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LG Electronics LCD 782LS manual

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Table of contents for the manual

  • Page 1

    COLOR MONIT OR SER VICE MANUAL Website:http://biz.LGservice.com E-mail:http://www .LGEservice.com/techsup.html CAUTION BEFORE SERVICING THE UNIT , READ THE SAFETY PRECAUTIONS IN THIS MANUAL. CHASSIS NO. : CL-29 F ACTOR Y MODEL: LB782G MODEL: LCD 782LS (LB782G-GD) *( ) ID LABEL MODEL No.[...]

  • Page 2

    CONTENTS - 2 - SPECIFICA TIONS ................................................... 2 PRECAUTIONS ....................................................... 3 TIMING CHART ....................................................... 4 OPERA TING INSTRUCTIONS ................................ 5 WIRING DIAGRAM ................................................. [...]

  • Page 3

    - 3 - 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, fir[...]

  • Page 4

    TIMING CHART - 4 - VIDEO SYNC B D C F E A H + 31.469 800 640 16 96 48 V – 70.09 449 350 37 2 60 H – 31.469 800 640 16 96 48 V – 59.94 525 480 10 2 33 H – 37.5 840 640 16 64 120 V – 75 500 480 1 3 16 H – 31.468 900 720 18 108 54 V + 70.08 449 400 12 2 35 H + 37.879 1056 800 40 128 88 V + 60.317 628 600 1 4 23 H + 46.875 1056 800 16 80 16[...]

  • Page 5

    - 5 - 1. MENU Button Use this button to enter or exit the on screen display. 2. Use these buttons to choose or adjust items in the on screen display 3. AUTO Button Use this button to enter a selection in the on screen display. 4. OPERA TING INSTRUCTIONS Front Control Panel FRONT VIEW REAR VIEW D AUDIO DC OUT D-Sub Signal Port Power Connector AUDIO [...]

  • Page 6

    - 6 - WIRING DIAGRAM J801 PG4 J702 CN1 CN3 J1 CN2 Connector Ass ’ y P/No.: 6631T1 1012W Connector Ass ’ y P/No.: 6631T25008R Connector Ass ’ y P/No.: 6631T20015A Connector Ass ’ y P/No.: 6631T20008P J706 J710[...]

  • Page 7

    - 7 - DISASSEMBL Y (a) (a) (a) (a) 1) Set the Monitor face downward. 2) Remove four screws (a). BACK COVER REMOVAL 3) Set the Monitor as picture. 4) Release the bottom & side latch. 7) Release the center positon latch. 5) Set the Monitor face upward. 6) Release the up side latch. 8) Set the Monitor face downward. 9) Remove the Back cover. ※ C[...]

  • Page 8

    BLOCK DIAGRAM - 8 - To Inverter 12V BRT -CTL Tx+/-,Hs,Vs,CLK,DEN INV -CTL EEPROM (SYSTEM) Analog Signal ADC + PLL OSD Scaling GM5020 DC/DC Block Regulator Regulator 2.5V 3.3 V MCU L VDS Tx POWER BOARD DDC (EDID) 12V(Inverter) 5.0V 90-264V 12V Module Power (5V) DSUB (H/V Sync) (R,G,B) SDA, SCL H SYNC AC INPUT[...]

  • Page 9

    DESCRIPTION OF BLOCK DIAGRAM - 9 - 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. The pixel clock for each mode is generated by the PLL[...]

  • Page 10

    BLOCK DIAGRAM - 10 - EMI COMPONENT S LINE 100 ~ 240V INPUT RECTIFI E R AND FILTER ENERGY TRANSFER OUTPUT RECTIF IE R AND FILTER 12V 5V GND SIGNAL COLLENTION PHOTO - COUPLER ISOLATI ON PWM CONTRO L CIRCUIT HVD C 10 0KHz PRIMARY SECONDA RY 50 ~ 60 Hz POWER BOARD DESCRIPTION OF BLOCK DIAGRAM 1. EMI components. This part contains of EMI components to c[...]

  • Page 11

    ADJUSTMENT - 11 - 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. (eg. VG[...]

  • Page 12

    - 12 - TROUBLESHOOTING GUIDE 1. NO POWER TROUBLE IN BULT-IN POWER CHECK J801 5VST VOLTAGE (5V) ? NO NO POWER (POWER INDICATOR OFF) TROUBLE SOMEWHERE ELSE TROUBLE IN BULT-IN POWER CHECK J801 INPUT VOLTAGE (12V) ? NO TROUBLE IN U501 or X501 NO YES YES YES CHECK U501 ’ s PIN 6. IS THIS PIN OSCILLATED?[...]

  • Page 13

    - 13 - 2. NO RASTER TROUBLE IN INVON PATTERN CHECK J702 PIN 8 (5V) ? NO NO RASTER TROUBLE IN POWER ADATER or L703, L704 CHECK J702 PIN 1, 2, 3 (12V) ? NO TROUBLE IN X501 CHECK X501 H. PULSE ? NO TROUBLE IN U201 CHECK U201(GM5020) ? NO TROUBLE IN U201 NO YES YES YES YES CHECK L201, L202, L203 PULSE?[...]

  • Page 14

    - 14 - CHECK DOT CLOCK PATTERN NO TROUBLE IN U201 NO CHECK DVS PATTERN NO CHECK DHS PATTERN NO YES YES YES YES YES TROUBLE IN LCD MODULE CHECK U401 PIN 8 V.PULSE? CHECK U401 PIN 7 V.PULSE? CHECK U401 PIN 10 PULSE ? CHECK L204 PULSE ?[...]

  • Page 15

    - 15 - 3. NO CLOCK (CLOCK GENERA TOR) NO DOT CLOCK TROUBLE IN X201 CHECK X201 24MHz ? NO TROUBLE IN U201 CHECK L201 CLOCK ? NO YES YES[...]

  • Page 16

    - 16 - 4. TROUBLE IN DPM TROUBLE IN DPM TROUBLE IN PC CHECK PC PC IS NOT GOING INTO DPM OFF MODE NO TROUBLE IN X501 NO TROUBLE IN SIGNAL CABLE NO YES YES YES CHECK U501 PIN 6 WAVEFORM (24MHz) ? CHECK R233, R234? CHECK U501 PIN 11 (0V) ?[...]

  • Page 17

    PRINTED CIRCUIT BOARD - 17 - 1. MAIN BOARD (Component Side) C860 R526 L822 R809 C820 C506 U802 C819 J706 R732 J710 R707 Q705 R706 D730 R713 R705 C840 R531 C511 R529 R527 R580 R508 R511 R512 R513 R524 R525 C818 C504 C505 C507 C514 C515 R810 C408 L823 C405 C403 50 40 30 C402 C401 1 C413 L403 ZD721 C730 R730 ZD722 C731 C729 R731 R708 R709 C703 C702 R7[...]

  • Page 18

    - 18 - 4. POWER BOARD (Component Side) 5. POWER BOARD (Solder Side)[...]

  • Page 19

    - 19 - 1 2 5 6 13 3 9 14 4 12 10 8 7 11 15 a b c EXPLODED VIEW[...]

  • Page 20

    EXPLODED VIEW P ARTS LIST - 20 - Ref. No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 a b c Part No. 3091TKL031H 6304FHD004A 3809TKL021A 3043TKK037M 4951TKS082F 6633TZA011A 4814TKK200A 3313TL7004B 6631T11012W 6871TST276A 6871TPT220A 4814TKK187A 4950TKS189A 3550TKK053A 6850TD9001A 1SZZTAT001A 332-095C 332-105F Description CABINET ASSEMBLY, LB782G BRAND ANAL[...]

  • Page 21

    - 21 - DATE: 2002. 6. 14. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C201 0CK103CK51A 0.01UF 1608 50V 10% R/TP B(Y5P) C202 0CK103CK51A 0.01UF 1608 50V 10% R/TP B(Y5P) C203 0CK103CK51A 0.01UF 1608 50V 10% R/TP B(Y5P) C204 0CK103CK51A 0.01UF 1608 50V 10% R/TP B(Y5P) C205 0CK103CK51A 0.01UF 1608 50V 10% R/TP B(Y5P) C206 0CK103CK51A 0.01UF 16[...]

  • Page 22

    DATE: 2002. 6. 14. *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 0CK103CK51A 0.01UF 1608 50V 10% R/TP B(Y5P) [...]

  • Page 23

    DATE: 2002. 6. 14. *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 R539 0RJ4701D677 4.7K OHM 1/10 W 5% 1608 R/TP R540 0RJ0[...]

  • Page 24

    DATE: 2002. 6. 14. *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 R1 0RD4701Q609 4.70K 1/4W(3 5% TA52 R2 0RD4701Q609 4.70K 1/4W(3 5% TA52 R3 0RD8200Q609 820 1/4W[...]

  • Page 25

    PIN CONFIGURA TION - 25 - CA T24WC08J-TE13 8P A 0 A 1 A 2 V SS V CC WP SCL SDA A 0 A 1 A 2 V SS V CC WP SCL SDA 1 2 3 4 8 7 6 5 1 2 3 4 8 7 6 5 A 0 A 1 A 2 V SS V CC WP SCL SDA 1 2 3 4 8 7 6 5 EXTERNAL LOAD SDA WP D OUT SENSE AMPS SHIFT REGISTERS WORD ADDRESS BUFFERS COLUMN DECODERS ST ART/STOP LOGIC XDEC DA T A IN STORAGE HIGH VOL T AGE/ TIMING CO[...]

  • Page 26

    SCHEMA TIC DIAGRAM - 26 - 1. GM5020[...]

  • Page 27

    - 27 - 2. L VDS[...]

  • Page 28

    - 28 - 3. MICOM[...]

  • Page 29

    - 29 - 4. DC/DC[...]

  • Page 30

    - 30 - 5. CONNECTOR[...]

  • Page 31

    - 31 - 6. CONTROL[...]

  • Page 32

    - 32 - 7. POWER[...]

  • Page 33

    Jun. 2002 P/NO : 3828TSL074E Printed in Korea[...]