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Daewoo L500B1, Service Manual, Page: 18 / 36

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Daewoo L500B1 Service Manual Download Page 18

16

2. Trouble in Power on

No

No

Yes

Yes

Is 5VS line

 normal?

Trouble in U3 & Q1

and its ambient circuit.

Trouble in SQ1 and 

its ambient circuit. 

Check on U1(scalier)

Is Power LED

on or off?

Off

No

Yes

On

Check the output

voltage

of adapter.

Refer to No video

or No raster.

Trouble

in the adapter.

Is the pulse

of pin 7

of    -com.

Summary of Contents for L500B1

Page 1: ...DAEWOO ELECTRONICS CO LTD http svc dwe co kr Service Manual XGA COLOR MONITOR Model L500B1 November 2000 ...

Page 2: ...ION 6 GENERAL INFORMATION 7 PIN CONNECTOR 8 CAUTIONS FOR ADJUSTMENT AND REPAIR 8 OPERATION ADJUSTMENT 9 ALIGNMENT PROCEDURE 14 TROUBLESHOOTING HINTS 15 BLOCK DIAGRAM 22 PCB LAYOUT 23 SCHEMATIC DIAGRAM 27 EXPLODED VIEW MECHANICAL PARTS LIST 28 INFORMATION OF PART DESCRIPTION 29 ELECTRICAL PARTS LIST 30 ...

Page 3: ...ential that these critical parts should be replaced with manufacturer s specified parts to prevent X Ray shock fire or other hazards Do not modify the original design without getting written permission from DAEWOO ELECTRONICS CO or this will void the original parts and labor warranty CAUTION No modifications of any circuits should be attempted Service work should be performed only after you are th...

Page 4: ...sult in damage to the equipment or other property WARNING Statements identify conditions or practices that could result in personal injury or loss of life Terms as marked on equipment CAUTION Statements indicate a personal injury hazard not immediately accessible as one reads the marking or a hazard which is properly included on the equipment itself WARNING Statements are clearly concerning indica...

Page 5: ...to the contacts with a pipe cleaner cotton tipped stick or comparable nonabrasive applicator 10 by volume Aceton and 90 by volume isopropyl alchohol 90 99 strength 6 Do not damage any plug socket B voltage interlocks with which instruments covered by this service manual might be equipped 7 Do not apply AC power to this instrument and or any other of its electrical assemblies unless all the solid s...

Page 6: ...ES devices are packaged with leads electrically shorted together by conductive foam aluminum foil or comparable conductive material 7 Immediately before removing the protective material from the leads of replacement ES devices touch the protective material to the chassis or circuit assembly into which the device will be installed 8 Minimize bodily movements when handling unpackaged replacement ES ...

Page 7: ...cuit board 2 Carefully bend each IC lead against the circuit foil pad and solder it 3 Clean the soldered areas with a small wire bristle brush lt is not necessary to reapply acrylic coating to the area Small Signal Discrete Transistor Removal Replacement 1 Remove the defective transistor by clipping its leads as close as possible to the component body 2 Bend the ends of each of three leads remaini...

Page 8: ...er side If they are not shiny reheat them and apply additional solder if necessary TECHNICAL INFORMATION Panel Size 15 1 inch 38cm diagonol Pixel Pitch 0 3 x 0 3 mm Synchronization Horizontal 30 62 KHz Vertical 50 85 Hz Plug and Play DDC1 2B CI Power Saving EPA VESA DPMS Nutek Compliant Power Source 100 240 Vac 50 60Hz Free Voltage DC12V 3A Power Consumption 21W without adapter 26W with adapter Di...

Page 9: ...um horizontal resolution of 1024 dots and a maximum vertical resolution of 768 lines for superior clarity of display By accepting analog signal inputs which level is zero to 0 7 Volts This TFT LCD monitor can display and 262 144 colors depending on the graphics adapter and software being used available used to 8 bit panel is 16 7M colors Abbreviations ADJ Adjustment AFC Automatic Frequency Control...

Page 10: ...nly electrical specification or function Reform the leadwire after any repair work Caution For Servicing In case of servicing or replacing CRT high voltage sometimes remains in the anode of the CRT Completely discharge high voltage before servicing or replacing CRT to prevent a shock to the serviceman Arrangement of 15 pin D sub connector 8 Pin Signal 1 Red 2 Green 3 Blue 4 GND 5 GND 6 GND Red 7 G...

Page 11: ...n the OSD window The MENU button turns the OSD window on This button moves from top menu to sub menu in the OSD window The button moves cursor to the left or high window in the OSD window This button decreases the value of any selected function The button moves cursor to the right or low window in the OSD window This button increases the value of any selected function AUTO EXIT MENU BRIGHTNESS BRI...

Page 12: ...10 Key Process OSD OFF MENU EXIT EXIT MENU EXIT MENU ...

Page 13: ...ontrol Perform the AUTO POSITION Is the H Size proper Is the noise displayed on the screen Perform the AUTO TRACKING Is the noise displayed on the screen yet Is the noise displayed on the screen yet Adjust the CLOCK FINE until the screen is cleared Yes Yes Yes Yes Yes No No No No No End ...

Page 14: ...n proceed to scaling up Adjust the horizontal vertical picture image quality and size Select language for OSD 5 languages LANGUAGE Adjust the position of the display horizontally left or right and vertically up or down H CENTER V CENTER Choose different preset color temperatures or set your own customized color parameters Adjust the width horizontal size of the screen image Sharpen the focus by al...

Page 15: ...atus of the monitor is No Signal or Out of range No Signal screen is displayed when the D Sub signal connector is not connected or the status of the monitor is on DPMS mode Out of Range screen is displayed when the applied frequency is under or over normal range Normal range Non interlaced mode only H 30 62 KHz 1024 dot Max V 50 85 Hz 768 dot Max ...

Page 16: ...y non interlace mode Adjustment 1 Smart scaling set to 69 2 Contrast set to 100 3 Brightness set to 50 4 Switching to factory alignment mode Press power key with Auto key at the power off status 5 Video level adjustment Receive stair pattern of 16 step doesn t care any mode Readjust coarse R G B in TDA8752 menu before saturaton point 6 Set up the tracking See the user s manual at page 8th 7 Switch...

Page 17: ...OOTING HINTS 1 Abnormal mode detect Is a input H sync of ADC correct Abnormal mode detect No No Yes Yes Is waveform of pin 84 of ADC correct Trouble in the H sync input circuit Trouble in ADC Trouble in Scalier Yes ...

Page 18: ...l Trouble in U3 Q1 and its ambient circuit Trouble in SQ1 and its ambient circuit Check on U1 scalier Is Power LED on or off Off No Yes On Check the output voltage of adapter Refer to No video or No raster Trouble in the adapter Is the pulse of pin 7 of com ...

Page 19: ...s 12V plugged in pin 1 of CN2 No No Yes Yes Is the output of inverter correct Check 12V line of CN3 Replace the inverter Replace a LCD panal 2 5 2 5 Check the output of Q6 or pin 3 of CN2 Trouble in Q6 or pin 3 of com ...

Page 20: ...signal of Scalier No Yes Is the input signal normal Check the video signal cable or R G B con ass y Trouble in the soldering of R G B data lines from output of ADC to pin 41 wafer Yes No Yes Are the R G B Digital values every eight bits correct on ADC output stage Check the ambient circuit of ADC ...

Page 21: ...only white No Yes Next page No Yes Is pin 41 cable of CN6 well connected Connection trouble Check the output of scalier pin 70 99 100 101 and soldering of CN6 No Yes Is pin 1 of Q16 3 3V Check Q16 its ambient circuit and pin 26 of com ...

Page 22: ...age Yes No Yes Is the output of ADC correct No Yes Is the input of ADC correct Check the video input signal Replace the main board or replace ADC Yes Check the LCD panel or pin 41 wafer and con ass y No Yes Is the output of Scalier correct No Yes Is the input of Scalier correct Replace the main board or replace ADC 5 1 No Video ...

Page 23: ...ock of SDRAM pin 35 correct No No Yes Yes Is 3 3V plugged in VCC pin of SDRAM Check Scalier pin 135 Check 3 3V line After checking the soldering between SDRAM and Scalier if O K replace the SDRAM 6 Broke graph ...

Page 24: ...V DC AC Inverter Panel S G Driver Back light panel From PC H V sync RGB signal RED 8 Green 8 Blue 8 I2C address data line EEPROM 24C08 Data line Address line contorl line Dot clk Red 6 Green 6 Blue 6 Hs Vs DE LCLK 630VAC 62khz Hs Vs Hsync Vsync clk Offset Corse Clock timing phase Current resistance 3 3V 5V 12V Main Borad TDA8752 Mx88LC284FC 12V On Off DDC I2C 12V Dimming Control Board L500B1 BLOCK...

Page 25: ...23 Main PCB Component Side PCB LAYOUT ...

Page 26: ...Main PCB Solder Side 24 ...

Page 27: ...25 Control PCB Component Side Control PCB Solder Side ...

Page 28: ...26 D sub PCB Component Side D sub PCB Solder Side ...

Page 29: ...27 SCHEMATIC DIAGRAM ...

Page 30: ...EXPLODED VIEW MECHANICAL PARTS LIST 28 ...

Page 31: ... Cera 50V J Tolerance C 0 25pF D 0 5 F 1pF J 5 K 10 P 100 0 Z 80 Fig Part No Description Index R101 Resistors RD 4Z820J Carbon 82J R30 HRFS472JBA Chip 4 7K OHM J Tolerance F 1 J 5 K 10 M 20 G 2 Important Safety Notice Components identified with the International Symbol have special characteristics important for safety When replacing any components use only manufacturer s specified parts Abbreviati...

Page 32: ... 0 1MF Z 1608 ELECTRICAL PARTS LIST 30 The components identified by mark have special characteristics important for safety and x ray radiation These should be replaced only with the types specified in the parts list LOC PART CODE PART NAME PART DESC C28 HCFK104ZBA C CHIP CERA 50V Y5V 0 1MF Z 1608 C29 HCFK104ZBA C CHIP CERA 50V Y5V 0 1MF Z 1608 C3 HCFK104ZBA C CHIP CERA 50V Y5V 0 1MF Z 1608 C31 HCF...

Page 33: ... 06 ANGLE D2 DRLS4148 DIODE CHIP RLS4148 D3 DRLS4148 DIODE CHIP RLS4148 D4 DRLS4148 DIODE CHIP RLS4148 D5 DRLS4148 DIODE CHIP RLS4148 EF1 5PF1BH471M FILTER LC CFI 06 B 1H 471M INV1 DBA11502 LCD INVERTER BAI 1502 LOC PART CODE PART NAME PART DESC L1 HFFTB2601B COIL CHIP BEAD TB321611Z260 L10 HFFTB2601B COIL CHIP BEAD TB321611Z260 L11 HFFTB2601B COIL CHIP BEAD TB321611Z260 L12 HFFTB2601B COIL CHIP B...

Page 34: ... R9 HRFS101JBA R CHIP 1 16 100 OHM J 1608 RP1 HFFH4H300E COIL CHIP BEAD HB 4H3216 300JT RP10 HFFH4M121E COIL CHIP BEAD HB 4M3216 121JT RP11 HFFH4M121E COIL CHIP BEAD HB 4M3216 121JT RP2 HFFH4H300E COIL CHIP BEAD HB 4H3216 300JT RP3 HFFH4H300E COIL CHIP BEAD HB 4H3216 300JT RP4 HFFH4H300E COIL CHIP BEAD HB 4H3216 300JT RP5 HFFH4H300E COIL CHIP BEAD HB 4H3216 300JT RP6 HFFH4M121E COIL CHIP BEAD HB 4...

Page 35: ...284 U2 1TDA8752BH IC ADC TDA8752BH U3 1MTV212M IC MICOM MTV212MS64U LOC PART CODE PART NAME PART DESC U3A 9979300501 SOCKET IC SDIF 42T 1 778 U4 1EM636165T IC SDRAM EM636165TS 8 U5 1EM636165T IC SDRAM EM636165TS 8 U6 124C08 IC EEPROM 24C08 U7 1KA7542 ICVOTAGEDETECTOR KA7542 U8 1TC74ACT14 IC TC74ACT14FN U9 1LM385M25 ICVOLTAGEREFERENCE LM385M25 Y1 5XJ14R318F CRYSTAL QUARTZ HC 49 S 14 31818MHZ 50PPM ...

Page 36: ...DAEWOO ELECTRONICS CO LTD 686 AHYEON DONG MAPO GU SEOUL KOREA C P O BOX 8003 SEOUL KOREA TELEX DWELEC K28177 8 CABLE DAEWOOELEC E mail G7F00E web dwe co kr TEL 82 32 510 7620 FAX 82 32 510 7630 ...

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