LG 26LC7D Service Manual
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LG 26LC7D Service Manual

LG 26LC7D Service Manual

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LCD TV

SERVICE MANUAL

CHASSIS : LB73A
MODEL : 26LC7D
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
26LC7D-AB
R
website:http://biz.LGservice.com

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Summary of Contents for LG 26LC7D

  • Page 1: Service Manual

    LCD TV SERVICE MANUAL CHASSIS : LB73A MODEL : 26LC7D 26LC7D-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...................18 EXPLODED VIEW .................. 20 REPLACEMENT PARTS LIST ............... 22 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 550 : 1 700 : 1 HDMI input(255level) 450 : 1 600 : 1 RF/AV/COMP/RGB input Brightness uniformity 1.25 Refer to LCD spec. Color coordinate ±...
  • 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 26" 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 MEMO - 19 -...

  • Page 13: 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 14 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 15 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 16 (5) When Component or RGB-DTV/ PC mode is abnormal Is the CXA2151Q(IC500) Is normal the Input voltage, IIC Replace the IC. normal? Communication and HV sync? Is the MST3362(IC604) Is normal the Input voltage, IIC Replace the IC. normal? Communication and HV sync? Is normal the Input voltage, IIC Is the Scaler normal? Replace the IC.
  • Page 17 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 18: Block Diagram

    BLOCK DIAGRAM HD2_ICE958_OUT SPDI HD2_DAC_SCLK HD2_DAC_LRCLK SPDIF HD2_ICE958_IN - 18 -...
  • Page 19 MEMO - 12 -...

  • Page 20: Exploded View

    EXPLODED VIEW - 20 -...

  • Page 21: Exploded View Parts List

    Bracket Assembly 26LC7D LA73E SPEAKER GRIIL HI-GLOSSSY & WITH SHEET ACQ32380005 Cover Assembly,Rear 26LC7D-AB LB73A 26” FOR AU MCK36577102 Cover MOLD HIPS 26LC7D-AB HIPS 51SF REAR A/V EVER3 FOR AU MCK34645301 Cover,Rear MOLD HIPS 51SF 26LC3R/27LC7R ABS stand rear cover HIPS 51SF MGJ32425801 Plate PRESS EGI T1.6 METAL HGI -...

  • Page 22: Replacement Parts List

    REPLACEMENT PARTS LIST DATE: 2007. 04. 02. LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION CAPACITORs C1109 0CC560BK41A C1005C0G1H560JT 56pF 5% 50V C0G -55TO+125C C111 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R -55TO+125 0CH5101K416 C2012C0G1H101JT 100pF 5% 50V C0G -55TO+125 C1110 0CC560BK41A C1005C0G1H560JT 56pF 5% 50V C0G -55TO+125C...
  • Page 23 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C1308 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R -55TO+125 C1209 0CZZB00035A GRM1555C1H330J 33pF 5% 50V C0G -55TO+125C C121 0CE476WF6DC MVK6.3TP16VC47M 47uF 20% 16V 80MA -40TO+10 C1309 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R -55TO+125 C1210 0CZZB00035A...
  • Page 24 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C327 0CK334CF56A C1608X7R1C334KT 330nF 10% 16V X7R -55TO+12 C1521 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R -55TO+125 C1522 0CK103BH56A C1005X7R1E103KT- 10nF 10% 25V X7R -55TO+12 C328 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R -55TO+125 C1523 0CK103BH56A...
  • Page 25 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C491 0CE476WH6DC MVK8.0TP25VC47M 47uF 20% 25V 80MA -40TO+85 C437 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R -55TO+125 C438 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R -55TO+125 C491 EAE30840401 25SVPD10M 10uF 20% 25V 1.5A -55TO+125C SVP C439 0CK104BF56A...
  • Page 26 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C658 0CK105CF94A 0603F105Z160CT 1uF -20TO+80% 16V Y5V -30TO C526 EAE33970001 CS1005X5R105K6R3NR 1uF 10% 6.3V X5R -55TO+ C527 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R -55TO+125 C659 0CE105WK6DC MVK4.0TP50VC1M 1uF 20% 50V 5.6MA -40TO+105 C527 EAE33970001...
  • Page 27 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C830 0CK103BH56A C1005X7R1E103KT- 10nF 10% 25V X7R -55TO+12 C742 EAE32166101 CS1005XR473K250CR 0.047uF 10% 25V X7R -55T C743 0CK102BK56A 0402B102K500CT 1nF 10% 50V X7R -55TO+125C C831 0CK102BK56A 0402B102K500CT 1nF 10% 50V X7R -55TO+125C C744 EAE32166101...
  • Page 28 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION DIODEs C943 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R -55TO+125 C944 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R -55TO+125 D1400 0DD184009AA KDS184 KDS184 TP KEC - 85V - - - 300MA KEC C945 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R -55TO+125...
  • Page 29 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION IC801 0IPMG00049A AZ1117H-1.8TR/E1[H13A] 3.2TO10V 1.8V 0W SO ZD630 0DZ560009DA UDZS5.6B 5.6V 5.49TO5.73V 60OHM 200MW SOD3 0DZ560009DA UDZS5.6B 5.6V 5.49TO5.73V 60OHM 200MW SOD3 IC801 0IPMG00049A AZ1117H-1.8TR/E1[H13A] 3.2TO10V 1.8V 0W SO IC802 0IPMGA0010A AZ1117H-3.3 4.75TO10V 3.3V 0W SOT223 R/TP...
  • Page 30 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION AR703 0RJ0222C692 MNR04 M0APJ 220 22OHM 5% 1/16W 1005X4 R/TP Q806 0TR387500AA 2SC3875S(ALY) NPN 5V 60V 50V 150MA 100NA 7 Q807 0TR150400BA 2SA1504S(ASY) PNP -5V -50V -50V -0.15A -0. AR703 EBC32260405 MNR04M0APJ680 68OHM 5% 1/16W 4 SMD R/TP 8P...
  • Page 31 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R1151 0RJ2201C678 MCR01MZPJ222 2.2KOHM 5% 1/16W 1005 R/TP R R105 0RJ0000C678 MCR01MZPJ000 0OHM 5% 1/16W 1005 R/TP ROHM R1050 0RJ1001C678 MCR01MZPJ102 1KOHM 5% 1/16W 1005 R/TP ROH R1152 0RJ2201C678 MCR01MZPJ222 2.2KOHM 5% 1/16W 1005 R/TP R...
  • Page 32 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R1427 0RJ0222C678 MCR01MZPJ220 22OHM 5% 1/16W 1005 R/TP - R R1307 0RJ0222C678 MCR01MZPJ220 22OHM 5% 1/16W 1005 R/TP - R R1308 0RJ0222C678 MCR01MZPJ220 22OHM 5% 1/16W 1005 R/TP - R R1428 0RJ0222C678 MCR01MZPJ220 22OHM 5% 1/16W 1005 R/TP - R...
  • Page 33 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R2614 0RJ0000C678 MCR01MZPJ000 0OHM 5% 1/16W 1005 R/TP ROHM R1516 0RJ2701C678 MCR01MZPJ272 2.7KOHM 5% 1/16W 1005 R/TP - R1516 0RJ4701C678 MCR01MZPJ472 4.7KOHM 5% 1/16W 1005 R/TP R R2616 0RJ0000C678 MCR01MZPJ000 0OHM 5% 1/16W 1005 R/TP ROHM...
  • Page 34 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R3087 0RJ0222C678 MCR01MZPJ220 22OHM 5% 1/16W 1005 R/TP - R 0RH0000D622 MCR10EZHJ000 0OHM 5% 1/8W 2012 R/TP ROHM R3002 0RJ0000C678 MCR01MZPJ000 0OHM 5% 1/16W 1005 R/TP ROHM R3088 0RJ0222C678 MCR01MZPJ220 22OHM 5% 1/16W 1005 R/TP - R...
  • Page 35 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R519 0RJ0272C678 MCR01MZPJ270 27OHM 5% 1/16W 1005 R/TP ROH R407 0RJ0000C678 MCR01MZPJ000 0OHM 5% 1/16W 1005 R/TP ROHM R409 0RJ1002C678 MCR01MZPJ103 10KOHM 5% 1/16W 1005 R/TP RO R522 0RJ2202C678 MCR01MZPJ223 22KOHM 5% 1/16W 1005 R/TP -...
  • Page 36 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R725 0RJ0222C678 MCR01MZPJ220 22OHM 5% 1/16W 1005 R/TP - R R650 0RJ0752C678 MCR01MZPJ750 75OHM 5% 1/16W 1005 R/TP ROH R651 0RJ0822C678 MCR01MZPJ820 82OHM 5% 1/16W 1005 R/TP ROH R726 0RJ0222C678 MCR01MZPJ220 22OHM 5% 1/16W 1005 R/TP - R...
  • Page 37 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R929 0RJ0472C678 MCR01MZPJ470 47OHM 5% 1/16W 1005 R/TP - R R790 0RJ0000C678 MCR01MZPJ000 0OHM 5% 1/16W 1005 R/TP ROHM R791 0RJ0000C678 MCR01MZPJ000 0OHM 5% 1/16W 1005 R/TP ROHM R934 0RJ3901C678 MCR01MZPJ392 3.9KOHM 5% 1/16W 1005 R/TP -...
  • Page 38 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION L402 0LCML00003B Filter,Bead MLB-201209-0120P-N2 120OHM FL609 EAM37276902 Filter,LCR LCF20P101-TM LPF(EMI) 100MHZ 30pF 0LC1032101A Inductor,Multilayer,Chip FI-C3216-103KJT 10UH L403 0LCML00003B Filter,Bead MLB-201209-0120P-N2 120OHM 6210TCE001A Filter,Bead HB-1S2012-080JT 8OHM 2X1.25X1MM L404 0LCML00003B Filter,Bead MLB-201209-0120P-N2 120OHM...
  • Page 39 EAD30302101 10P SHIELD DMS CONNECTOR ASSY SMH200-10P S MFL37734801 Manual,Owners PRINTING USER LB73A BRAND EAD35683002 LVDS LPL STANDARD FI-X30HL(JAE) FI-X30HL(J MKJ32022831 Remote Controller COMPLEX LB73A 26LC7D-AB 6410TSW003A Power Cord LP-23A+SAG18N<B10A&LS-13_1.87M SWITCHes SAC30653103 Title LB73A_26LC7D-AB EN(1) 49519K0002A Plate Assembly SUPPORTER UPPER 26INCH 140-313A THVV501BBC 1C1P 12VDC 0.05A HORIZONTAL 100...
  • Page 40 HD2_MEM_DATA[0-63] 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 1.8V Regulator for HD2.4 Digital Power 1 TUNER HD2_MEM_BA1 HD2_MEM_BA1 HD2_MEM_BA0 HD2_MEM_BA0 HD2_MEM_CS HD2_MEM_CS 1.8V Regulator for HD2.4 Analog Power 1.8V Regulator for HD2.4 Analog Power HD2_MEM_WE HD2_MEM_WE +3.3V +3.3V HD2_MEM_RAS...
  • Page 41 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 42 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 43 Apr., 2007 P/NO : MFL37744301 Printed in Korea...

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