Daewoo 710B service manual Power Supply Unit P.S.U, Trouble in P.S.U

Page 31
12. Power Supply Unit (P.S.U)

12. Power Supply Unit (P.S.U)

Trouble in P.S.U

 

 

 

 

 

 

 

Is

No

power switch

 

 

on?

 

 

 

Yes

 

 

 

 

Is

No

fuse F001

 

 

O.K?

 

 

 

Yes

 

 

 

 

Is the

No

voltage of IC001

 

 

pin 3 16V?

 

 

 

Yes

 

 

 

 

Is

No

voltage of T001

pin 6 130V

 

(370V)?

 

 

 

Yes

 

 

 

 

Is the

No

waveform of IC001

 

 

pin 1correct?

 

400Vpp (620Vpp)

 

Yes

 

 

 

 

 

 

Is

No

voltage of C103

 

 

45V DC?

 

 

 

Yes

 

 

 

 

Is

No

voltage of C101

 

 

80V DC?

 

 

 

Yes

 

 

 

 

 

 

 

Is

No

voltage of C113

 

 

120V DC?

 

 

 

 

 

 

 

A

 

Switch on

Check the power cord outlet and diode D001, D002, D003, D004

Replace R004

Replace C005

Trouble in D001, D002,

D003, D004, C004 and

TH001.

Trouble in T001, IC001, IC101, PH001 and D005 etc.

Trouble in D102, D103 or B+ Part

Trouble in D101 or

Video Part

Trouble in D108 or

Video Part

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Contents XGA COLOR MONITOR Model 710B Service ManualCONTENTS Implosion Protection SAFETY PRECAUTIONSSafety Check Fire & Shock HazardTerms in the manual GENERAL SAFETY INFORMATIONSymbols in the manual Symbols as marked on equipmentGeneral Servicing Precautions SERVICING PRECAUTIONSGeneral Soldering Guidelines Electrostatically Sensitive ES DevicesRemoval IC Removal/ReplacementReplacement “Small-Signal” Discrete Transistor Removal/ReplacementDiode Removal/Replacement Power IC, Transistor or Devices Removal/ReplacementTECHNICAL INFORMATION Abbreviations GENERAL INFORMATIONCAUTIONS FOR ADJUSTMENT AND REPAIR PIN CONNECTORCaution For Servicing ADJUSTMENT KEY OPERATION & ADJUSTMENTBRIGHTNESS ADJUSTMENT PROCESSRECALL CONTRASTOSDOn-Screen Display Menu ROTATION Choose different preset color temperatures or set your own customized Self Diagnosis 1. No Character TROUBLESHOOTING HINTSNo Character No Raster 2. No RasterOne color is missing 3. A missing ColorAbnormal OSD Font 4. Abnormal OSD FontTrouble in Horizontal output circuit No Raster 5. Horizontal Output Circuitcorrect? Unstable pictureIs H.Sync input pin of IC501Unstable or Abnormal picture 6-2. V.OSC/Deflection CircuitMonitor remains unfocused 7. FocusFocus is poor 7-1. Dynamic FocusPoor convergence 8. Convergence1.Check B+ section of TDA9109 and its ambient circuit 9. Abnormal Picture 9-1. Horizontal SizeAbnormal H.Size changed, is the H.size changed?Abnormal V.Size 9-2. Vertical SizeTrouble in H.V circuit No Raster 10. High Voltage CircuitSide-Pincusion distortion is excessive or barrel 11. Side-Pincushion CircuitTrouble in P.S.U 12. Power Supply Unit P.S.U13V DC? of C104 13V DC?8.7V DC? Main Adjustment ALIGNMENT PROCEDUREStandard Adjustment Conditions Pre-Adjustmentl Repeat e,f,g,h,i,j DIAGRAM Main PCB Component Side PCB LAYOUTMain PCB Solder Side Video PCB Component Side Video PCB Solder Side Page EXPLODED VIEW DIAGRAM Important Safety Notice REPLACEMENT PARTS LISTAbbreviation of Description PART-DESC CIRCUIT BOARD ELECTRICAL PARTS LISTPART-CODE PART-NAMEPART-NAME PART-CODEPART-DESC PART-NAME PART-CODEPART-DESC PART-NAME PART-CODEPART-DESC PART-NAME PART-CODEPART-DESC PART-NAME PART-CODEPART-DESC PART-NAME PART-CODEPART-DESC PART-NAME PART-CODEPART-DESC PART-NAME PART-CODEPART-DESC PART-NAME PART-CODEPART-DESC PART-NAME PART-CODEPART-DESC PART-NAME PART-CODEPART-DESC PART-NAME PART-NAME PART-NAME PART-CODEPART-DESC PART-NAME PART-CODEPART-DESC PART-NAME DAEWOO ELECTRONICS CO OVERSEAS SERVICE DEPTServ ce Manual PRINTED DATE NOV.1998
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