Daewoo 715B Service Manual Download Page 1

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DAEWOO ELECTRONICS CO., LTD.

http : //svc.dwe.co.kr

Service Manual

XGA COLOR MONITOR

Model : 715B

Summary of Contents for 715B

Page 1: ...DAEWOO ELECTRONICS CO LTD Service Manual XGA COLOR MONITOR Model 715B...

Page 2: ...tment 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 function Reform th...

Page 3: ...sub Menu function Move a sub Menu function Increase the value of any selected function Adjust the contrast directly when there is no OSD Move a sub Menu function Decrease the value of any selected fu...

Page 4: ...10 Key Process When you choose the icon on the OSD window you can exit the OSD screen MENU SELECT OSD OFF MENU MENU MENU...

Page 5: ...eaning left or right Adjust the pin corner top when the top sides of the screen are bowed T PIN CORNER PARALLELOGRAM Adjust the trapezoid of the screen by moving the lines inward or outward Adjust the...

Page 6: ...ust the horizontal picture moire cancellation H MOIRE Degaussing keeps the monitor free from unwanted magnetism that can result in color impurity DEGAUSS Adjust the blue bias BLUE BIAS Select language...

Page 7: ...de H size V size H phase V position Pincushion Trapezoid are adjusted at each mode In Factory Auto Alignment was done at each mode Therefore Factory preset mode has it s own value according to each co...

Page 8: ...djust 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 pole magnets d Horizontal red and blue lines are converged...

Page 9: ...0 12 and their ambient circuit Trouble in 12Vdc line Check the clamping 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 10: ...er to trouble in P S U Refer to 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...

Page 11: ...grid G1 G2 voltage normal Is the output of pre amp IC801 KA2500 pin 21 24 26 all normal Check video signal cable or video card Trouble in IC801 or its ambient circuit Trouble in video output circuit...

Page 12: ...ter Voltage about 6V Abnormal OSD Font Is the output of IC803 pin 12 13 14 normal Trouble in Heater voltage line Refer to trouble in P S U Troubie in IC803 or its ambient circuit Trouble in IC803 and...

Page 13: ...01 normal Trouble in IC501 Trouble in Horizontal output circuit No Raster Yes No Is the Gate wave form of Q553 normal Yes Yes Yes Trouble in Q553 Trouble in Q551 Q552 No No No Trouble in Q554 and its...

Page 14: ...20 6 Unstable Picture 6 1 Horizontal Unstable picture Is H Sync input pin of IC501 correct Check H Sync Out of Micom or its ambient circuits Yes No Trouble in IC501...

Page 15: ...correct Check PWR 13V ambient circuit No Yes Is the output waveform of IC401 pin 5 normal Trouble in V Sync line or IC501 failure Yes No 45Vp p Is the output pulse of IC501 pin 4 normal Yes No Check...

Page 16: ...22 7 Focus Monitor remains unfocused Check Focus VR in FBT Is focus acceptable Trouble in Focus circuit FBT Yes OK No...

Page 17: ...in 4 of FBT 2 Check D705 1 Check the 12V DC line 2 Check Q703 Q704 Check after adjusting the static focus finely by VR in FBT DF waveform FVH FVH FVV FVV No Is the base voltage of the Q703 about 12V Y...

Page 18: ...onvergence 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 conver...

Page 19: ...25 9 Abnormal Picture 9 1 Horizontal Size Is the HV 25 8KV No Yes Check the IC501 and R503 C507 Abnormal H Size Adjust the HV VR601...

Page 20: ...DC voltage of IC401 pin 1 Check the IC401 and its ambient circuit Check the IC501 and its ambient circuit No No Trouble V OSC Deflection Circuit Refer to V OSC Deflection circuit Yes Is the 3 5Vdc of...

Page 21: ...Q603 Q604 12V Line Is Q604 Q603 Base waveform normal Yes No Trouble in IC601 Is IC601 pin 10 normal Yes No No Trouble in H V circuit No Raster Trouble in IC601 ambient circuit Is the IC601 pin5 H tri...

Page 22: ...ncusion distortion is excessive or barrel O K Select the side pincushion icon on OSD menu and adjust acceptable position Yes Check IC501 or their ambient circuit pin 13 14 Is the pin 5 waveform of IC5...

Page 23: ...age of C101 100Vdc Trouble in D101 or Video Part No Is voltage of C110 7 0Vdc Trouble in D104 No Is voltage of T001 pin 8 130V 370V Trouble in D001 D002 D003 D004 C004 and TH001 No Is the waveform of...

Page 24: ...30 Is voltage of C112 25Vdc Trouble in D105 No Is voltage of C117 14 3Vdc No Yes Yes Yes Is voltage of C643 15Vdc Trouble in D643 or vertical Part P S U O K Trouble in D103 or horizontal Part No A...

Page 25: ...V DRV AMP TDA9302H V DY H OSC V DRV uPC1888CT FILTER SMPS KA3842 2SK2101 SMPS TRANS B CONTROL H DRV H DY H VTG B CONTROL KA7500B FBT SCL SDA H L GND SDA SCL H V SYNC SDA SCL H V SYNC SCL SDA H VTG SC...

Page 26: ...35...

Page 27: ...36 ECHANICAL PARTS LIST...

Page 28: ...pF 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 37 INFORMATION OF PART DESCRIPTION...

Page 29: ...MXF2D334J C MYLAR 200V MPP 0 33MF J TP B001 5PB13890 COIL BEAD BI3890 B002 5PB13857 COIL BEAD BI3857 AXIAL B003 5PB13857 COIL BEAD BI3857 AXIAL B004 5PB13857 COIL BEAD BI3857 AXIAL B005M 5PB14865 COIL...

Page 30: ...TRO 50V RSS 100MF 8X11 5 TP C552 CMXM2A104J C MYLAR 100V 0 1MF J TP C553 CMXL2E104J C MYLAR MEU 250V 0 1MF J C555 CMXL2A154J C MYLAR MEU 100V 0 15MF J C556 CMXH3C272J C MYLAR BUP 1 6KV 2700PF J TP C55...

Page 31: ...A1024Y 949Y Q651 TZTC3198Y TR KTC3198Y 1815Y AUTO Q701 T2N3904 TR 2N3904 Q702 T2N3904 TR 2N3904 Q703 TKSC5042F TR KSC5042F D603 DZN4148 DIODE 1N4148 AUTO 52MM D605 DER206 DIODE ER206 D607 DZN4148 DIOD...

Page 32: ...J R541 RD AZ122J R CARBON FILM 1 6 1 2K OHM J Q704 TKSC5042F TR KSC5042F R001 RC 2Z105J R CARBON COMP 1 2 1M OHM J SR37 R002 RS01Z333J R M OXIDE FILM 1W 33K OHM J TAPPING R003 RS01Z333J R M OXIDE FIL...

Page 33: ...815 RD AZ100J R CARBON FILM 1 6 10 OHM J R542 RD AZ103J R CARBON FILM 1 6 10K OHM J R543 RD AZ104J R CARBON FILM 1 6 100K OHM J R544 RD AZ183J R CARBON FILM 1 6 18K OHM J R545 RD AZ122J R CARBON FILM...

Page 34: ...T50KOHMBTAP X201 5XE12R000E CRYSTALQUARTZ HC 49 U12 00000MHZ30PPM R816 RD AZ391J R CARBON FILM 1 6 390 OHM J R817 RD AZ100J R CARBON FILM 1 6 10 OHM J R818 RD AZ472J R CARBON FILM 1 6 4 7K OHM J R819...

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