LG LCD 782LS Service Manual
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LG LCD 782LS Service Manual

LG LCD 782LS Service Manual

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COLOR MONITOR

SERVICE MANUAL

CHASSIS NO. : CL-29
FACTORY MODEL: LB782G
MODEL:
*(
) ID LABEL MODEL No.
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
Website:http://biz.LGservice.com
E-mail:http://www.LGEservice.com/techsup.html
LCD 782LS
(LB782G-GD)

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Summary of Contents for LG LCD 782LS

  • Page 1: Color Monitor

    COLOR MONITOR SERVICE MANUAL CHASSIS NO. : CL-29 FACTORY MODEL: LB782G MODEL: ) ID LABEL MODEL No. CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html LCD 782LS (LB782G-GD)

  • Page 2: Table Of Contents

    SPECIFICATIONS ... 2 PRECAUTIONS ... 3 TIMING CHART ... 4 OPERATING INSTRUCTIONS ... 5 WIRING DIAGRAM ... 6 DISASSEMBLY ... 7 BLOCK DIAGRAM AND DESCRIPTION ... 8 1. LCD CHARACTERISTICS Type : TFT Color LCD Module Size : 17.0 inch (43.2 cm diagonal) Pixel Pitch : 0.264(H) x 0.264(V) Elecctrical Interface...

  • Page 3: Precautions

    WARNING FOR THE SAFETY-RELATED COMPONENT. • There are some special components used in LCD monitor that are important for safety. These parts are marked on the schematic diagram and the replacement parts list. It is essential that these critical parts should be replaced with the manufacturer’s specified parts to prevent electric shock, fire or other hazard.

  • Page 4: Timing Chart

    VIDEO SYNC << Dot Clock (MHz), Horizontal Frequency (kHz), Vertical Frequency (Hz), Horizontal etc... (µs), Vertical etc... (ms) >> Sync Mode Frequency Clock Polarity Sort 31.469 25.175 – 70.09 – 31.468 28.321 70.08 – 31.469 25.175 – 59.94 – 37.5 31.5 –...

  • Page 5: Operating Instructions

    OPERATING INSTRUCTIONS FRONT VIEW Power ON/OFF Button Power (DPMS) Indicator AUTO Button 1. MENU Button Use this button to enter or exit the on screen display. Button Use these buttons to choose or adjust items in the on screen display <Shortcut Keys>...

  • Page 6: Wiring Diagram

    WIRING DIAGRAM Connector Ass’y P/No.: 6631T25008R J801 J702 Connector Ass’y P/No.: 6631T20015A Connector Ass’y P/No.: 6631T11012W J706 J710 - 6 - Connector Ass’y P/No.: 6631T20008P...

  • Page 7: Disassembly

    BACK COVER REMOVAL ※ Caution: When you open the Back cover, Be careful! Dont stress the Control Board Connector. 1) Set the Monitor face downward. 2) Remove four screws (a). 5) Set the Monitor face upward. 6) Release the up side latch. DISASSEMBLY (b) Latch Point 8) Set the Monitor face downward.

  • Page 8: Block Diagram And Description

    BLOCK DIAGRAM - 8 -...

  • Page 9: Description Of Block Diagram

    DESCRIPTION OF BLOCK DIAGRAM 1. Input signal part. There is one input which is analog. It comes from 15 pin D-Sub connector. 2. Pre-amp/ ADC / PLL / Video Controller. This part amplifies the level of video signal from the analog video signal to the digital video signal using a pixel clock.

  • Page 10: Block Diagram

    POWER BOARD 50 ~ 60Hz COMPONENTS LINE 100 ~ 240V DESCRIPTION OF BLOCK DIAGRAM 1. EMI components. This part contains of EMI components to comply with global marketing EMI standards like FCC the circuit included a line-filter, across line capacitor and of course the primary protection fuse. 2.

  • Page 11: Adjustment

    All adjustment are thoroughly checked and corrected when the monitor leaves the factory, but sometimes several minor adjustment may be required. Adjustment should be following procedure and after warming up for a minimum of 10 minutes. • Alignment appliances and tools. - IBM compatible PC - Programmable Signal Generator.

  • Page 12: Troubleshooting Guide

    TROUBLESHOOTING GUIDE NO POWER (POWER INDICATOR OFF) CHECK J801 INPUT VOLTAGE (12V) ? CHECK J801 5VST VOLTAGE (5V) ? CHECK U501’s PIN 6. IS THIS PIN OSCILLATED? TROUBLE SOMEWHERE ELSE 1. NO POWER - 12 - TROUBLE IN BULT-IN POWER TROUBLE IN BULT-IN POWER TROUBLE IN...
  • Page 13 2. NO RASTER NO RASTER CHECK J702 PIN 1, 2, 3 (12V) ? CHECK J702 PIN 8 (5V) ? CHECK X501 H. PULSE ? CHECK U201(GM5020) ? CHECK L201, L202, L203 PULSE? TROUBLE IN POWER ADATER or L703, L704 TROUBLE IN INVON PATTERN TROUBLE IN X501...
  • Page 14 CHECK L204 PULSE ? CHECK U401 PIN 10 PULSE ? CHECK U401 PIN 8 V.PULSE? CHECK U401 PIN 7 V.PULSE? TROUBLE IN LCD MODULE TROUBLE IN U201 CHECK DOT CLOCK PATTERN CHECK DVS PATTERN CHECK DHS PATTERN - 14 -...
  • Page 15 3. NO CLOCK (CLOCK GENERATOR) NO DOT CLOCK CHECK X201 24MHz ? CHECK L201 CLOCK ? TROUBLE IN X201 TROUBLE IN U201 - 15 -...
  • Page 16 4. TROUBLE IN DPM TROUBLE IN DPM CHECK R233, R234? CHECK U501 PIN 6 WAVEFORM (24MHz) ? CHECK U501 PIN 11 (0V) ? TROUBLE IN PC CHECK PC PC IS NOT GOING INTO DPM OFF MODE TROUBLE IN X501 TROUBLE IN SIGNAL CABLE - 16 -...

  • Page 17: Printed Circuit Board

    PRINTED CIRCUIT BOARD 1. MAIN BOARD (Component Side) C829 C830 L804 C832 C272 C273 C833 C275 C274 C205 C276 R222 C280 R223 C260 R224 C259 R220 C279 R221 C278 R225 C261 C219 C226 C227 C258 C230 ZD703 ZD704 ZD711 R233 R234 R206 R216...
  • Page 18 4. POWER BOARD (Component Side) 5. POWER BOARD (Solder Side) - 18 -...

  • Page 19: Exploded View

    EXPLODED VIEW - 19 -...

  • Page 20: Exploded View Parts List

    BACK COVER ASSEMBLY, LB782F 3808TKL026 PC+ABS 3809TKL021A TILT SWIVEL ASSEMBLY LB782F . NO USB 3043TKK037M METAL ASSEMBLY, FRAME LB782G -HYDIS MODULE 4951TKS082F INVERTER ASSEMBLY, LG-PHILIPS NMC1804,4-LAMP AU MODULE LB782 6633TZA011A SHIELD INVERTER LB782F 4814TKK200A MAIN TOTAL ASSEMBLY LB782G BRAND CL-36 3313TL7004B...

  • Page 21: Replacement Parts List

    CAUTION: BEFORE REPLACING ANY OF THESE COMPONENTS, READ CAREFULLY THE SAFETY PRECAUTIONS IN THIS MANUAL. * NOTE SAFETY Mark AL ALTERNATIVE PARTS *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION MAIN BOARD CAPACITORS C201 0CK103CK51A 0.01UF 1608 50V 10% R/TP B(Y5P) C202 0CK103CK51A 0.01UF 1608 50V 10% R/TP B(Y5P)
  • Page 22 *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C831 0CH8107F611 100UF 16V M 85STD(CYL) R/TP C832 0CK103CK51A 0.01UF 1608 50V 10% R/TP B(Y5P) C833 0CC102CK41A 1000PF 1608 50V 5% R/TP NP0 C834 0CH8107F611 100UF 16V M 85STD(CYL) R/TP C835 0CC102CK41A 1000PF 1608 50V 5% R/TP NP0 C836...
  • Page 23 *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R534 0RJ1001D677 1K OHM 1/10 W 5% 1608 R/TP R535 0RJ0000D677 0 OHM 1/10 W 5% 1608 R/TP R536 0RJ1000D677 100 OHM 1/10 W 5% 1608 R/TP R537 0RJ1000D677 100 OHM 1/10 W 5% 1608 R/TP R538 0RJ4701D677 4.7K OHM 1/10 W 5% 1608 R/TP...
  • Page 24 *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R928 0RD0202Q609 20 1/4W(3 5% TA52 T901 6170TMZ125A EER3016 340UH V-10PIN LB886F SC TH901 6322TA080AA TP8D13 DAEWOO +/- 15% 110/220V ZD901 0DZ470009BC GDZ4.7B TP GRANDE DO34 0.5W 4.7 CONTROL BOARD 0RD4701Q609 4.70K 1/4W(3 5% TA52 0RD4701Q609 4.70K 1/4W(3 5% TA52...

  • Page 25: Pin Configuration

    DIP Package(p) SOIX Package(J) V CC V SS V SS TSSOP Package(U) V SS PIN CONFIGURATION PIN FUNCTION Pin Name Function A0, A1, A2 Device Adress Inputs Serial Data/Address Serial Clock Write Protect +1.8V to + 6.0V power Supply Ground BA033 Low Saturation Voltage type 3-terminal Regulator 1.

  • Page 26: Schematic Diagram

    SCHEMATIC DIAGRAM 1. GM5020 - 26 -...
  • Page 27 2. LVDS - 27 -...
  • Page 28 3. MICOM - 28 -...
  • Page 29 4. DC/DC - 29 -...
  • Page 30 5. CONNECTOR - 30 -...
  • Page 31 6. CONTROL - 31 -...
  • Page 32 7. POWER - 32 -...
  • Page 33 Jun. 2002 P/NO : 3828TSL074E Printed in Korea...

This manual is also suitable for:

Flatron lb782gFlatron lb782g-gdFlatron lcd lb782g

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