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DAEWOO ELECTRONICS 719B Service Manual Download Page 19

17

TROUBLESHOOTING HINTS

1. No Character

Are the

Contrast &

Brightness Controls

maximum

Change the Contrast &
Brightness control to
maximum

No Raster

Refer to
No Raster

Check the peripheral circuit
of CRT Board

Check the video output
(IC802, TDA9536) and
their ambient circuit

Trouble in 6.3Vdc line
of the Main PWB

Check the blanking pulse 
circuit

Check the signal cable

No Character

Is whole

screen bright?

Yes

Yes

Yes

Yes

Yes

No

No

No

No

No

Yes

Yes

Rk, Gk, Bk

About 40Vpp

No

No

Is CRT

Cathode (Rk, Gk, Bk)

signal level

normal?

Is the

output signal of the

(pin 16,18,20) pre-amp

(IC801, TDA9210)

normal?

Is blanking

pulse (pin 20 of IC801)

normal?

Is 6.3Vdc line

normal?

Is input signal

normal?

Trouble in IC801 and

its ambient circuit

All manuals and user guides at all-guides.com

Summary of Contents for 719B

Page 1: ...DAEWOO ELECTRONICS CO LTD http svc dwe co kr Service Manual February 2001 XGA COLOR MONITOR Model 719B 719BF All manuals and user guides at all guides com a l l g u i d e s c o m ...

Page 2: ...NNECTOR 8 CAUTIONS FOR ADJUSTMENT AND REPAIR 8 OPERATION AND ADJUSTMENT 9 ALIGNMENT PROCEDURE 15 TROUBLESHOOTING HINTS 17 BLOCK DIAGRAM 33 PCB LAYOUT 34 SCHEMATIC DIAGRAM 38 EXPLODED VIEW MECHANICAL PARTS LIST 42 INFORMATION OF PART DESCRIPTION 44 ELECTRICAL PARTS LIST 45 CONTENTS All manuals and user guides at all guides com ...

Page 3: ...al parts should be replaced with manufacturer s specified parts to prevent X Ray shock fire or other hazards Do not modify the original design without getting written permission from DAEWOO ELECTRONICS CO or this will void the original parts and labor warranty CAUTION No modifications of any circuits should be attempted Service work should be performed only after you are thoroughly familiar with a...

Page 4: ...quipment or other property WARNING Statements identify conditions or practices that could result in personal injury or loss of life Terms as marked on equipment CAUTION Statements indicate a personal injury hazard not immediately accessible as one reads the marking or a hazard which is properly included on the equipment itself WARNING Statements are clearly concerning indicated personal injury haz...

Page 5: ...pipe cleaner cotton tipped stick or comparable nonabrasive applicator 10 by volume Aceton and 90 by volume isopropyl alchohol 90 99 strength 6 Do not damage any plug socket B voltage interlocks with which instruments covered by this service manual might be equipped 7 Do not apply AC power to this instrument and or any other of its electrical assemblies unless all the solid state device heat sinks ...

Page 6: ...uctive foam aluminum foil or comparable conductive material 7 Immediately before removing the protective material from the leads of replacement ES devices touch the protective material to the chassis or circuit assembly into which the device will be installed 8 Minimize bodily movements when handling unpackaged replacement ES devices Otherwise harmful motion such as the brushing together clothes f...

Page 7: ...type solder removal device or with desoldering braid before removing the IC Replacement 1 Carefully insert the replacement IC in the circuit board 2 Carefully bend each IC lead against the circuit foil pad and solder it 3 Clean the soldered areas with a small wire bristle brush lt is not necessary to reapply acrylic coating to the area Small Signal Discrete Transistor Removal Replacement 1 Remove ...

Page 8: ...ponding lead on the circuit board 4 Securely crimp each connection and solder it 5 Inspect the solder joints of the two original leads on the circuit board copper side If they are not shiny reheat them and apply additional solder if necessary TECHNICAL INFORMATION Model 719B 719BF CDT Size 17 inch 17 inch DynaFlat Diagonal visible image area 16 2 inch 16 01 inch Dot Pitch 0 28 mm 0 25 mm Synchroni...

Page 9: ... color monitor supports IBM PC PC XT PC AT personal System 2 PS 2 Apple Macintosh and compatible users crisp text and vivid color graphics display when using the following graphics adapters VGA 8514 A Super VGA VESA and XGA and Apple Macintosh Video Card And so this color monitor has a maximum horizontal resolution of 1280 dots and a maximum vertical resolution of 1024 lines for superior clarity o...

Page 10: ...ocedure described in the service manual is made by a visual check Allow 20 minutes warm up time for the display before checking or adjusting only electrical specification or function Reform the leadwire after any repair work Caution For Servicing In case of servicing or replacing CRT high voltage sometimes remains in the anode of the CRT Completely discharge high voltage before servicing or replac...

Page 11: ...eft window on the OSD window Decrease the value of any selected function Launch OSD On Screen Display MENU window Move cursor to the high window on the OSD window Increase the value of V size or V center Move cursor to the low window on the OSD window Decrease the value of V size or V center All manuals and user guides at all guides com a l l g u i d e s c o m ...

Page 12: ...eft window on the OSD window Decrease the value of any selected function Launch OSD On Screen Display MENU window Move cursor to the high window on the OSD window Increase the value of V size or V center Move cursor to the low window on the OSD window Decrease the value of V size or V center All manuals and user guides at all guides com ...

Page 13: ...11 719B Key Process When you choose the icon on the OSD window you can exit the OSD screen Hot Key BRIGHTNESS CONTRAST OSD OFF MENU MENU MENU MENU All manuals and user guides at all guides com ...

Page 14: ...12 719BF Key Process When you choose the icon on the OSD window you can exit the OSD screen Hot Key BRIGHTNESS CONTRAST OSD OFF All manuals and user guides at all guides com ...

Page 15: ...f the display horizontally left or right and vertically up or down H CENTER V CENTER Choose different preset color temperatures or set your own customized color parameters Adjust the red gain Adjust the green gain Adjust the blue gain COLOR TEMP RED GAIN GREEN GAIN BLUE GAIN Adjust the width horizontal size and the height vertical size of the display H SIZE V SIZE Adjust the pin corner top when th...

Page 16: ...n to the Factory Preset Display Settings RECALL Adjust the vertical picture moire cancellation V MOIRE Adjust the horizontal picture moire cancellation H MOIRE Display horizontal vertical frequency and polarity STATUS All manuals and user guides at all guides com a l l g u i d e s c o m ...

Page 17: ...ment was done at each mode Therefore Factory preset mode has it s own value according to each control 3 Focus a Set brightness control to center and contrast control to MAX b Receive all H character pattern of 60KHz mode signal c Adjust the Focus control of FBT to obtain best Focus static focus and Dynamic focus 4 Geometric Distortion Adjustment a Receive the cross hatch pattern of VGA mode signal...

Page 18: ...e desired condition c Vertical red and blue lines are converged by varying the angles between the two tabs of the 4 pole magnets d Horizontal red and blue lines are converged by varying the tabs together keeping the angle between them constant e Apply a yellow cross hatch pattern on the display f Vertical green and red lines are converged by varying the angle between the two tabs of the 6 pole mag...

Page 19: ...in 6 3Vdc line of the Main PWB Check the blanking pulse circuit Check the signal cable No Character Is whole screen bright Yes Yes Yes Yes Yes No No No No No Yes Yes Rk Gk Bk About 40Vpp No No Is CRT Cathode Rk Gk Bk signal level normal Is the output signal of the pin 16 18 20 pre amp IC801 TDA9210 normal Is blanking pulse pin 20 of IC801 normal Is 6 3Vdc line normal Is input signal normal Trouble...

Page 20: ...n power supply unit Is CRT heater red hot No No No No No No No Yes Yes Yes Yes Yes Yes Yes Yes Is Heater Voltage CRT PWB about 6V Turn the Brightness Contrast control to set Maximum No Raster Is whole screen bright Check G1 voltage about 30V Is 100Vdc line normal Does turning the Sub Brightness control to the maximun on OSD menu make screen bright Is CRT G2 screen voltage about 450 550V Trouble in...

Page 21: ...e output of pre amp IC801 TDA9210 pin 16 18 20 all normal Check video signal cable or video card Trouble in IC801 or its ambient circuit Trouble in video output circuit or ambient Replace Video output IC Trouble in 100Vdc line Replace CRT No No No No No Yes Yes Yes Yes Yes RK GK BK About 40V p p 0 7Vpp All manuals and user guides at all guides com a l l g u i d e s c o m ...

Page 22: ...bnormal OSD Font Is the output of IC803 pin 13 14 15 normal Trouble in 5V voltage line Refer to trouble in P S U Troubie in IC803 or its ambient circuit Trouble in IC803 and its ambient circuit One color is missing Refer to Missing Color No No Yes Yes Yes Yes No All manuals and user guides at all guides com ...

Page 23: ...ion of IC501 Trouble in IC501 Trouble in Horizontal output circuit No Raster Yes No Is the Collector wave form of Q504 normal Yes Yes Yes Trouble in Q505 and its ambient circuit Trouble in Q504 No No No Trouble in Q505 and its ambient circuit 10V 0V 11V 0V 66V Is the Collector waveform of Q505 normal All manuals and user guides at all guides com ...

Page 24: ... Unstable picture Is H Sync input pin of IC501 correct Check H Sync Out of Micom or its ambient circuits Is the pin 10 of IC501 12V Check the value of C513 R522 Yes Yes No No Trouble in IC501 All manuals and user guides at all guides com ...

Page 25: ...ambient circuit No Yes Is the output waveform of IC401 pin 6 normal Trouble in V Sync line or IC501 failure Yes No 45Vp p Is the output pulse of IC501 pin 23 normal Yes No Check V DY and ambient circuit Check the IC401 or ambient circuit All manuals and user guides at all guides com ...

Page 26: ...24 7 Focus Monitor remains unfocused Check Focus VR in FBT Is focus acceptable Trouble in Focus circuit FBT Yes OK No All manuals and user guides at all guides com a l l g u i d e s c o m ...

Page 27: ...0V 1 Check the CRT socket or connector wire 2 Trouble in FBT or CRT Check after adjusting the static focus finely by VR in FBT DF waveform FVH FVH FVV FVV No Yes Is the waveform of the pin 32 in IC501 correct Yes Trouble in Q602 R611 T601 Trouble in IC501 or C503 No All manuals and user guides at all guides com ...

Page 28: ...nce on the center area bad Is convergence on the fringe area bad Adjust static convergence Refer to Adjustment procedure of convergence Yes Adjust D Y Location Yes No Poor convergence All manuals and user guides at all guides com ...

Page 29: ...ure 9 1 Horizontal Size When the H Size on the OSD is changed is the H size changed No Yes Check pin 11 of IC501 and its ambient circuit It isn t out of order Abnormal H Size All manuals and user guides at all guides com ...

Page 30: ...heck the IC401 and its ambient circuit Check the pin 23 of IC501 and its ambient circuit No No Trouble V OSC Deflection Circuit Refer to V OSC Deflection circuit Yes Is the 3 5Vdc of pin 23 of the IC501 Yes Abnormal V Size All manuals and user guides at all guides com ...

Page 31: ...1 ambient circuit Is IC501 pin 8 normal Yes No Trouble in H V circuit No Raster Trouble in IC501 ambient circuit Is the IC501 pin15 H trigger correct Yes No Trouble in H trigger Trouble in power supply circuit Is B 45V line voltage normal No All manuals and user guides at all guides com a l l g u i d e s c o m ...

Page 32: ...side pincushion icon on OSD menu and adjust acceptable position Yes Check IC803 or their ambient circuit Is the pin 5 10 waveform of IC803 correct Yes No Check IC803or it s ambient circuit Trouble in H Size Is the waveform of IC803 pin 7 8 Yes No No All manuals and user guides at all guides com ...

Page 33: ...Vdc Trouble in D101 or Video Part No Is voltage of C105 8Vdc Trouble in D103 No Is voltage of T001 pin 7 130V 370V Trouble in D001 D002 D003 D004 C004 and TH001 No Is the waveform of Q001 Drain pin correct 400Vpp 620Vpp Trouble in T001 IC001 Q001 and D009 etc No Yes Yes Yes Yes Is voltage of C104 45Vdc Trouble in D102 or its ambient circuit No A All manuals and user guides at all guides com ...

Page 34: ...06 27Vdc Trouble in D108 No Is voltage of C109 13Vdc No Yes Yes Yes Is voltage of C108 13Vdc Trouble in D104 or vertical part P S U O K Trouble in D106 or horizontal part No A All manuals and user guides at all guides com ...

Page 35: ...TDA4856 Philips V Driver KA2142B Samsung PWM D A IIC Control H Linearity Coil TRL 531 X H Def Output TR Damper C S S witching IIC Control B PWM EUT Geometrical Compensation H V Moire Cancellation Dynamic Focus H V H Driver Drive Transformer B Booster H Size TR BD677A Fairchild FBT H V Converter Lienchang 85 MHz CRT ORION 17 2SC5681 SANYO DTV 1500MFP SGS IRF630A D1273 TRL 719B All manuals and user ...

Page 36: ...PCB LAYOUT 34 719B 719BF Main PCB Component Side All manuals and user guides at all guides com a l l g u i d e s c o m ...

Page 37: ...35 719B 719BF Main PCB Solder Side All manuals and user guides at all guides com ...

Page 38: ...36 719B 719BF CRT PCB Solder Side 719B 719BF CRT PCB Component Side All manuals and user guides at all guides com ...

Page 39: ...37 719BF Control PCB Solder Side 719BF Control PCB Component Side All manuals and user guides at all guides com ...

Page 40: ...38 Power Connection Section SCHEMATIC DIAGRAM All manuals and user guides at all guides com ...

Page 41: ...39 Control Vert out Section All manuals and user guides at all guides com a l l g u i d e s c o m ...

Page 42: ...40 Horizontal Section All manuals and user guides at all guides com ...

Page 43: ...41 Video Section All manuals and user guides at all guides com ...

Page 44: ...42 EXPLODED VIEW MECHANICAL PARTS LIST 719B 719B All manuals and user guides at all guides com ...

Page 45: ...719B 719BF 43 All manuals and user guides at all guides com ...

Page 46: ...important for safety and x ray radiation These should be replaced only with the types specified in the parts list 00020 W3475N731 CORD POWER 3 H05VV F 3X0 75 1 8 IV B001 5PB13857 COIL BEAD BI3857 AXIAL B003 5PB13890 COIL BEAD BI3890 B004 5PB13890 COIL BEAD BI3890 B005 5PB13890 COIL BEAD BI3890 B102 5PB13857 COIL BEAD BI3857 AXIAL B104 5PB13857 COIL BEAD BI3857 AXIAL B501 5PB13857 COIL BEAD BI3857 ...

Page 47: ... TP C885 CCZB1H102K C CERA 50V B 1000PF K C886 CCXB1H152K C CERA 50V B 1500PF K TAPPING C887 CCXB1H101K C CERA 50V B 100PF K TAPPING C889 CEXF1H100V C ELECTRO 50V RSS 10MF 5X11 TP C890 CCXF1H104Z C CERA 50V F 0 1MF Z LOC PART CODE PART NAME PART DESC C891 CCZB1H221K C CERA 50V B 220PF K C892 CCZB1H221K C CERA 50V B 220PF K C932 CMXL2E104J C MYLAR MEU 250V 0 1MF J CA202 9970770028 CONN AS SMH200 07...

Page 48: ...C201 1DWM240T IC MICOM NT68P62 IC202 124LC08B IC MEMORY 24LC08B LOC PART CODE PART NAME PART DESC IC401 1KA2142 IC V OUT KA2142 IC501 1TDA4856 IC H OSC TDA4856 IC801 1TDA9210 IC VIDEO PREAMP TDA9210 IC802 1TDA9536 IC VIDEO OUTPUT TDA9536 IC803 1DW0SD11 IC OSD NT6828 00005 L503 5MC0000081 COIL CHOKE CH 85D L504 5MC0000082 COIL CHOKE CH 272K L505 5MC0000085 COIL CHOKE CH 100A L801 5CPZ568K02 COIL PE...

Page 49: ... 6 4 7K OHM J R222 RD AZ472J R CARBON FILM 1 6 4 7K OHM J LOC PART CODE PART NAME PART DESC R223 RD AZ101J R CARBON FILM 1 6 100 OHM J R224 RD AZ202J R CARBON FILM 1 6 2K OHM J R225 RD AZ101J R CARBON FILM 1 6 100 OHM J R226 RD AZ202J R CARBON FILM 1 6 2K OHM J R227 RD AZ202J R CARBON FILM 1 6 2K OHM J R228 RD AZ183J R CARBON FILM 1 6 18K OHM J R229 RD AZ562J R CARBON FILM 1 6 5 6K OHM J R230 RD A...

Page 50: ...Z103J R CARBON FILM 1 6 10K OHM J R575 RD AZ472J R CARBON FILM 1 6 4 7K OHM J LOC PART CODE PART NAME PART DESC R576 RD AZ223J R CARBON FILM 1 6 22K OHM J R579 RD 4Z220J R CARBON FILM 1 4 22 OHM J R580 RD AZ824J R CARBON FILM 1 6 820K OHM J R581 RD 4Z100J R CARBON FILM 1 4 10 OHM J R584 RD 4Z473J R CARBON FILM 1 4 47K OHM J R585 RD 4Z473J R CARBON FILM 1 4 47K OHM J R586 RD 4Z473J R CARBON FILM 1 ...

Page 51: ...2 TZTC3202Y TR KTC3202Y AUTO 1959Y Q703 TZTA1270Y TR KTA1270Y AUTO 562Y LOC PART CODE PART NAME PART DESC R409 RD AZ682J R CARBON FILM 1 6 6 8K OHM J R418 RN AZ6491F R METAL FILM 1 6W 6 49K OHM F TP R420 RD 2Z811J R CARBON FILM 1 2 810 OHM J R545 RD AZ471J R CARBON FILM 1 6 470 OHM J R551 RD AZ124J R CARBON FILM 1 6 120K OHM J R701 RD AZ472J R CARBON FILM 1 6 4 7K OHM J R702 RD AZ103J R CARBON FIL...

Page 52: ...DAEWOO ELECTRONICS CO LTD 686 AHYEON DONG MAPO GU SEOUL KOREA C P O BOX 8003 SEOUL KOREA TELEX DWELEC K28177 8 CABLE DAEWOOELEC E mail djkoo web dwe co kr All manuals and user guides at all guides com ...

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