Daewoo 719BF Service Manual Page 1

DAEWOO ELECTRONICS CO., LTD.http : //svc.dwe.co.krService ManualFebruary, 2001XGA COLOR MONITORModel : 719B 719BF

Pin Signal1 Red2 Green3 Blue4 GND5 GND6 GND - Red7 GND - Green8 GND - Blue9 +5Vdc10 GND - H.Sync11 GND - V.Sync12 Bi-directional Data (SDA)13 Horizont

9OPERATION AND ADJUSTMENT719B Control Panel• Move cursor to the right window on the OSD window.• Increase the value of any selected function.• Move cu

10719BF Control Panel• Move cursor to the right window on the OSD window.• Increase the value of any selected function.• Move cursor to the left windo

11719B Key Process•When you choose the icon on the OSD window, you can exit the OSD screen. Hot KeyBRIGHTNESS

12719BF Key Process•When you choose the icon on the OSD window, you can exit the OSD screen. Hot KeyBRIGHTNESS

13OSD FunctionsAdjust the parallelogram when the screen is leaning left or right.PARALLELOGRAMAdjust the trapezoid of the screen by moving the lines i

14Select language for OSD (5 languages).LANGUAGEICON CONTROL FUNCTIONSReset the screen to the Fa

◆ Standard Adjustment Conditions1. Power source voltage : AC 120V, 60Hz/AC 220V, 50Hz.2. Aging : Take at least 20 minutes warm-up time.3. Signals.Vid

16(h) Select the R, G, B gain on the OSD menu and adjust the / key to get the color coordinates inX=0.281±0.02, Y=0.311±0.02.(i) Adjust the

17TROUBLESHOOTING HINTS1. No CharacterAre theContrast &Brightness ControlsmaximumChange the Contrast &Brightness control tomaximumNo RasterRef

SAFETY PRECAUTIONS 1GENERAL SAFETY INFORMATION 2SERVICING PRECAUTIONS 3TECHNICAL INFORMATION 6GENERAL INFORMATION 7PIN CONNECTOR 8CAUTIONS FOR ADJUSTM

182. No RasterTrouble inpower supplycircuitTrouble in powersupply circuitTrouble in G1line of Main PWBTrouble in FBT or peripheral circuitHigh Voltage

193. A Missing ColorIs input signalnormal?One color ismissingCRTCathode (Rk, Gk, Bk)is normal?Is videooutput IC(IC802, TDA9536)normal?Each grid (G1, G

204. Abnormal OSD FontIs menukey selected?Is OSD Fontexist?* If menu key selected.Is +5VVoltage about 5V?Abnormal OSD FontIs theoutput of IC803(pin 13

215. Horizontal Output CircuitIs theB+line voltageover 45V?Is the H-outwaveform of IC501normal?Trouble in B+ Booster Circuit(Check the B+section of IC

226. Unstable Picture6-1. HorizontalUnstablepictureIs H.Syncinput pin of IC501correct?Check H.Sync Out ofMicom or its ambientcircuits.Is the pin 10 of

236-2. VerticalUnstable orAbnormal pictureIs 13V DC linecorrect?Check PWR 13V ambient circuit.NoYesIsthe outputwaveform of IC401(pin 6) normal?Tro

247. FocusMonitor remainsunfocusedCheckFocus VR in FBTIsfocusacceptable?Trouble in Focuscircuit (FBT)YesOKNo

257-1. Dynamic FocusFocus is poorIs thewaveform of theDF pin in FBTcorrect?ORION : 300V 120VSAMSUNG : 300V 120V1. Check the CRT socket or

268. ConvergenceIsconvergenceon the center areabad?Isconvergence on thefringe area bad?Adjust staticconvergenceRefer toAdjustmentprocedure ofconvergen

279. Abnormal Picture9-1. Horizontal SizeWhenthe H.Size on the OSD is changed, is theH.size changed?NoYesCheck pin 11 of IC501and its ambient circuitI

1SAFETY PRECAUTIONS◆ Safety CheckCare should be taken while servicing this analog color display because of the high voltages used in thedeflection cir

289-2. Vertical SizeIschangeable theDC voltage ofIC401 pin 6?Check the IC401and itsambient circuit Check the pin 23 of IC501 and its ambient

2910. High Voltage Output CircuitTrouble in FBTIs Q505 collector waveformnormal?YesYesNoTrouble in IC501ambient circuitIs IC501pin 8normal?YesNoTroubl

3011. Side-Pincushion CircuitSide-Pincusion distortionis excessive or barrelO.KSelect theside-pincushionicon on OSD menu,and adjust acceptableposition

3112. Power Supply Unit (P.S.U)Trouble in P.S.UIspower switchon?Switch onNoYesYesIsfuse F001O.K?Check the power cord outletand diode D001, D002,D003,

32Is voltageof C10627Vdc?Trouble in D108NoIs voltageof C109 13Vdc?NoYesYesYesIs voltage of C108 -13Vdc?Trouble in D104 or vertical part

33BLOCK DIAGRAMCRTSOCKETCRT : Orion Mini -Neck 15"D -SUBRGB H/VVideo Pre- amp (65M Hz)TDA9210 (SGS Thompson)OSDNT6828(Novatek)CRTDriverTDA9536(SG

PCB LAYOUT34719B/719BF Main PCB Component Side

35719B/719BF Main PCB Solder Side

36719B/719BF CRT PCB Solder Side719B/719BF CRT PCB Component Side

37719BF Control PCB Solder Side719BF Control PCB Component Side

2GENERAL SAFETY INFORMATIONWarning: This product includes critical mechanical and electrical parts which are essential for x rayprotection. For contin

38Power & Connection SectionSCHEMATIC DIAGRAM

39Control & Vert. out Section

40Horizontal Section

41Video Section

42EXPLODED VIEW & MECHANICAL PARTS LIST719B719B

719B719BF43

C210 CCXB1H181K C CERA 50V B 180PF K (TAPPING)C211 CCXB1H181K C CERA 50V B 180PF K (TAPPING)C212 CCXF1H104Z C CERA 50V F 0.1MF ZC213 CCXF1H104Z C CERA

46C546 CMXM2A682J C MYLAR 100V 6800PF J (TP)C548 CCXF1H104Z C CERA 50V F 0.1MF ZC549 CMXM2A152J C MYLAR 100V 1500PF J (TP)C550 CCXF1H104Z C CERA 50V F

47D514 DRGP10D--- DIODE RGP 10-D (TAPPING)D515 DZN4148--- DIODE 1N4148 AUTO 52MMD517 DZN4148--- DIODE 1N4148 AUTO 52MMD518 RD-AZ331J- R CARBON FILM 1/

48R001 RC-2Z684J- R CARBON COMP 1/2 680K OHM JR003 RS01Z513JS R M-OXIDE FILM 1W 51K OHM J SMALLR004 RS01Z513JS R M-OXIDE FILM 1W 51K OHM J SMALLR005 R

3SERVICING PRECAUTIONS◆ General Servicing Precautions1. Always unplug the AC power cord from the AC power source before:a. Removing or reinstalling an

49R521 RD-AZ471J- R CARBON FILM 1/6 470 OHM JR522 RD-AZ122J- R CARBON FILM 1/6 1.2K OHM JR523 RD-2Z221J- R CARBON FILM 1/2 220 OHM JR524 RS02Z680JS R

50R862 RD-AZ330J- R CARBON FILM 1/6 33 OHM JR863 RD-AZ360J- R CARBON FILM 1/6 36 OHM JR864 RD-4Z201J- R CARBON FILM 1/4 200 OHM JR865 RD-4Z121J- R CAR

DAEWOO ELECTRONICS CO., LTD686, AHYEON-DONG MAPO-GUSEOUL, KOREAC.P.O. BOX 8003 SEOUL, KOREATELEX : DWELEC K28177-8CABLE : "DAEWOOELEC"E-mail

4◆ Electrostatically Sensitive (ES) DevicesSome semiconductor (solid state) devices can be damaged easily by static electricity.Such components are

5FIGURE 1. USE SOLDERING IRON TO PRY LEADS◆ IC Removal/ReplacementSome utilized chassis circuit boards have slotted (oblong) holes through which the

6◆ Power IC, Transistor or Devices Removal/Replacement1. Heat and remove all solders from the device leads.2. Remove the heatsink mounting screw (if

ADJ AdjustmentAFC Automatic Frequency ControlCRT Cathode Ray TubeDef DeflectionD.Y Deflection YokeFBT Flyback TransformerH.SYNC Horizontal Synchroniza