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LG 37LB4DS Service Manual
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LG 37LB4DS Service Manual

LG 37LB4DS Service Manual

Chassis la73a
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LCD TV
SERVICE MANUAL
CHASSIS : LA73A
MODEL : 37LB4DS
42LB4DS
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
37LB4DS-UA
42LB4DS-UA
R

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Summary of Contents for LG 37LB4DS

  • Page 1 LCD TV SERVICE MANUAL CHASSIS : LA73A MODEL : 37LB4DS 37LB4DS-UA 42LB4DS 42LB4DS-UA 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 ...............13 TROUBLE SHOOTING & BLOCK DIAGRAM ........18 EXPLODED VIEW .................. 44 REPLACEMENT PARTS LIST ............... 48 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 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

    4) CATV : 01~135 5) CADTV : 01~135 Input Voltage 1) AC 100 ~ 240V 50/60Hz Market NORTH AMERICA Screen Size 37 inch Wide(1366 x 768) 37LB4DS 42 inch Wide(1366 x 768) 42LB4DS Aspect Ratio 16:9 Tuning System LCD Module LC370WX2-SLD1...
  • Page 7 5. Chrominance & Luminance Specification Item Unit Remark White peak brightness cd/m 37LB4DS cd/m 42LB4DS Contrast ratio cd/m Brightness uniformity Full white Color coordinate 0.638 +/- 0.03 0.340 +/- 0.03 GREEN 0.279 +/- 0.03 0.611 +/- 0.03 BLUE 0.146 +/- 0.03 0.062...
  • Page 8 Peak & average Brightness & Contrast measure standard specification - White Peak brightness measure specification 1) In non-impressed condition, measure peak brightness displayable as much as possible LCD module. 2) Measuring instrument: CA-110 or a sort of Color Analyzer. 3) Pattern Generator : VG-828 or a sort of digital pattern generator (displayable Full White & 1/25 White Window pattern) 4) Measure condition - Test pattern: in center, 1/5(H)x1/5(V) of Window Pattern (white pattern in non-impressed condition) - SET condition : Contrast &...
  • Page 9 6. Component Video Input (Y, P Specification Remark Resolution H-freq(kHz) V-freq(Hz) 720*480 15.73 SDTV ,DVD 480I 720*480 15.73 59.94 SDTV ,DVD 480I 720*480 31.47 SDTV 480P 720*480 31.47 59.94 SDTV 480P 1280*720 45.00 60.00 HDTV 720P 1280*720 44.96 59.94 HDTV 720P 1920*1080 33.75 60.00...
  • Page 10 8. HDMI Input (PC/DTV) Resolution H-freq(kHz) V-freq(Hz) Pixel clock(MHz) Remark 640*350 31.468 70.09 25.17 720*400 31.469 70.08 28.32 640*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)
  • Page 11 Remark Product Widt(W) Length(D) Height(H) Dimension Before Packing 1032.7 287.6 After Packing 1119 Product Only SET 27.1 With BOX 32.5 10-2. 37LB4DS Item Content Unit Remark Product Widt(W) Length(D) Height(H) Dimension Before Packing 926.6 284.4 697.6 With Stant 926.6 88.0 635.6...
  • Page 12 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 13: Adjustment Instruction

    ADJUSTMENT INSTRUCTION 1. Scope 4. Adjustment method using RS-232C These instructions are applied to all of the LCD TV, LA73A Adjust the 3 board adjustment items of 3 using the RS-232C Chassis. according to the "4.1.2 Adjustment order". 4-1. Necessary details before adjustment 2.
  • Page 14 Rev button O Check RS-232C operation In this case, first press the of Video Signal Press the Instart of adjustment R/C to enter the 7.Baud Rate Generator (Master), to generate the white pattern to be displayed menu and set the Baud Rate to 115200 to check the 232-C from the left.
  • Page 15 5.3 480i Comp1, 1080p Comp1/RGB adjustment 6. EDID(The Extended Display method Identification Data)/DDC (Display Data Channel) Download A. ADC 480i component1 adjustment - Check Component1 connected condition from the using device. 6.1 Introduction - (MSPG-925FA : (model :209 , pattern :65 ) This has been established by VESA and is the function B.
  • Page 16 6.3 EDID Data for LA73A - 16 -...
  • Page 17 7. White Balance adjustment A. Connect the set according to the internal pattern or HDMI input in accordance with 4.3.2 measuring device connection diagram. B. Set the Baud Rate of RS-232C to 115200. It is set to 115200 7-1. Using device as default.

  • Page 18: Troubleshooting & Block Diagram

    TROUBLESHOOTING & BLOCK DIAGRAM - 18 -...
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  • Page 44: Exploded View

    EXPLODED VIEW - 42LB4DS - 44 -...
  • Page 45 Speaker,Tweeter, EN10D-6714 ND 10W 8OHM 82DB 0HZ 68 X 23 X 22.7 LUG KOREA TOPTONE EAJ37992501 LCD,Module-TFT, LC420WX4-SLA2 WXGA 42.0INCH 1366X768 500CD COLOR 72% 16/9 1000:1(basic) 120Hz A-TW 10000K EMI Improvement(for SLA1) LG PHILIPS LCD ABJ31687106 Cabinet Assembly, 42LB4DS-UA LA73A 42" CABINET ASSY CSKD ACQ31687011 Cover Assembly,Rear, 42LB4DS-UA LA73A 42"...
  • Page 46 EXPLODED VIEW - 37LB4DS - 46-...
  • Page 47 Speaker,Full Range, EN1562C-6712 ND 10W 8OHM 82DB 100HZ 193.5 X 42 X 39.9 LUG KOREA TOPTONE EAJ32126001 LCD,Module-TFT, LC370WX2-SLD1 WXGA 37.0INCH 1366X768 500CD COLOR 72% 16/9 1000:1(basic) 120Hz,0RT Pol. LG PHILIPS LCD ABJ31872405 Cabinet Assembly, 37LB4DS-UA LP78A 37" 37LB4DS-UA CABINET ASSY(C/SKD) ACQ31873408 Cover Assembly,Rear, 37LB4DS-UA LA73A 37"...

  • Page 48: Replacement Parts List

    REPLACEMENT PARTS LIST DATE: 2007. 03. 29. LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION ACCESSORY C466 0CE476WF6DC "Capacitor,AL,Chip" MVK6.3TP16VC47M 47uF 20 C487 0CE106WFKDC "Capacitor,AL,Chip" MVK4.0TP16VC10M 10uF 20 MFL35930210 "Manual,Owners" PRINTING USER LA73A BRA C488 0CE106WFKDC "Capacitor,AL,Chip"...
  • Page 49 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C701 EAE30840301 "Capacitor,AL,Chip" 10SVPC68M 68uF 20% 10V C2119 0CK104BF56A "Capacitor,Ceramic,Chip" C1005X7R104KET 100nF 10 C7014 0CE107WF6DC "Capacitor,AL,Chip" MVK6.3TP16VC100M 100uF C212 0CK104BF56A "Capacitor,Ceramic,Chip" C1005X7R104KET 100nF 10 C711 0CE225WK6DC "Capacitor,AL,Chip"...
  • Page 50 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C2177 EAE33970001 "Capacitor,Ceramic,Chip" CS1005X5R105K6R3NR 1uF C223 0CK104BF56A "Capacitor,Ceramic,Chip" C1005X7R104KET 100nF 10 C2178 EAE33970001 "Capacitor,Ceramic,Chip" CS1005X5R105K6R3NR 1uF C2230 0CK104BF56A "Capacitor,Ceramic,Chip" C1005X7R104KET 100nF 10 C2179 EAE33970001 "Capacitor,Ceramic,Chip" CS1005X5R105K6R3NR 1uF C2231 0CK104BF56A "Capacitor,Ceramic,Chip"...
  • Page 51 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C328 0CK106DC67A "Capacitor,Ceramic,Chip" JMK212JB106MG-T 10uF 20 C405 0CK104BF56A "Capacitor,Ceramic,Chip" C1005X7R104KET 100nF 10 C329 0CK105EJ56A "Capacitor,Ceramic,Chip" GMK316BJ105KL-T 1uF 10% C406 0CK104BF56A "Capacitor,Ceramic,Chip" C1005X7R104KET 100nF 10 C330 0CK104BF56A "Capacitor,Ceramic,Chip"...
  • Page 52 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C482 0CK104BF56A "Capacitor,Ceramic,Chip" C1005X7R104KET 100nF 10 C528 0CK103CK56A "Capacitor,Ceramic,Chip" 0603B103K500CT 10nF 10% C484 0CK104BF56A "Capacitor,Ceramic,Chip" C1005X7R104KET 100nF 10 C529 0CK104BF56A "Capacitor,Ceramic,Chip" C1005X7R104KET 100nF 10 C491 0CK104BF56A "Capacitor,Ceramic,Chip"...
  • Page 53 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C6017 0CK226FF67A "Capacitor,Ceramic,Chip" EMK325BJ226MM-T 22uF 20 C677 0CK104BF56A "Capacitor,Ceramic,Chip" C1005X7R104KET 100nF 10 C6018 0CK102BK56A "Capacitor,Ceramic,Chip" 0402B102K500CT 1nF 10% C678 0CK104BF56A "Capacitor,Ceramic,Chip" C1005X7R104KET 100nF 10 C6019 0CK102BK56A "Capacitor,Ceramic,Chip"...
  • Page 54 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C803 0CK104BF56A "Capacitor,Ceramic,Chip" C1005X7R104KET 100nF 10 D302 0DRSE00038A "Diode,TVS" SDC15 1.3V 14.3VTO16.4V C804 0CK104BF56A "Capacitor,Ceramic,Chip" C1005X7R104KET 100nF 10 ZD101 0DZ560009DA "Diode,Zener" UDZS5.6B 5.6V 5.49TO5.7 C805 0CK104BF56A "Capacitor,Ceramic,Chip"...
  • Page 55 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION IC603 0IPMGA0010A "IC,LDO Voltage Regulator" AZ1117H-3.3 4.75TO10V 3 L406 6200J00005N "Filter,Bead" HH-1M2012-121JT(H:1mm) IC605 0IPMG00049A "IC,LDO Voltage Regulator" AZ1117H-1.8TR/E1[H13A] L407 6200J00005N "Filter,Bead" HH-1M2012-121JT(H:1mm) IC704 0IPMGKE030A "IC,LDO Voltage Regulator" KIA78R05F 6TO12V 5V 8W L408 6200J00005N "Filter,Bead"...
  • Page 56 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION L747 EAM37574201 "Filter,LCR" LC-2012-250JT LPF(EMI) Q402 0TR104009AF "TR,Bipolar" KRC104S NPN 40V 0V 50V L751 EAM37276902 "Filter,LCR" LCF20P101-TM LPF(EMI) 1 Q403 0TR387500AA "TR,Bipolar" 2SC3875S(ALY) NPN 5V 60 L752 EAM37276902 "Filter,LCR"...
  • Page 57 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION AR806 0RJ0222C687 "Resistor,Array" RCA86TRJ22R0 22OHM 5% 1 R109 0RJ0000D677 "Resistor,Chip" MCR03EZPJ000 0OHM 5% 1/ AR807 0RJ0222C687 "Resistor,Array" RCA86TRJ22R0 22OHM 5% 1 R110 0RH0000D622 "Resistor,Chip" MCR10EZHJ000 0OHM 5% 1/ AR808 0RJ0512C687 "Resistor,Array"...
  • Page 58 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R181 0RJ0332C678 "Resistor,Chip" MCR01MZPJ330 33OHM 5% 1 R3028 0RJ1000C678 "Resistor,Chip" MCR01MZPJ101 100OHM 5% R182 0RJ0332C678 "Resistor,Chip" MCR01MZPJ330 33OHM 5% 1 R303 0RJ3300C678 "Resistor,Chip" MCR01MZPJ331 330OHM 5% R190 0RJ1002C678 "Resistor,Chip"...
  • Page 59 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R354 0RJ4701C678 "Resistor,Chip" MCR01MZPJ472 4.7KOHM 5% R4020 0RJ5101C678 "Resistor,Chip" MCR01MZPJ512 5.1KOHM 5% R355 0RJ4701C678 "Resistor,Chip" MCR01MZPJ472 4.7KOHM 5% R4021 0RJ1002C678 "Resistor,Chip" MCR01MZPJ103 10KOHM 5% R356 0RJ4702C678 "Resistor,Chip"...
  • Page 60 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R4068 0RJ0752C678 "Resistor,Chip" MCR01MZPJ750 75OHM 5% 1 R4145 0RJ2000C678 "Resistor,Chip" MCR01MZPJ201 200OHM 5% R4069 0RJ0752C678 "Resistor,Chip" MCR01MZPJ750 75OHM 5% 1 R4146 0RJ1000C678 "Resistor,Chip" MCR01MZPJ101 100OHM 5% R4070 0RJ0752C678 "Resistor,Chip"...
  • Page 61 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R460 0RJ1002C678 "Resistor,Chip" MCR01MZPJ103 10KOHM 5% R5043 0RJ2200D677 "Resistor,Chip" MCR03EZPJ221 220OHM 5% R464 0RJ4701C678 "Resistor,Chip" MCR01MZPJ472 4.7KOHM 5% R5045 0RJ1001D677 "Resistor,Chip" MCR03EZPJ102 1KOHM 5% 1 R465 0RJ4701C678 "Resistor,Chip"...
  • Page 62 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R590 0RJ0222C678 "Resistor,Chip" MCR01MZPJ220 22OHM 5% 1 R664 0RJ0000C678 "Resistor,Chip" MCR01MZPJ000 0OHM 5% 1/ R591 0RJ0222C678 "Resistor,Chip" MCR01MZPJ220 22OHM 5% 1 R666 0RJ0000C678 "Resistor,Chip" MCR01MZPJ000 0OHM 5% 1/ R593 0RJ4702C678 "Resistor,Chip"...
  • Page 63 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R723 0RJ0000C678 "Resistor,Chip" MCR01MZPJ000 0OHM 5% 1/ R8028 0RJ0512C678 "Resistor,Chip" MCR01MZPJ510 51OHM 5% 1 R723 0RJ1000C678 "Resistor,Chip" MCR01MZPJ101 100OHM 5% R8029 0RJ1002C678 "Resistor,Chip" MCR01MZPJ103 10KOHM 5% R724 0RJ0000C678 "Resistor,Chip"...
  • Page 64 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION VR401 6102W5V016A Varistor AVRL161A1R1NT 10V 30% 1 P105 6602T20008D "Connector,Wafer" SMW200-05P 5P 2.00MM 1R VR402 6102W5V016A Varistor AVRL161A1R1NT 10V 30% 1 P501 6602T25008C "Connector,Wafer" SMW250-04P 4P 2.50MM 1R VR403 6102W5V016A Varistor AVRL161A1R1NT 10V 30% 1...
  • Page 67 Mar., 2007 P/NO : MFL35929303 Printed in Korea...

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