Daewoo 710B Horizontal Output Circuit, Trouble in Horizontal output circuit No Raster

Page 21

5. Horizontal Output Circuit

5. Horizontal Output Circuit

Trouble in Horizontal

output circuit

(No Raster

11V

0V

	Is the		No
	B+line voltage		No


	over 45V?
		Yes
		Yes

	Is the H-out		No
	waveform of IC501		No


	normal?
		Yes
		Yes

Trouble in B+ Booster Circuit (Check the B+section of IC501, Check Q603 and its ambient circuit).

Trouble in IC501

10V

0V

	Is the Collector		No
	wave form of		No		Trouble in Q501, Q502


	Q501 or Q502
	Q501 or Q502
	normal?
		Yes
		Yes

66V

	Is the Collector			No
	waveform of			No
	waveform of
	Q503 normal?
		Yes
		Yes

	Trouble in Q504 and
	its ambient circuit.

Trouble in Q503 and its ambient circuit.

19

Image 21

Contents XGA COLOR MONITOR Model 710B Service ManualCONTENTS Safety Check SAFETY PRECAUTIONSFire & Shock Hazard Implosion ProtectionSymbols in the manual GENERAL SAFETY INFORMATIONSymbols as marked on equipment Terms in the manualGeneral Servicing Precautions SERVICING PRECAUTIONSGeneral Soldering Guidelines Electrostatically Sensitive ES DevicesReplacement IC Removal/Replacement“Small-Signal” Discrete Transistor Removal/Replacement RemovalPower IC, Transistor or Devices Removal/Replacement Diode Removal/ReplacementTECHNICAL INFORMATION Abbreviations GENERAL INFORMATIONPIN CONNECTOR CAUTIONS FOR ADJUSTMENT AND REPAIRCaution For Servicing ADJUSTMENT KEY OPERATION & ADJUSTMENTRECALL ADJUSTMENT PROCESSCONTRAST BRIGHTNESSOSDOn-Screen Display Menu ROTATION Choose different preset color temperatures or set your own customized Self Diagnosis TROUBLESHOOTING HINTS 1. No CharacterNo 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 CircuitIs H.Sync Unstable pictureinput pin of IC501 correct?Unstable or Abnormal picture 6-2. V.OSC/Deflection CircuitMonitor remains unfocused 7. FocusFocus is poor 7-1. Dynamic FocusPoor convergence 8. ConvergenceAbnormal H.Size 9. Abnormal Picture 9-1. Horizontal Sizechanged, is the H.size changed? 1.Check B+ section of TDA9109 and its ambient circuitAbnormal 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.Uof C104 13V DC? 13V DC?8.7V DC? Standard Adjustment Conditions ALIGNMENT PROCEDUREPre-Adjustment Main 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 REPLACEMENT PARTS LIST Important Safety NoticeAbbreviation of Description PART-CODE CIRCUIT BOARD ELECTRICAL PARTS LISTPART-NAME PART-DESCPART-CODE PART-NAMEPART-DESC PART-CODE PART-NAMEPART-DESC PART-CODE PART-NAMEPART-DESC PART-CODE PART-NAMEPART-DESC PART-CODE PART-NAMEPART-DESC PART-CODE PART-NAMEPART-DESC PART-CODE PART-NAMEPART-DESC PART-CODE PART-NAMEPART-DESC PART-CODE PART-NAMEPART-DESC PART-CODE PART-NAMEPART-DESC PART-CODE PART-NAMEPART-DESC PART-CODE PART-NAME PART-CODE PART-NAMEPART-DESC PART-CODE PART-NAMEPART-DESC PART-CODE Serv ce Manual OVERSEAS SERVICE DEPTPRINTED DATE NOV.1998 DAEWOO ELECTRONICS CO