Daewoo 531B Service Manual Download Page 20 | Manualshive

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MODE

B+ Voltage

VGA

60Vdc

68K

130Vdc

54KHz

110Vdc

19

5. Horizontal Output Circuit

Is the

B+line voltage

over 50V?

Is the H-out

waveform of IC501

normal?

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

No

No

No

Trouble in Q505 and

its ambient circuit.

3V

0V

50V

Is the Drain

waveform of

Q507 normal?

Trouble in 50V

Trouble in Q506

0V

0V

70V

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Summary of Contents for 531B

Page 1: ...DAEWOO ELECTRONICS CO LTD Service Manual XGA COLOR MONITOR Model 531B 532B ...

Page 2: ...to 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 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 s...

Page 3: ...ectrically shorted 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 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...

Page 4: ...an anti static 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 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 Remova...

Page 5: ...arity wrap each lead out of the new diode around the 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 reheat them and apply additional solder if necessary TECHNICAL INFORMATION CDT Size 15 inch Diagonal visible image area 14 inch Dot Pitch 0 28 mm Synch...

Page 6: ... horizontal resolution of 1280 dots and a maximum vertical resolution of 1024 lines for superior clarity of display By accepting analog signal inputs which level is zero to 0 7 Volts This color monitor can display and unlimited palette of colors depending on the graphics adapter and software being used Abbreviations 7 GENERAL INFORMATION ADJ Adjustment AFC Automatic Frequency Control CRT Cathode R...

Page 7: ...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 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 servic...

Page 8: ...ected function 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 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 ...

Page 9: ...10 When you choose the icon on the OSD window you can exit the OSD screen OSD OFF MENU MENU MENU MENU DEGAUSS UT L TY EX T UT L TY MENU MENU 531B Key Process ...

Page 10: ... 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 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 ...

Page 11: ... When you choose the icon on the OSD window you can exit the OSD screen 532B Key Process OSD OFF MENU MENU MENU MENU MENU MENU UT L TY EX T UT L TY DEGAUSS ...

Page 12: ... TRAPEZOID Adjust the left and right margins for more convex or more concave margins PINCUSHION Adjust the rotation when the screen is tilted left or right Optional ROTATION Choose different preset color temperatures or set your own customized color parameters COLOR TEMP Adjust the position of the display horizontally left or right and vertically up or down H CENTER V CENTER Adjust the red gain Ad...

Page 13: ...ettings RECALL ICON CONTROL FUNCTIONS Adjust the vertical picture moire cancellation V MOIRE Adjust the horizontal picture moire cancellation H MOIRE Select language for OSD 5 languages LANGUAGE Display horizontal vertical frequency and polarity STATUS ...

Page 14: ...er pattern of 1024 X 768 48KHz 60Hz c Adjust the Focus control of FBT to obtain best Focus 4 Geometric Distortion Adjustment a Receive the cross hatch pattern of factory preset mode b Pincushion Trapezoid Pin Balance are adjusted the best geometric status 5 White Balance Adjustment a Select 9300 K on the OSD Menu b Receive a full white pattern of 54KHz mode signal by using the signal generator c S...

Page 15: ...varying the angle 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 display f Vertical green and red lines are converged by barying the angle between the two tabs of the 6 pole magnets g Horizontal green and red lines are converged by varying the tabs ...

Page 16: ...eck 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 About 30 35Vpp No No Is CRT Cathode Rk Gk Bk signal level normal Is the output signal of the pin 14 16 18 pre amp IC801 normal Is blanking pulse pin 20 of IC801 normal Is 12V line normal Is input signal normal Trouble in IC801 and its ambient circuit 5Vp p A...

Page 17: ...Refer to trouble in P S U Refer to trouble in power supply unit Is CRT heater red hot No Yes No No No No Yes No Yes Yes Yes Yes No 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 60V Is 100Vdc line normal Does the Brightness control make screen bright Is CRT G2 screen voltage about 730V Trouble in CRT Ra...

Page 18: ...Each grid G1 G2 voltage normal Is the output of pre amp IC801 TDA9210 pin 14 16 18 all normal Check video signal cable or video card Trouble in IC801 or its ambient circuit Trouble in video output IC802 or ambient Trouble in 100Vdc line Trouble in G1 G2 line Replace CRT No No No No No Yes Yes Yes Yes Yes RK GK BK About 40V p p 0 7Vpp ...

Page 19: ...ater Voltage about 6V Abnormal OSD Font Is the output of IC204 pin 13 14 15 normal Trouble in Heater voltage line Refer to trouble in P S U Troubie in IC204 or its ambient circuit Trouble in IC204 and its ambient circuit One color is missing Refer to Missing Color No No Yes Yes Yes Yes No ...

Page 20: ...s the H out waveform of IC501 normal 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 No No No Trouble in Q505 and its ambient circuit 3V 0V 50V Is the Drain waveform of Q507 normal Trouble in 50V Trouble in Q506 0V 0V 70V ...

Page 21: ... of the IC501 correct Trouble in IC501 or its ambient circuit Is the pulse of pin 28 of the IC201 correct Check IC501 and its ambient circuit No No No Yes Yes Is the input H Sync correct Check IC201 and its ambient circuit Yes Trouble in Signal Cable or 15P D Sub Connector 5Vpp ...

Page 22: ... voltage is correct Refer to P S U Is the pulse of pin 6 of the IC401 correct Trouble in vertical D Y No No No Yes Yes Is the output of pin 8 of IC501 all normal Check IC401 and its ambient circuit Yes Check the IC501 and its ambient circuit 50Vp p 40V 10V ...

Page 23: ...22 7 Focus Monitor remains unfocused Check Focus VR in FBT Is focus acceptable Trouble in Focus circuit FBT Yes OK No ...

Page 24: ...Convergence 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 ...

Page 25: ...H OSC Deflection Circuit Refer to Horizontal Output circuit Is the DC level of the base of Q517 changeable No Yes Is the DC level of IC501 pin 11 changeable Yes Check IC501 pin 11 Is the collector pulse of Q505 correct Is the cathode waveform of D509 correct Abnormal H Size 1100Vp p 80 310Vpp Normally anode voltage of CRT is approximately 24 7KV Scan B are as follow No Yes Yes No At first adjust c...

Page 26: ... 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 pin 21of the IC501 Yes Abnormal V Size ...

Page 27: ... Check the Base waveform of the Q515 Yes Pincusion distortion is excessive or barrel O K Select the side pincushion icon in OSD menu and adjust acceptable position Yes Is the pin 11 waveform of IC501 correct No No Trouble in IC501 ...

Page 28: ...1 or IC001 and its ambient circuit Trouble in diode D001 D002 D003 D004 or peripheral device No Is the waveform of T001 pin5 correct Trouble in T001 or D101 No Trouble in P S U Is power switch on Switch on No Yes Yes Yes Yes Yes Yes Is voltage of C102 100Vdc Trouble in T001 or D102 No Is fuse F001 O K Check the power cord outlet and diode D001 D002 D003 D004 No A ...

Page 29: ...28 Is voltage of C105 8Vdc Trouble in D103 No Is voltage of C109 13Vdc No Yes Yes Yes Is voltage of C108 12Vdc Trouble in D104 or vertical part P S U O K Trouble in D106 or horizontal part No A ...

Page 30: ...PS Transformer MCU NT68P62 Novatek H V OSC Processor TDA4856 Philips V Driver KA2142B Samsung PWM D A IIC Control H Linearity Coil TRL 531B H Def Output TR Damper C S Switching KSC5802 SDS06F150S Fairchild 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 ...

Page 31: ...PCB LAYOUT 30 Main PCB Component Side ...

Page 32: ...31 Main PCB Solder Side ...

Page 33: ...32 CRT PCB Component Side CRT PCB Solder Side ...

Page 34: ...33 DIAGRAM on Section ...

Page 35: ...34 on ...

Page 36: ...35 ...

Page 37: ...36 tion ...

Page 38: ...37 ...

Page 39: ...5pF D 0 5 F 1pF J 5 K 10 P 100 0 Z 80 Fig Part No Description Index R102 Resistors RD AZ301J Carbon 1 6W 300J R105 RD 4Z331J Carbon 1 4W 330J Tolerance F 1 J 5 K 10 M 20 G 2 INFORMATION OF PART DESCRIPTION Important Safety Notice Components identified with the International Symbol have special characteristics important for safety When replacing any components use only manufacturer s specified part...

Page 40: ...entified 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 LOC PART CODE PART NAME PART DESC C209 CCXB1H102K C CERA 50V B 1000PF K TAPPING C210 CCXB1H181K C CERA 50V B 180PF K TAPPING C211 CCXB1H181K C CERA 50V B 180PF K TAPPING C214 CCXB1H103K C CERA 50V B 0 01MF K C216 CEXF1H100V C ELECTRO 50V RS...

Page 41: ... K TAPPING C823 CCXB1H101K C CERA 50V B 100PF K TAPPING C824 CCXB1H101K C CERA 50V B 100PF K TAPPING C825 CCXB2H471K C CERA 500V B 470PF K TAPPING C826 CCXF1H104Z C CERA 50V F 0 1MF Z C827 CCXF1H104Z C CERA 50V F 0 1MF Z C831 CCXF1H104Z C CERA 50V F 0 1MF Z LOC PART CODE PART NAME PART DESC C833 CCXB1H682K C CERA 50V B 6800PF K TAPPING C861 CCXF1H104Z C CERA 50V F 0 1MF Z C862 CCXF1H104Z C CERA 50...

Page 42: ...PUT TDA9536 L502 5MH0000085 COIL H LINEARITY TRL 531B LOC PART CODE PART NAME PART DESC L503 5MC0000088 COIL CHOKE CH 120D L505 5MC0000088 COIL CHOKE CH 120D L801 5CPZ568K02 COIL PEAKING 0 56UH K AXIAL 3 5MM L831 5CPZ338K02 COIL PEAKING 0 33UH K AXIAL 3 5MM L861 5CPZ568K02 COIL PEAKING 0 56UH K AXIAL 3 5MM P001 9979500022 RECEPTACLE BNS 02AB2L 1 PR001 DECPAC140M POSISTOR ECPAC140M290 Q001 TSPP04N6...

Page 43: ...LM 1 6 100 OHM J R252 RD AZ511J R CARBON FILM 1 6 510 OHM J LOC PART CODE PART NAME PART DESC R253 RD AZ562J R CARBON FILM 1 6 5 6K OHM J R255 RD AZ562J R CARBON FILM 1 6 5 6K OHM J R256 RD AZ105J R CARBON FILM 1 6 1M OHM J R257 RD AZ511J R CARBON FILM 1 6 510 OHM J R258 RD AZ563J R CARBON FILM 1 6 56K OHM J R260 RD AZ362J R CARBON FILM 1 6 3 6K OHM J R262 RD AZ101J R CARBON FILM 1 6 100 OHM J R26...

Page 44: ...ARBON FILM 1 6 43K OHM J R615 RD AZ754J R CARBON FILM 1 6 750K OHM J R616 RD AZ624J R CARBON FILM 1 6 620K OHM J LOC PART CODE PART NAME PART DESC R617 RD 2Z184J R CARBON FILM 1 2 180K OHM J R618 RD 2Z184J R CARBON FILM 1 2 180K OHM J R619 RD 2Z822J R CARBON FILM 1 2 8 2K OHM J R620 RD 2Z102J R CARBON FILM 1 2 1K OHM J R621 RD AZ473J R CARBON FILM 1 6 47K OHM J R623 RD 4Z472J R CARBON FILM 1 4 4 7...

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