Daewoo 710B service manual Focus, Monitor remains unfocused

Page 24

7. Focus

7. Focus

Monitor remains

unfocused

Check

Focus VR in

FBT

Is

focusYes OK acceptable?

No

Trouble in Focus

circuit (FBT)

22

Image 24

Contents Service Manual XGA COLOR MONITOR Model 710BCONTENTS SAFETY PRECAUTIONS Safety CheckFire & Shock Hazard Implosion ProtectionGENERAL SAFETY INFORMATION Symbols in the manualSymbols as marked on equipment Terms in the manualSERVICING PRECAUTIONS General Servicing PrecautionsElectrostatically Sensitive ES Devices General Soldering GuidelinesIC Removal/Replacement Replacement“Small-Signal” Discrete Transistor Removal/Replacement 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 KEYADJUSTMENT PROCESS RECALLCONTRAST 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 RasterUnstable picture Is H.Syncinput pin of IC501 correct?6-2. V.OSC/Deflection Circuit Unstable or Abnormal picture7. Focus Monitor remains unfocused7-1. Dynamic Focus Focus is poor8. Convergence Poor convergence9. Abnormal Picture 9-1. Horizontal Size Abnormal H.Sizechanged, is the H.size changed? 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? ALIGNMENT PROCEDURE Standard Adjustment ConditionsPre-Adjustment 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 CIRCUIT BOARD ELECTRICAL PARTS LIST PART-CODEPART-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 OVERSEAS SERVICE DEPT Serv ce ManualPRINTED DATE NOV.1998 DAEWOO ELECTRONICS CO