32533605 Cabinet Assembly, "37LC7D-UB LA73E 37"" C/SKD NORTH AMERICA, PACIFIC2(BCM)"...

  • Page 45: Replacement Parts List

    REPLACEMENT PARTS LIST DATE: 2007. 04. 18. LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION ACCESSORY C5001 0CE476WF6DC "Capacitor,AL,Chip" MVK6.3TP16VC47M 47uF 2 C5003 0CE476WF6DC "Capacitor,AL,Chip" MVK6.3TP16VC47M 47uF 2 MFL34797017 "Manual,Owners" PRINTING USER LA73E BR C5020 0CE225WK6DC "Capacitor,AL,Chip"...
  • Page 46 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C7097 0CE106WFKDC "Capacitor,AL,Chip" MVK4.0TP16VC10M 10uF 2 C1062 0CK104BF56A "Capacitor,Ceramic,Chip" C1005X7R104KET 100nF 1 C7098 0CE106WFKDC "Capacitor,AL,Chip" MVK4.0TP16VC10M 10uF 2 C1063 0CK104BF56A "Capacitor,Ceramic,Chip" C1005X7R104KET 100nF 1 C7110 0CE476WF6DC "Capacitor,AL,Chip"...
  • Page 47 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C2600 0CK103BH56A "Capacitor,Ceramic,Chip" C1005X7R1E103KT- 10nF C3061 0CK104BF56A "Capacitor,Ceramic,Chip" C1005X7R104KET 100nF 1 C2601 0CK103BH56A "Capacitor,Ceramic,Chip" C1005X7R1E103KT- 10nF C3062 0CK103BH56A "Capacitor,Ceramic,Chip" C1005X7R1E103KT- 10nF C2602 0CK103BH56A "Capacitor,Ceramic,Chip" C1005X7R1E103KT- 10nF C3063 0CK102BK56A "Capacitor,Ceramic,Chip"...
  • Page 48 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C4094 0CK104BF56A "Capacitor,Ceramic,Chip" C1005X7R104KET 100nF 1 C5050 0CK104BF56A "Capacitor,Ceramic,Chip" C1005X7R104KET 100nF 1 C4095 0CK104BF56A "Capacitor,Ceramic,Chip" C1005X7R104KET 100nF 1 C5051 0CK104BF56A "Capacitor,Ceramic,Chip" C1005X7R104KET 100nF 1 C4096 0CK104BF56A "Capacitor,Ceramic,Chip"...
  • Page 49 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C7043 0CK224CF56A "Capacitor,Ceramic,Chip" 0603B224K160CT 220nF 1 C7161 0CK104BF56A "Capacitor,Ceramic,Chip" C1005X7R104KET 100nF 1 C7047 0CK103BH56A "Capacitor,Ceramic,Chip" C1005X7R1E103KT- 10nF C7301 0CK104BF56A "Capacitor,Ceramic,Chip" C1005X7R104KET 100nF 1 C7049 0CK104BF56A "Capacitor,Ceramic,Chip" C1005X7R104KET 100nF 1 DIODEs C7050 0CK104BF56A...
  • Page 50 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION IC7002 0ISTL00029A "IC,OP Amplifier" MC33078DR2G +-5TO+-18V L4105 6210TCE001X "Filter,Bead" HU-1H4532-121JT 120OHM IC7015 0IPRP00623A "IC,Receiver" "CM2021-00TR 1VTO5.5V,0" L4106 6210TCE001X "Filter,Bead" HU-1H4532-121JT 120OHM IC7016 0IPRP00623A "IC,Receiver" "CM2021-00TR 1VTO5.5V,0" L5001 6210TCE001G "Filter,Bead"...
  • Page 51 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION TRANSISTORs & FETs AR2009 0RJ0222C692 "Resistor,Chip" MNR04 M0APJ 220 22OHM AR2011 0RJ0222C692 "Resistor,Chip" MNR04 M0APJ 220 22OHM Q6002 EBK32753101 FET SI4925BDY P-CHANNEL MO AR2012 0RJ0222C692 "Resistor,Chip" MNR04 M0APJ 220 22OHM Q7200 0TR830009BA FET BSS83 N-CHANNEL MOSFET...
  • Page 52 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R1058 0RJ0000C678 "Resistor,Chip" MCR01MZPJ000 0OHM 5% 1 R2512 0RJ0682C678 "Resistor,Chip" MCR01MZPJ680 68OHM 5% R1059 0RJ0222C678 "Resistor,Chip" MCR01MZPJ220 22OHM 5% R2600 0RJ0682C678 "Resistor,Chip" MCR01MZPJ680 68OHM 5% R106 0RH0000D622 "Resistor,Chip"...
  • Page 53 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R3109 0RJ1001C678 "Resistor,Chip" MCR01MZPJ102 1KOHM 5% R4066 0RJ4701C678 "Resistor,Chip" MCR01MZPJ472 4.7KOHM 5 R3111 0RJ2701C678 "Resistor,Chip" MCR01MZPJ272 2.7KOHM 5 R4067 0RJ4702D677 "Resistor,Chip" MCR03EZPJ473 47KOHM 5% R3112 0RJ1001C678 "Resistor,Chip"...
  • Page 54 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R4137 0RJ6802D677 "Resistor,Chip" MCR03EZPJ683 68KOHM 5% R5040 0RJ1001C678 "Resistor,Chip" MCR01MZPJ102 1KOHM 5% R4140 0RJ1000C678 "Resistor,Chip" MCR01MZPJ101 100OHM 5% R5042 0RJ7500D677 "Resistor,Chip" MCR03EZPJ751 750OHM 5% R4142 0RJ1000D677 "Resistor,Chip"...
  • Page 55 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R5103 0RJ0822C678 "Resistor,Chip" MCR01MZPJ820 82OHM 5% R7011 0RJ0222C678 "Resistor,Chip" MCR01MZPJ220 22OHM 5% R5105 0RJ2201D677 "Resistor,Chip" MCR03EZPJ222 2.2KOHM 5 R7012 0RJ0222C678 "Resistor,Chip" MCR01MZPJ220 22OHM 5% R5106 0RJ0822C678 "Resistor,Chip"...
  • Page 56 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R71000 0RJ5602D677 "Resistor,Chip" MCR03EZPJ563 56KOHM 5% R7213 0RJ1000D677 "Resistor,Chip" MCR03EZPJ101 100OHM 5% R71001 0RJ0000C678 "Resistor,Chip" MCR01MZPJ000 0OHM 5% 1 R7214 0RJ1000D677 "Resistor,Chip" MCR03EZPJ101 100OHM 5% R71003 0RJ5602D677 "Resistor,Chip"...
  • Page 57 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION SW102 140-313B "Switch,Tact" KPT-1115AM 1C1P 12VDC SW103 140-313B "Switch,Tact" KPT-1115AM 1C1P 12VDC SW104 140-313B "Switch,Tact" KPT-1115AM 1C1P 12VDC SW105 140-313B "Switch,Tact" KPT-1115AM 1C1P 12VDC SW106 140-313B "Switch,Tact"...
  • Page 60 Feb., 2007 P/NO : MFL36768801 Printed in Korea...

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