Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html COLOR MONITOR SERVICE MANUAL CHASSIS NO. : CL-29 FACTORY MODEL: LB782G MODEL: LCD 782LS (LB782G-GD) *( ) ID LABEL MODEL No. CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CONTENTS SPECIFICATIONS ................................................... 2 PRECAUTIONS ....................................................... 3 TIMING CHART ....................................................... 4 OPERATING INSTRUCTIONS ................................ 5 WIRING DIAGRAM ................................................. 6 DISASSEMBLY ....................................................... 7 BLOCK DIAGRAM AND DESCRIPTION ................ 8 ADJUSTMENT .....................................
PRECAUTION WARNING FOR THE SAFETY-RELATED COMPONENT. WARNING • 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.
TIMING CHART VIDEO B A E C D SYNC F << Dot Clock (MHz), Horizontal Frequency (kHz), Vertical Frequency (Hz), Horizontal etc... (µs), Vertical etc... (ms) >> Mode 1 2 3 4 5 6 7 8 9 10 11 12 13 H/V Sort Sync Polarity H + V – H – V H + – V – H – V – H + V + H + V + H +/– V +/– H – V H – – V – H +/– V +/– H +/– V +/– H + V + H + V + DOT Clock 25.175 28.321 25.175 31.5 40.0 49.5 57.283 65.0 78.75 100.0 92.978 108.0 135.
OPERATING INSTRUCTIONS FRONT VIEW REAR VIEW AUDIOT OU DC D AUDIO DC OUT Power Connector Power ON/OFF Button Power (DPMS) Indicator D-Sub Signal Port Front Control Panel SET Button MENU Button Button AUTO Button Power Button Power Indicator 1. MENU Button Use this button to enter or exit the on screen display. 3. AUTO Button Use this button to enter a selection in the on screen display. 2.
WIRING DIAGRAM Connector Ass’y P/No.: 6631T11012W PG4 Connector Ass’y P/No.: 6631T25008R J706 J801 J702 Connector Ass’y P/No.: 6631T20008P J710 CN2 J1 CN1 CN3 Connector Ass’y P/No.
DISASSEMBLY BACK COVER REMOVAL ※ Caution: When you open the Back cover, Be careful! Dont stress the Control Board Connector. (a) (b) (b) (b) (a) (b) (b) (a) (b) (a) (b) (b) (b) (b) (b) Latch Point 1) Set the Monitor face downward. 2) Remove four screws (a). 3) Set the Monitor as picture. 4) Release the bottom & side latch. 5) Set the Monitor face upward. 6) Release the up side latch. 7) Release the center positon latch. 8) Set the Monitor face downward. 9) Remove the Back cover.
-8- 5.0V 12V 3.3V 2.
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. The pixel clock for each mode is generated by the PLL. The range of the pixel clock is from 25MHz to 135.0MHz.
BLOCK DIAGRAM POWER BOARD 12V 50 ~ 60Hz EMI COMPONENTS INPUT RECTIFIER AND FILTER HVDC ENERGY TRANSFER 100KHz OUTPUT RECTIFIER AND FILTER 5V GND LINE 100 ~ 240V PWM CONTROL CIRCUIT PHOTO-COUPLER ISOLATION SIGNAL COLLENTION SECONDA RY PRIMARY 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.
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. (eg. VG-819 made by Astrodesign Co.) - E(E)PROM with each mode data saved. 1. Adjustment Start 1) Display any pattern at any Mode.
TROUBLESHOOTING GUIDE 1. NO POWER NO POWER (POWER INDICATOR OFF) CHECK J801 INPUT VOLTAGE (12V) ? NO TROUBLE IN BULT-IN POWER NO TROUBLE IN BULT-IN POWER NO TROUBLE IN U501 or X501 YES CHECK J801 5VST VOLTAGE (5V) ? YES CHECK U501’s PIN 6.
2. NO RASTER NO RASTER CHECK J702 PIN 1, 2, 3 (12V) ? NO TROUBLE IN POWER ADATER or L703, L704 YES CHECK J702 PIN 8 (5V) ? NO TROUBLE IN INVON PATTERN NO TROUBLE IN X501 NO TROUBLE IN U201 NO TROUBLE IN U201 YES CHECK X501 H.
YES CHECK L204 PULSE ? NO TROUBLE IN U201 NO CHECK DOT CLOCK PATTERN NO CHECK DVS PATTERN NO CHECK DHS PATTERN YES CHECK U401 PIN 10 PULSE ? YES CHECK U401 PIN 8 V.PULSE? YES CHECK U401 PIN 7 V.
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C710 L810 D801 R562 R564 J801 R804 R805 30 C845 A L821 L811 R501 X501 C502 R450 40 U502 C501 C510 C503 R513 R508 R512 R580 C840 R511 R524 C517 R563 R544 C740 R560 R545 C508 C520 R534 R535 C522 R541 R520 R519 R518 R526 R810 C818 C506 C507 R536 R537 R523 L401 C504 R528 C515 C836 C835 R561 C812 C809 R542 C516 R543 L402 C509 R522 RA210 C519 R538 R516 C410 R402 R404 R540 C221 R405 C405 C403 C401 C402 L203 C257 C220 C238 R401 L403 C817 L823 ZD722 ZD721 C
4. POWER BOARD (Component Side) 5.
EXPLODED VIEW a b 3 15 11 12 13 8 7 10 6 9 5 14 4 c 2 1 - 19 -
EXPLODED VIEW PARTS LIST Description Ref. No. Part No. 1 3091TKL031H 2 6304FHD004A LCD(LIQUID CRYSTAL DISPLAY) HT17E11-300 HYUNDAI TFT COLOR SXGA 17 INCH LVDS 3 3809TKL021A 4 3043TKK037M TILT SWIVEL ASSEMBLY LB782F .
REPLACEMENT PARTS LIST CAUTION: BEFORE REPLACING ANY OF THESE COMPONENTS, READ CAREFULLY THE SAFETY PRECAUTIONS IN THIS MANUAL. * NOTE : S SAFETY Mark AL ALTERNATIVE PARTS *S *AL LOC. NO. PART NO. DATE: 2002. 6. 14. DESCRIPTION / SPECIFICATION *S *AL LOC. NO.
*S *AL LOC. NO. C831 C832 C833 C834 C835 C836 C837 C838 C839 C840 C845 C860 C870 C871 C872 C873 PART NO. DATE: 2002. 6. 14. DESCRIPTION / SPECIFICATION 0CH8107F611 0CK103CK51A 0CC102CK41A 0CH8107F611 0CC102CK41A 0CK103CK51A 0CK104CK56A 0CH8226F691 0CK104CK56A 0CE477EH618 0CE477EH618 0CK105CD56A 0CC102CK41A 0CC101CK41A 0CC102CK41A 0CC101CK41A 100UF 16V M 85STD(CYL) R/TP 0.01UF 1608 50V 10% R/TP B(Y5P) 1000PF 1608 50V 5% R/TP NP0 100UF 16V M 85STD(CYL) R/TP 1000PF 1608 50V 5% R/TP NP0 0.
*S *AL LOC. NO. PART NO. DATE: 2002. 6. 14. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DATE: 2002. 6. 14.
*S *AL LOC. NO. R928 T901 TH901 ZD901 PART NO. 0RD0202Q609 6170TMZ125A 6322TA080AA 0DZ470009BC DATE: 2002. 6. 14. DESCRIPTION / SPECIFICATION 20 1/4W(3 5% TA52 EER3016 340UH V-10PIN LB886F SC TP8D13 DAEWOO +/- 15% 110/220V GDZ4.7B TP GRANDE DO34 0.5W 4.
PIN CONFIGURATION CAT24WC08J-TE13 8P BLOCK DIAGRAM DIP Package(p) SOIX Package(J) EXTERNAL LOAD A0 1 8 1 8 2 7 VCC WP A0 A1 A1 2 7 VCC WP A2 3 6 SCL A2 3 6 SCL V SS 4 5 SDA V SS 4 5 SDA SENSE AMPS SHIFT REGISTERS D OUT ACK V CC V SS COLUMN DECODERS WORD ADDRESS BUFFERS TSSOP Package(U) SDA A0 1 8 A1 2 7 A2 V SS 3 6 SCL 4 5 SDA START/STOP LOGIC VCC WP E 2 PROM XDEC WP CONTROL LOGIC PIN CONFIGURATION PIN FUNCTION DATA IN STORAGE Pin Name Function A0, A
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P/NO : 3828TSL074E Jun.
