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Daewoo Lucoms 719B-3, Service Manual

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Daewoo Lucoms 719B-3 Service Manual Download Page 32

30

TROUBLESHOOTING HINTS

11. Power Supply Unit (P.S.U)

Trouble in P.S.U

Is

power switch

on?

Switch on

No

Yes

Yes

Is

fuse F001

O.K?

Check the power cord outlet
and diode D001, D002,
D003, D004, Q001

No

Is

voltage of C825

77Vdc?

Trouble in D813 or
Video Part

No

Is

voltage of C824

8Vdc?

Trouble in D812

No

Is

voltage of T001

pin 8 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 C822

54Vdc?

Trouble in D810 or
its ambient circuit

No

A

Summary of Contents for 719B-3

Page 1: ...b XGA COLOR MONITOR Model 719B 3 719BF 3 http www lucoms com July 2003 Service Manual DAEWOO LUCOMS CO LTD...

Page 2: ...GENERAL INFORMATION 7 PIN CONNECTOR 8 CAUTIONS FOR ADJUSTMENT AND REPAIR 8 OPERATION AND ADJUSTMENT 9 ALIGNMENT PROCEDURE 15 TROUBLESHOOTING HINTS 17 BLOCK DIAGRAM 32 SCHEMATIC DIAGRAM 33 EXPLODED VI...

Page 3: ...tial that these critical 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...

Page 4: ...ult in damage to the equipment 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 Statement...

Page 5: ...o the contacts with a 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 vol...

Page 6: ...horted together by conductive foam aluminum foil or comparable conductive material 7 Immediately before removing the protective material from the leads of replacement ES devices touch the protective m...

Page 7: ...ic suction 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...

Page 8: ...corresponding 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 rehe...

Page 9: ...rom 50Hz to 160Hz This 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 graphi...

Page 10: ...factroy The adjustment procedure 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...

Page 11: ...just the screen brightness according to each situation Move cursor to the left window on the OSD window Decrease the value of any selected function Launch OSD On Screen Display MENU window Move cursor...

Page 12: ...ightness according to each situation Move cursor to the left window on the OSD window Decrease the value of any selected function Launch OSD On Screen Display MENU window Move cursor to the high windo...

Page 13: ...ENU MENU MENU MENU OPERATION AND ADJUSTMENT PC GAME MOVIE POWER LIGHT CONTRAST The screen brightens progressively by 10 If you carry out general PC works such as document edition on the Movie mode you...

Page 14: ...y OSD OFF OPERATION AND ADJUSTMENT PC GAME MOVIE POWER LIGHT The screen brightens progressively by 10 If you carry out general PC works such as document edition on the Movie mode you may shorten the l...

Page 15: ...osition of 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...

Page 16: ...CTIONS Reset the screen 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...

Page 17: ...each mode In Factory Auto Alignment 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...

Page 18: ...e focus from the best over all focus on the display Also adjust the brightness to the desired condition c Vertical red and blue lines are converged by varying the angles between the two tabs of the 4...

Page 19: ...bient 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 Abo...

Page 20: ...o trouble in 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 Rast...

Page 21: ...G2 voltage normal Is the output of pre amp IC201 pin 19 20 21 all normal Check video signal cable or video card Trouble in IC201 or its ambient circuit Trouble in video output circuit or ambient Repl...

Page 22: ...aveform of IC501 normal Trouble in B Booster Circuit Check the B section of IC501 Trouble in IC501 Trouble in Horizontal output circuit No Raster Yes No Yes Yes Trouble in Q406 and its ambient circuit...

Page 23: ...Horizontal Unstable picture Is H Sync input pin of IC501 correct Check H Sync Out of Micom or its ambient circuits Is the pin 29 of IC501 12 13V Check the value of C402 R423 Yes Yes No No Trouble in I...

Page 24: ...3V DC line correct Check PWR 13V ambient circuit No Yes Is the output waveform of IC301 pin 5 normal Trouble in V Sync line or IC501 failure Yes No 45Vp p Is the output pulse of IC501 pin 13 normal Ye...

Page 25: ...23 6 Focus Monitor remains unfocused Check Focus VR in FBT Is focus acceptable Trouble in Focus circuit FBT Yes OK No TROUBLESHOOTING HINTS...

Page 26: ...t ORION 300V 120V SAMSUNG 300V 120V 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 th...

Page 27: ...Is convergence 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 TROUB...

Page 28: ...BLESHOOTING HINTS 8 Abnormal Picture 8 1 Horizontal Size When the H Size on the OSD is changed is the H size changed No Yes Check pin 24 of IC501 and its ambient circuit It isn t out of order Abnormal...

Page 29: ...301 pin 5 Check the IC301 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...

Page 30: ...r waveform normal Yes Yes No Trouble in IC501 ambient circuit Is IC501 pin 26 normal Yes No Trouble in H V circuit No Raster Trouble in IC501 ambient circuit Is the IC501 pin 1 H trigger correct Yes N...

Page 31: ...Select the side pincushion icon on OSD menu and adjust acceptable position Yes Check IC501or their ambient circuit Is the pin 11 waveform of IC501 correct Yes No Check IC501 or it s ambient circuit Tr...

Page 32: ...004 Q001 No Is voltage of C825 77Vdc Trouble in D813 or Video Part No Is voltage of C824 8Vdc Trouble in D812 No Is voltage of T001 pin 8 130V 370V Trouble in D001 D002 D003 D004 C004 and TH001 No Is...

Page 33: ...31 Is voltage of C827 13Vdc No Yes Yes Is voltage of C908 12Vdc Trouble in D908 or FBT part P S U O K Trouble in D814 or horizontal part No A TROUBLESHOOTING HINTS...

Page 34: ...32 BLOCK DIAGRAM 719B 3 719BF 3...

Page 35: ...33 SCHEMATIC DIAGRAM 719B 3 719BF 3...

Page 36: ...719B 719B 3 34 EXPLODED VIEW MECHANICAL PARTS LIST...

Page 37: ...719B 719BF 3 EXPLODED VIEW MECHANICAL PARTS LIST 35...

Page 38: ...25pF D 0 5 F 1pF J 5 K 10 P 100 0 Z 80 Fig Part No Description Index R101 Resistors RD 4Z820J Carbon 82J R102 RD 4Z201J Carbon1 4W 200J Allowance F 1 J 5 K 10 M 20 G 2 Important Safety Notice Compone...

Page 39: ...F 5X11 TP The components identified by mark have special characteristics important for safety and x ray radiation These should be replaced only with the types specified in the parts list BC005 5PB1385...

Page 40: ...P C904 CMXM2A473J C MYLAR 100V 0 047MF J TP C905 CCXB3A472K C CERA 1KV B 4700PF K TAPPING C906 CEXF2V109V C ELECTRO 350V RSS 1MF 8 11 5 C907 CEXF2C479V C ELECTRO 160V RSS 4 7MF 8X16 TP C908 CEXD1H478F...

Page 41: ...TIN COATING J024 85801065GY WIRE COPPER AWG22 1 0 65 TIN COATING J025 85801065GY WIRE COPPER AWG22 1 0 65 TIN COATING J026 85801065GY WIRE COPPER AWG22 1 0 65 TIN COATING J028 85801065GY WIRE COPPER A...

Page 42: ...FET IRF630B Q416 TZTA1266Y TR KTA1266Y AUTO 1015Y Q417 TZTA1266Y TR KTA1266Y AUTO 1015Y LOC PART CODE PART NAME PART DESC Q418 TKTD2061 TR KTD2061 Q801 TZTC3198Y TRANSISTOR KTC3198Y 1815Y AUTO Q803 TK...

Page 43: ...25J R CARBON FILM 1 6 2 2M OHM J LOC PART CODE PART NAME PART DESC R408 RD AZ103J R CARBON FILM 1 6 10K OHM J R409 RD AZ101J R CARBON FILM 1 6 100 OHM J R410 RD AZ101J R CARBON FILM 1 6 100 OHM J R411...

Page 44: ...ON FILM 1 4 15K OHM J R926 RD AZ123J R CARBON FILM 1 6 12K OHM J R927 RD AZ154J R CARBON FILM 1 6 150K OHM J R928 RD AZ104J R CARBON FILM 1 6 100K OHM J LOC PART CODE PART NAME PART DESC R929 RD AZ103...

Page 45: ...erence Components List Between 719B 3 and 719BF 3 719B 3 719BF 3 Part No Part Description Part No Part Description CDT 9979617041 M41KXU200XX021 9979617081 M41QEC200XX021 R468 RD AZ302J 1 6W 3K ohm RD...

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