Daewoo CML-523BM Manual de servicio

DAEWOO ELECTRONICS CO., LTD.http : //svc.dwe.co.krService ManualXGA COLOR MONITORModel : L500B1November, 2000

PIN CONNECTORCAUTIONS FOR ADJUSTMENT AND REPAIR• Degaussing is always required when adjusting purity or convergence.• The white balance adjustment has

OPERATION & ADJUSTMENT9Control PanelHot KeyEXITAUTO MENUBRIGHTNESS• The AUTO button launches the AUTO TRACKING function directly.• The EXIT button

10Key ProcessOSD OFFMENUEXITEXITMENUEXITMENU

11Adjustment ProcedureIs the mode1024x768?Adjust the FITSCREEN.Adjust the CLOCKcontrol.Perform the AUTOPOSITION.Is the H.Sizeproper?Is thenoise displa

12Display horizontal & vertical frequency and polarity.STATUSReset the screen to the Factory Preset Display Settings.RECALLAUTO POSITIONChoose aut

13Self DiagnosisWhen the monitor doesn’t display, if you press any key, Self Diagnosis screen is displayed. Self Diagnosisfunction checks if the sta

Standard Check point1. Power source : 100 - 240Vac, 50/60Hz.2. Aging : Take at least 20 minutes warm-up time.3. SignalVideo input : Analog 0.7Vpp 75Ω

15TROUBLESHOOTING HINTS1. Abnormal mode detectIs a inputH-sync of ADC correct?Abnormal modedetectNoNoYesYesIs waveform of pin 84 of ADC correct?Troubl

162. Trouble in Power onNoNoYesYesIs 5VS line normal?Trouble in U3 & Q1and its ambient circuit.Trouble in SQ1 and its ambient circuit. Check on U1

173. No RasterIs 12Vplugged in pin 1 of CN2?NoNoYesYesIs the output ofinverter correct?Check 12Vline of CN3.Replace the inverter.Replace a LCD panal.&

CONTENTSSAFETY PRECAUTIONS 1GENERAL SAFETY INFORMATION 2SERVICING PRECAUTIONS 3TECHNICAL INFORMATION 6GENERAL INFORMATION 7PIN CONNECTOR 8CAUTIONS FOR

184. One color is missingIs the OSD colornormal?One color is missingNoYesCheck the outputsignal of Scalier.NoYesIs the inputsignal normal?Check the vi

195. No VideoHas display imageonly white?NoYesNext page.NoYesIs pin 41cable of CN6well connected?Connection trouble. Check the output of scalier(pin 7

20Is OSD normal?BlackNoNoYesYesIs the contrastat its maximum?(3) No rasteror Check SDRAM.Set the contrast up to Max.Next Page.YesNoYesIs the output of

21Is clockof SDRAM pin 35correct?NoNoYesYesIs 3.3V plugged inVCC pin of SDRAM?Check Scalierpin 135.Check 3.3V line.After checking thesoldering between

22BLOCK DIAGRAM15pin DSUB -ConnectorBuffer74ACT14PRE-AMPControllerADCPLLScalingMIUOSD MuxDitheringCPU I/FOdd/EvenMUXSDRAM (16Mbit*2)MicomDC-DC convert

23Main PCB Component SidePCB LAYOUT

Main PCB Solder Side24

25Control PCB Component Side Control PCB Solder Side

26D-sub PCB Component SideD-sub PCB Solder Side

27SCHEMATIC DIAGRAM

SAFETY PRECAUTIONS1◆ Safety CheckCare should be taken while servicing this analog color display because of the high voltages used in thedeflection cir

EXPLODED VIEW & MECHANICAL PARTS LIST28

INFORMATION OF PART DESCRIPTION29RESISTOR DescriptionExample:CAPACITOR DescriptionExample:Fig &Part No DescriptionIndexCapacitorsC28 HCFK104Z

00030 9970800035 CABLE SIGNAL AS 15P+15P/DDC=1.5M(GY275A)00040 W1112B831- CORD POWER CML-100 1.8M BK(AME)01000 9979800550 PCB CONTROL T=1.6*246*122AD1

31C71 HCBK103KBA C CHIP CERA 50V X7R 0.01MF K 1608C72 HCBK223KBA C CHIP CERA 50V X7R 0.022MF K 1608C73 HCBK103KBA C CHIP CERA 50V X7R 0.01MF K 1608C74

32R28 HRFS105JBA R CHIP 1/16 1M OHM J 1608R29 HRFS472JBA R CHIP 1/16 4.7K OHM J 1608R3 HRFS000JBA R CHIP 1/16 0 OHM J 1608R30 HRFS472JBA R CHIP 1/1

33SU1 1LM2596S33 IC SD REGULATOR LM2596S3.3SW1 5S50101Z10 SW TACT KPT-1115AMSW2 5S50101Z10 SW TACT KPT-1115AMSW3 5S50101Z10 SW TACT KPT-1115AMSW4 5S50

DAEWOO ELECTRONICS CO., LTD686, AHYEON-DONG MAPO-GUSEOUL, KOREAC.P.O. BOX 8003 SEOUL, KOREATELEX : DWELEC K28177-8CABLE : "DAEWOOELEC"E-mail

GENERAL SAFETY INFORMATION2Warning: This product includes critical mechanical and electrical parts which are essential for x rayprotection. For contin

SERVICING PRECAUTIONS3◆ General Servicing Precautions1. Always unplug the AC power cord from the AC power source before:a. Removing or reinstalling an

4◆ Electrostatically Sensitive (ES) DevicesSome semiconductor (solid state) devices can be damaged easily by static electricity.Such components are

5FIGURE 1. USE SOLDERING IRON TO PRY LEADS◆ IC Removal/ReplacementSome utilized chassis circuit boards have slotted (oblong) holes through which the

6◆ Diode Removal/Replacement1. Remove defective diode by clipping its leads as close as possible to diode body.2. Bend the two remaining leads perpen

GENERAL INFORMATION7This TFT LCD monitor automatically scans all horizontal frequencies from 30KHz to 62KHz, and allvertical frequencies from 50Hz to