6-2. V.OSC/Deflection Circuit | Daewoo 710B specs

6-2. V.OSC/Deflection Circuit

6-2. V.OSC/Deflection Circuit

Unstable or

Abnormal picture

				Is			No
				± 13V DC line			No
				± 13V DC line
				correct?
					Yes
					Yes

				Is
				Is
45Vp-p				the output			Yes
				waveform of IC401			Yes
				(pin 6) normal?
					No



				Is the			Yes
				output pulse			Yes
				of IC501 (pin 23)
				normal?
					No
					No


				Trouble in V.Sync line
				or IC501 failure.

Trouble in

power supply unit

V.DY

failure

Trouble in IC401 or its ambient circuit

21

Image 23

Daewoo 710B service manual 6-2. V.OSC/Deflection Circuit, Unstable or Abnormal picture

Contents

XGA COLOR MONITOR Model 710B Service Manual CONTENTS Implosion Protection SAFETY PRECAUTIONSSafety Check Fire & Shock Hazard Terms in the manual GENERAL SAFETY INFORMATIONSymbols in the manual Symbols as marked on equipment General Servicing Precautions SERVICING PRECAUTIONS General Soldering Guidelines Electrostatically Sensitive ES Devices Removal IC Removal/ReplacementReplacement “Small-Signal” Discrete Transistor Removal/Replacement TECHNICAL INFORMATION Power IC, Transistor or Devices Removal/ReplacementDiode Removal/Replacement Abbreviations GENERAL INFORMATION Caution For Servicing PIN CONNECTORCAUTIONS FOR ADJUSTMENT AND REPAIR ADJUSTMENT KEY OPERATION & ADJUSTMENT BRIGHTNESS ADJUSTMENT PROCESSRECALL CONTRAST OSDOn-Screen Display Menu ROTATION Choose different preset color temperatures or set your own customized Self Diagnosis No Character TROUBLESHOOTING HINTS1. No Character No Raster 2. No Raster One color is missing 3. A missing Color Abnormal OSD Font 4. Abnormal OSD Font Trouble in Horizontal output circuit No Raster 5. Horizontal Output Circuit correct? Unstable pictureIs H.Sync input pin of IC501 Unstable or Abnormal picture 6-2. V.OSC/Deflection Circuit Monitor remains unfocused 7. Focus Focus is poor 7-1. Dynamic Focus Poor convergence 8. Convergence 1.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 Size Trouble in H.V circuit No Raster 10. High Voltage Circuit Side-Pincusion distortion is excessive or barrel 11. Side-Pincushion Circuit Trouble in P.S.U 12. Power Supply Unit P.S.U 8.7V DC? of C104 13V DC?13V DC? Main Adjustment ALIGNMENT PROCEDUREStandard Adjustment Conditions Pre-Adjustment l Repeat e,f,g,h,i,j DIAGRAM Main PCB Component Side PCB LAYOUT Main PCB Solder Side Video PCB Component Side Video PCB Solder Side Page EXPLODED VIEW DIAGRAM Abbreviation of Description REPLACEMENT PARTS LISTImportant Safety Notice PART-DESC CIRCUIT BOARD ELECTRICAL PARTS LISTPART-CODE PART-NAME PART-DESC PART-CODEPART-NAME PART-DESC PART-CODEPART-NAME PART-DESC PART-CODEPART-NAME PART-DESC PART-CODEPART-NAME PART-DESC PART-CODEPART-NAME PART-DESC PART-CODEPART-NAME PART-DESC PART-CODEPART-NAME PART-DESC PART-CODEPART-NAME PART-DESC PART-CODEPART-NAME PART-DESC PART-CODEPART-NAME PART-DESC PART-CODEPART-NAME PART-DESC PART-NAME PART-DESC PART-CODEPART-NAME PART-DESC PART-CODEPART-NAME PART-DESC DAEWOO ELECTRONICS CO OVERSEAS SERVICE DEPTServ ce Manual PRINTED DATE NOV.1998