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LG 37LC2D Service Manual
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LG 37LC2D Service Manual

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See also: Owner's Manual , User Manual
LCD TV

SERVICE MANUAL

CHASSIS : LT61A
FACTORY NAME : 37LC2D-DA
MODEL : 37LC2D
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 37LC2D

  • Page 1: Service Manual

    LCD TV SERVICE MANUAL CHASSIS : LT61A FACTORY NAME : 37LC2D-DA MODEL : 37LC2D 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 ..............9 TROUBLE SHOOTING ................13 BLOCK DIAGRAM...................16 EXPLODED VIEW .................. 18 REPLACEMENT PARTS LIST ............... 20 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

    Tuner IF 1) NTSC-M : 45.75MHz(Picture) 41.25MHz(Sound) 2) DVB-T : 36.125MHz Input Voltage AC 110V, 60Hz Maker : LGE LCD Module LC370WX1-SL11(1366X768) Maker : LG Philips LCD Aspect ratio 16:9(wide) Operating Temperature Operating Humidity Storage Temperature Storage Humidity - 6 -...
  • Page 7 5. Chroma & Brightness Item Unit Remark Brightness cd/m Contrast Ratio 400:1 600:1 Luminance Variation Viewing Angle(Left, Right, Up, Down) Degree Color coordinate 0.640 - 0.03 0.341 + 0.03 GREEN 0.287 0.610 BLUE 0.146 0.069 WHITE 0.285 (Standard) 0.293 Color Temperature Medium 8,300 9,300...
  • Page 8 8. General specifications(module) Item Unit Remark Active Screen Size 940.3(diagonal) 37.02 inches Outline Dimension 877(H) x 516.8(V) x 55.5(D) Typ. Pixel Pitch 200 x 600 x RGB Pixel Format 1366(H)x768(V) RGB stripe arrangement Color Depth 8bit 16.7 Mbit Luminance ,White cd/m2 Center 1 point Viewing Angle (CR>10)

  • Page 9: Adjustment Instruction

    ADJUSTMENT INSTRUCTION 1. Application Range 4. ADC Calibration This spec. sheet is applied to all of the LT61A chassis RF/VIDEO/S-VIDEO Component manufactured at LG TV Plant all over the world. MSPG925F VIDEO1 Model: 217(720P) Model: 39 Model: 201 (NTSC-M) Pattern: 33 (1024*768 60Hz) 2.

  • Page 10: White Balance

    4.2.1 Method of Auto Component Color Balance Before White-balance, the AV ADC should be done. 1) Input the Component 720p 100% Color Bar(MSPG-925F Notice : Before White-balance, change input mode model:215, pattern:33) signal into Component. - Move to VIDEO1 by using Remote controller 2) Set the EZ PICTURE to Optimum mode in the Picture menu.
  • Page 11 6. Shipping Conditions Item Condition Remark Sound EZ SOUND FLAT 6.1 Input the Shipping Option Data 1) Push the IN-START key in the Adjust Remocon. 2) Change the General Option value to "20". Balance 2-1) Select "General Option" by using D /E (CH+/-) key , Treble and press the number key(0~9) consecutively Bass...

  • Page 12: 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 13: Troubleshooting

    TROUBLESHOOTING NO POWER (POWER INDICATOR OFF) CHECK CN804 CHECK POWER BOARD VOLTAGE (P-ST_5V) CHECK CRYCTAL CHECK CRYSTAL X800 X800(19.6608MHZ) CHECK IC806 VOLTAGE (5V) CHECK IC806 CHECK Power on/off CHECK Q1001 (5V) REPLACE POWER BOARD - 13 -...
  • Page 14 NO VIDEO CHECK THE PERIPHERAL CHECK LVDS Output IC800 P3(PIN 21, PIN 22) CHECK THE PERIPHERAL Check L2 (12V) CHECK L1022 CHECK R898 (24V) (3.3V) REPLACE LCD MODULE DOWN LOAD ISP DATA or REPLACE MAIN BOARD - 14 -...
  • Page 15 NO SOUND IS THE SPK CABLE INSERT CABLES WELL CONNECTED WELL? DOES IC302 OPERATE? CHECK IC302 OR CHANGE DOES IC301 OPERATE? CHECK IC301 OR CHANGE CHECK X300 OR CHANGE DOES IC300 OPERATE? CHECK X400 OR CHANGE DOES IC400 OPERATE? REPLACE JACK BOARD - 15 -...

  • Page 16: Block Diagram

    BLOCK DIAGRAM(VIDEO) - 16 -...
  • Page 17 BLOCK DIAGRAM(AUDIO) - 17 -...

  • Page 18: Exploded View

    EXPLODED VIEW - 18 -...

  • Page 19: Exploded View Parts List

    Plate, FRAME MAIN 37LC2D-DA 6709900016D SMPS,AC/DC, LGLP2637HEP 90.0VTO264.0V 215W 47TO63HZ UL/CSA/SEMKO YY / AT / HE or 6709900016B Power Supply Assembly, FREE H3/E2 LCD MODEL LCD LG ELECTRONICS LB LC 37INCH 31419MNV37A Chassis Assembly, MAIN LT61A TAIWAN DTV 37LC2D-DA MAIN LEVEL 68719STA79A PCB Assembly,Sub, SUB T.T LT61A 37LC2D-DA TOTAL IDTV DIGITAL RECEIVER MODULE...

  • Page 20: 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 21 DATE: 2006. 07. 04. DATE: 2006. 07. 04. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C249 0CE107WF6DC MVK6.3TP16VC100M 100uF 20% C1036 0CH3104K566 0805B104K500CT 100nF 10% 50 C252 0CE105WK6DC MVK4.0TP50VC1M 1uF 20% 50V C1038 0CH3104K566 0805B104K500CT 100nF 10% 50 C253...
  • Page 22 DATE: 2006. 07. 04. DATE: 2006. 07. 04. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C1147 0CH3104K566 0805B104K500CT 100nF 10% 50 C1227 0CH3104K566 0805B104K500CT 100nF 10% 50 C1149 0CH3104K566 0805B104K500CT 100nF 10% 50 C1228 0CH3104K566 0805B104K500CT 100nF 10% 50 C115...
  • Page 23 DATE: 2006. 07. 04. DATE: 2006. 07. 04. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C1306 0CH3104K566 0805B104K500CT 100nF 10% 50 C354 0CH3104K566 0805B104K500CT 100nF 10% 50 C131 0CH3104K566 0805B104K500CT 100nF 10% 50 C355 0CH3104K566 0805B104K500CT 100nF 10% 50 C1315...
  • Page 24 DATE: 2006. 07. 04. DATE: 2006. 07. 04. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C632 0CH3104K566 0805B104K500CT 100nF 10% 50 C931 0CH3104K566 0805B104K500CT 100nF 10% 50 C634 0CH6102K406 C2012S2L1H102JT 1nF 5% 50V C932 0CH3103K516 C2012Y5P1H103KT 10nF 10% 50 C635...
  • Page 25 DATE: 2006. 07. 04. DATE: 2006. 07. 04. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C412 0CK474DH56A C2012X7R1E474KT 470nF 10% 2 D1006 0DS226009AA KDS226 1.2V 85V 300MA 2A 4N C415 0CK474DH56A C2012X7R1E474KT 470nF 10% 2 D1009...
  • Page 26 DATE: 2006. 07. 04. DATE: 2006. 07. 04. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION COIL & CORE & INDUCTOR L302 6210TCE001G HH-1M3216-501JT 500OHM 3.2X L303 6140VB0022A DN-42LZ30 22.8uH - - 18X20M L308 6210TCE001G HH-1M3216-501JT 500OHM 3.2X L304...
  • Page 27 DATE: 2006. 07. 04. DATE: 2006. 07. 04. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION Q1003 0TR387500AA 2SC3875S(ALY) NPN 5V 60V 50 R1020 0RH4701D622 MCR10EZHJ472 4.7KOHM 5% 1/8 Q102 0TR387500AA 2SC3875S(ALY) NPN 5V 60V 50 R1021 0RH1001D622 MCR10EZHJ102 1KOHM 5% 1/8W...
  • Page 28 DATE: 2006. 07. 04. DATE: 2006. 07. 04. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R279 0RH1000D622 MCR10EZHJ101 100OHM 5% 1/8W R355 0RH4701D622 MCR10EZHJ472 4.7KOHM 5% 1/8 R287 0RH1002D622 MCR10EZHJ103 10KOHM 5% 1/8W R356 0RH1000D622 MCR10EZHJ101 100OHM 5% 1/8W R295...
  • Page 29 DATE: 2006. 07. 04. DATE: 2006. 07. 04. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R785 0RH1000D622 MCR10EZHJ101 100OHM 5% 1/8W R163 0RH6202D622 MCR10EZHJ623 62KOHM 5% 1/8W R786 0RH1002D622 MCR10EZHJ103 10KOHM 5% 1/8W R164 0RH2201D622 MCR10EZHJ222 2.2KOHM 5% 1/8 R802...
  • Page 30 DATE: 2006. 07. 04. DATE: 2006. 07. 04. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R3230 0RH0000D622 MCR10EZHJ000 0OHM 5% 1/8W 2 R606 0RH4701D622 MCR10EZHJ472 4.7KOHM 5% 1/8 R336 0RH2200D622 MCR10EZHJ221 220OHM 5% 1/8W R607 0RH1002D622 MCR10EZHJ103 10KOHM 5% 1/8W...
  • Page 31 DATE: 2006. 07. 04. DATE: 2006. 07. 04. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION OTHERs R780 0RH2701D622 MCR10EZHJ272 2.7KOHM 5% 1/8 R781 0RH2701D622 MCR10EZHJ272 2.7KOHM 5% 1/8 X300 6202VDT002H SX-1 18.432MHZ 30PPM 18.432 R782 0RH0222D622 MCR10EZHJ220 22OHM 5% 1/8W...
  • Page 37 Jul., 2006 P/NO : MFL30105536 Printed in Korea...

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