LG 42LC2D Service Manual
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LG 42LC2D Service Manual

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LCD TV

SERVICE MANUAL

CHASSIS : LA51D
FACTORY NAME : 42LC2D-UD
MODEL : 42LC2D
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
e-mail:http://www.LGEservice.com/techsup.html
R
website:http://biz.LGservice.com

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Summary of Contents for LG 42LC2D

  • Page 1: Service Manual

    LCD TV SERVICE MANUAL CHASSIS : LA51D FACTORY NAME : 42LC2D-UD MODEL : 42LC2D 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 ...............10 TROUBLE SHOOTING ................15 BLOCK DIAGRAM...................22 WIRING DIAGRAM ..................23 EXPLODED VIEW .................. 24 REPLACEMENT PARTS LIST ............... 28 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 4) CATV : 01~135 5) CADTV : 01~135 Input Voltage 1) AC 100 ~ 240V 50/60Hz Market NORTH AMERICA Screen Size 42 inch Wide For 42LC2D Aspect Ratio 16:9 Tuning System LCD Module LC420W02-B6K1 For 42LC2D Operating Environment 1) Temp : 0 ~ 40 deg...

  • Page 7: Contents

    5. Chroma & Brightness CONDITION : EZ-Picture "Normal" Item Unit Remark White peak brightness cd/m HDMI input, full white Contrast Ratio 400:1 550:1 Brightness uniformity Refer to LCD SPEC. Color coordinate 0.640 +/- 0.03 0.341 +/- 0.03 GREEN 0.287 +/- 0.03 0.610 +/- 0.03 BLUE...
  • Page 8 8. RGB Iinput (PC/DTV) Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed 720x400 31.469 70.08 28.32 640x480 31.469 59.94 25.17 VESA(VGA) 640x480 37.861 72.80 31.50 VESA(VGA) 640x480 37.500 75.00 31.50 VESA(VGA) 800x600 35.156 56.25 36.00 VESA(SVGA) 800x600 37.879 60.31 40.00 VESA(SVGA) 800x600 48.077 72.18 50.00...

  • Page 9: Adjustment Instruction

    ADJUSTMENT INSTRUCTION 1. Application Object 4. EDID(The Extended Display These instructions are applied to all of the LCD TV, LA51D. Identification Data)/DDC (Display Data Channel) download 2. Notes This is the function that enables “Plug and Play". (1) Because this is not a hot chassis, it is not necessary to use 4-1.
  • Page 10 EDID DATA for RGB 5-3. Adjustment EDID table = (1) Select Component1 or Component2 as the input with 100% Horizontal Color Bar Pattern(HozTV31Bar) in 720p 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F Mode and select ‘Normal’...
  • Page 11 6-2. Adjustment of White Balance 7. Video(uPD) Operate the Zero-calibration of the CA-210, then attach 7-1. Required Equipment sensor to module surface when you adjust. Manual adjustment is also possible by the following sequence. MSPG925FA Pattern Generator-connector with Video Input 7-2.
  • Page 12 8. Shipping Conditions 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 Audio Audio Language EZ SoundRite EZ Sound Normal Balance Treble Bass Front Surround TV Speaker Timer Auto clock Manual Clock...

  • Page 13: Svc Remocon

    SVC REMOCON To turn the TV on or off POWER To turn the TV on automatically if the power is supplied to the TV. (Use the POWER ON POWER key to deactivate): It should be deactivated when delivered. To activate the mute function. MUTE To check TV screen image easily.

  • Page 14: Troubleshooting

    TROUBLESHOOTING 1. Power Board 1-1. General Power Flow Start check Doesn't the It is identical Is the Interface screen whole come with Power Off signal operated? out? condition? 1. Check the Power Off 2. Check the Interface condition. signal condition. Doesn't the Doesn't the Doesn't the...
  • Page 15 2. No Power (1) Symptom Does’t minute discharge at module. Ø No front LED. Ø (2) Check follow Power cord connected? Plug in power cord. Cable connecting the Line Filter Connect Cable. and Power Board connected? Is Fuse(F101) on Power Board Replace Fuse.

  • Page 16: Abnormal Display

    3. Abnormal Display 3-1. Does’t display the OSD (1) Symptom LED is green Ø The minute discharge continuously becomes Ø accomplished from module (2) Check follow Check the LVDS Is the LVDS cable Replace cable. cable? connected well? Reset cable. Replace Is the VSC Digital Operates the Thine...
  • Page 17 3-2. In case of does’t display the screen into specific mode (1) Symptom The screen does not become the display from specific input mode Ø (RF, AV, Component, RGB, DVI). (2) Check follow Check the all input mode should become normality display. Ø...
  • Page 18 (5) Abnormal display in Component 480i mode Is the Video Decoder Are the Input voltage, IIC Replace IC IC306 UPD64011 Comm. and HV sync good? good? Is IC400 Are the Input voltage, IIC Replace IC Scaler good? Comm. and HV sync good? (6) Abnormal display in Component DTV mode Are the Input voltage, IIC Is normal the IC104...
  • Page 19 (7) Abnormal display in RGB DTV mode Are the Input voltage, IIC Is normal the IC101 Replace IC101 Comm. and HV sync good? CXA2181Q? Is normal the IC306 Are the Input voltage, IIC Replace IC306 MST9883C? Comm. and HV sync good? Is normal IC400 the Are the Input voltage, IIC Replace IC400...

  • Page 20: No Sound

    4. No sound (1) Symptom LED is green Ø Screen display but no audio Ø (2) Check follow Check Speaker Is the SPK cable Replace SPK cable cable? connected well? Reset cable. Audio normal on Is the Flat cable IC1004 MSP4440K IC1002 NSP-2100A RGB/DVI? connected well?

  • Page 21: Block Diagram

    BLOCK DIAGRAM - 21 -...
  • Page 22 - 22 -...
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  • Page 24: Exploded View Parts List

    SPEAKER,WOOFER, G1560102 MACOM WOOFER 8OHM 15/20W 82DB OTHERS 100HZ 193*57MM 6400DTTX02A SPEAKER,TWEETER, EN15D-6629 TOPTONE TWEETER(DOME) 8OHM 15/20W 78DB OTHERS LC2 MODEL 68719ST914A PWB(PCB) ASSEMBLY, SUB, SUB T.T LA51D 42LC2D-UD ALUSLLX IR TOTAL ASSY 4980V00390A SUPPORTER, NUT(3200KN0001A) BS SK-011T 6709900017A POWER SUPPLY ASSEMBLY, 42INCH H3/E2 LCD MODEL LCD YY LB LC 42INCH 68719ST920A PWB(PCB) ASSEMBLY,SUB, SUB T.T LA51D 42LC2D-UD ALUSLLX AV TOTAL...

  • Page 25: Replacement Parts List

    REPLACEMENT PARTS LIST For Capacitor & Resistors, the CC, CX, CK, CN, CH : Ceramic RD : Carbon Film charactors at 2nd and 3rd digit in the CQ : Polyestor RS : Metal Oxide Film P/No. means as follows; CE : Electrolytic RN : Metal Film CF : Fixed Film RH : CHIP, Metal Glazed(Chip)
  • Page 26 DATE: 2006. 02. 06. DATE: 2006. 02. 06. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C334 0CK104CK56A 0.1UF 1608 50V 10% R/TP X7R C451 0CK104CK56A 0.1UF 1608 50V 10% R/TP X7R C335 0CK104CK56A 0.1UF 1608 50V 10% R/TP X7R...
  • Page 27 DATE: 2006. 02. 06. DATE: 2006. 02. 06. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C811 0CK104CK56A 0.1UF 1608 50V 10% R/TP X7R C1117 0CK103CK56A 0.01UF 1608 50V 10% R/TP X7 C812 0CK104CK56A 0.1UF 1608 50V 10% R/TP X7R...
  • Page 28 DATE: 2006. 02. 06. DATE: 2006. 02. 06. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C605 0CK104CK56A 0.1UF 1608 50V 10% R/TP X7R C618 0CC102CK41A 1000PF 1608 50V 5% R/TP NP0 C628 0CK104CK56A 0.1UF 1608 50V 10% R/TP X7R...
  • Page 29 IC400 0ICTMLG009C LGDT1102C HD2.3 LG IC SBGA- C629 0CH8226F691 22UF 16V 20% 105STD (CYL) R IC505 0ICTMLG013A LGDT1901A LG IC 24P SSOP TR C630 0CH8226F691 22UF 16V 20% 105STD (CYL) R IC902 0ICTMLG018B LGDP4411 IEP2 LG IC 208P LQ C646...
  • Page 30 DATE: 2006. 02. 06. DATE: 2006. 02. 06. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION IC306 0IPRPM3002D "MST9883C-LF-110 MSTAR 80P,L" L1001 0LCML00003B MLB-201209-0120P-N2 5A MAG IC507 0IPRP00668A "IDT2309A-1DCG IDT 16P,SOIC" L1002 0LCML00003B MLB-201209-0120P-N2 5A MAG...
  • Page 31 DATE: 2006. 02. 06. DATE: 2006. 02. 06. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION Q300 0TR102009AJ KRC102S KEC REEL TAPING SOT R1060 0RJ0101D677 1 OHM 1/10 W 5% 1608 R/TP Q301 0TR102009AJ KRC102S KEC REEL TAPING SOT...
  • Page 32 DATE: 2006. 02. 06. DATE: 2006. 02. 06. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R308 0RJ2202D677 22K OHM 1/10 W 5% 1608 R/TP R965 0RJ4701D677 4.7K OHM 1/10 W 5% 1608 R/T R309 0RJ2202D677 22K OHM 1/10 W 5% 1608 R/TP...
  • Page 33 DATE: 2006. 02. 06. DATE: 2006. 02. 06. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R1061 0RJ2200D677 220 OHM 1/10 W 5% 1608 R/TP R166 0RJ0222D677 22 OHM 1/10 W 5% 1608 R/TP R1064 0RJ1001D677 1K OHM 1/10 W 5% 1608 R/TP...
  • Page 34 DATE: 2006. 02. 06. DATE: 2006. 02. 06. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R282 0RJ0222D677 22 OHM 1/10 W 5% 1608 R/TP R439 0RJ0000D677 0 OHM 1/10 W 5% 1608 R/TP R287 0RJ1001D677 1K OHM 1/10 W 5% 1608 R/TP...
  • Page 35 X600 6212AB2845A ABLS-27.000MHZ-16-B-4Y-F-T R975 0RJ0102D677 10 OHM 1/10 W 5% 1608 R/TP SW101 140-313A TACT 2LEAD 100G(TA) LG C&D R976 0RJ0102D677 10 OHM 1/10 W 5% 1608 R/TP TU1100 6700AN0002C TDVS-H702P LGIT ATSC/NTSC D R977 0RJ0102D677 10 OHM 1/10 W 5% 1608 R/TP...
  • Page 36 DATE: 2006. 02. 06. DATE: 2006. 02. 06. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C105 0CH5101K416 100PF 50V 5% NP0 2012 R/TP C213 0CH2103K516 10000PF 50V 10% B(Y5P) 2012 C107 0CH5220K416 22PF 50V 5% NP0 2012 R/TP...
  • Page 37 DATE: 2006. 02. 06. DATE: 2006. 02. 06. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION DIODEs 0RH0000D622 0 OHM 1 / 10 W 2012 5.00% D 0RH0000D622 0 OHM 1 / 10 W 2012 5.00% D D115 0DD184009AA KDS184 TP KEC - 85V - - - 3...
  • Page 38 220 OHM 1 / 10 W 2012 5.00% R1168 0RH1001D622 1K OHM 1 / 10 W 2012 5.00% SW200 6634D00010D TASA-H303P LG INNOTEK 75 OH R1169 0RH4701D622 4.7K OHM 1 / 10 W 2012 5.00 X100 6212AB3004D CSALF2M69G4ZF01-A3 MURATA 2...
  • Page 39 DATE: 2006. 02. 06. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION SIDE BOARD R101 0RH0000D622 0 OHM 1 / 10 W 2012 5.00% D R102 0RH0000D622 0 OHM 1 / 10 W 2012 5.00% D R103 0RH0000D622 0 OHM 1 / 10 W 2012 5.00% D R104 0RH0000D622 0 OHM 1 / 10 W 2012 5.00% D...
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  • Page 57 Feb., 2006 P/NO : 38289S0043C Printed in Korea...

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