Daewoo 710B service manual No Raster

Page 18

2. No Raster

2. No Raster

No Raster

Is CRT	No
heater red-hot?

Yes

Turn the Brightness

&Contrast control to set Maximum

		Yes
	Is whole		No
	screen bright?
	screen bright?
		Yes
		Yes
	Check		No
	G1 voltage about		No
	G1 voltage about
	-40V?
		Yes
		Yes

Is CRT

G2 (screen) voltage No about 500V?

	Yes
Is 80V DC		No
line normal?

Yes

Does

turning the Brightness No control counterclockwise

make screen

bright?

Yes

Trouble in FBT

Is Heater

Voltage (CRT PWB)

about 6V?

Yes

Trouble in power supply circuit

Trouble in power supply circuit

Trouble in G1 line of Main PWB

Trouble in FBT

Trouble in 80/ 120V DC line of power supply unit

High Voltage trouble in FBT

No		Trouble in
		CRT

Refer to trouble in power supply unit.

Refer to trouble in P,S,U

16

Image 18

Contents Service Manual XGA COLOR MONITOR Model 710BCONTENTS Fire & Shock Hazard SAFETY PRECAUTIONSSafety Check Implosion ProtectionSymbols as marked on equipment GENERAL SAFETY INFORMATIONSymbols in the manual Terms in the manualSERVICING PRECAUTIONS General Servicing PrecautionsElectrostatically Sensitive ES Devices General Soldering Guidelines“Small-Signal” Discrete Transistor Removal/Replacement IC Removal/ReplacementReplacement RemovalPower IC, Transistor or Devices Removal/Replacement Diode Removal/ReplacementTECHNICAL INFORMATION GENERAL INFORMATION AbbreviationsPIN CONNECTOR CAUTIONS FOR ADJUSTMENT AND REPAIRCaution For Servicing OPERATION & ADJUSTMENT ADJUSTMENT KEYCONTRAST ADJUSTMENT PROCESSRECALL BRIGHTNESSOSDOn-Screen Display Menu ROTATION Choose different preset color temperatures or set your own customized Self Diagnosis TROUBLESHOOTING HINTS 1. No CharacterNo Character 2. No Raster No Raster3. A missing Color One color is missing4. Abnormal OSD Font Abnormal OSD Font5. Horizontal Output Circuit Trouble in Horizontal output circuit No Rasterinput pin of IC501 Unstable pictureIs H.Sync correct?6-2. V.OSC/Deflection Circuit Unstable or Abnormal picture7. Focus Monitor remains unfocused7-1. Dynamic Focus Focus is poor8. Convergence Poor convergencechanged, is the H.size changed? 9. Abnormal Picture 9-1. Horizontal SizeAbnormal H.Size 1.Check B+ section of TDA9109 and its ambient circuit9-2. Vertical Size Abnormal V.Size10. High Voltage Circuit Trouble in H.V circuit No Raster11. Side-Pincushion Circuit Side-Pincusion distortion is excessive or barrel12. Power Supply Unit P.S.U Trouble in P.S.Uof C104 13V DC? 13V DC?8.7V DC? Pre-Adjustment ALIGNMENT PROCEDUREStandard Adjustment Conditions Main Adjustmentl Repeat e,f,g,h,i,j DIAGRAM PCB LAYOUT Main PCB Component SideMain PCB Solder Side Video PCB Component Side Video PCB Solder Side Page EXPLODED VIEW DIAGRAM REPLACEMENT PARTS LIST Important Safety NoticeAbbreviation of Description PART-NAME CIRCUIT BOARD ELECTRICAL PARTS LISTPART-CODE 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 PRINTED DATE NOV.1998 OVERSEAS SERVICE DEPTServ ce Manual DAEWOO ELECTRONICS CO