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Tatung Vibrant VM99S, Service Manual

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Page 21

 VM99S

6

Troubleshooting

6-1 No Raster

Measure

voltage of B+ at

T402 pin 2 on

PWB-MAIN

No Raster

Check voltage of

cathode,  heater, Grid

1, Grid 2, etc.

Check I401

Normal

(137 V, 91kHz)

High

(175 V or more)

Yes

Short Circuit

at load?

0 V

No

Check

D801,T801,

R804, T804,

F801

Check I801,

Q803,  R814,

R813,  ZD807,

ZD801, R811,

R861, D825

Check DC B+ line,

Q402, Q404

Yes

Check

AC I/P on

C808

No

Summary of Contents for Vibrant VM99S

Page 1: ...19 inch Color Monitor VM99S Service Manual...

Page 2: ...ifications 5 3 Control Location and Functions 10 4 Operation Theory 11 5 Alignments and Adjustments 16 6 Troubleshooting 21 7 Recommended Spare Parts List 27 8 Block Diagram 29 9 Exploded Diagrams Ins...

Page 3: ...ever to exceed 1 1 2 Safety Checks Before returning the monitor to the user perform the following safety checks 1 Inspect to make certain that each lead dress is not pinched or that hardware is not lo...

Page 4: ...installing any component or assembly disconnecting PCB plugs or connectors and connecting a test component in parallel with a capacitor 3 When replacing parts or circuit boards clamp the lead wires ar...

Page 5: ...d 2 Test Setup a Test duration 3 seconds b Set current limit at 25 A c The grounding resistance must be less than 0 1 ohm 3 Test Procedure a Plug the monitor power cord to the tester terminals b Make...

Page 6: ...Frequencies Horizontal 30 to 96 kHz Vertical 50 to 160 Hz Signal Connectors 15 pin D shell connector Video Signals Analog 0 7 Vp p RGB positive Power Input 120 Watts maximum AC rated voltage 100VAC t...

Page 7: ...nt Pin Signal Pin Signal 1 Red video 9 5V 2 Green video 10 Digital Ground 3 Blue video 11 Ground 4 Ground 12 SDA 5 Ground 13 H Sync 6 Red ground 14 V Sync VCL 7 Green ground 15 SCL 8 Blue ground Note...

Page 8: ...14 561 14 561 13 333 10 971 10 667 B Blanking us 6 356 6 085 5 33 5 586 4 409 3 04 3 725 3 457 2 844 2 765 C S y n c u s 3 81 2 028 1 556 1 117 1 138 1 28 1 016 1 185 1 016 0 948 D B P u s 1 907 3 042...

Page 9: ...om Active OFF state back to ON state is around 10 seconds 2 5 TCO Version Optional The monitor meets the TCO 99 NUTEK energy saving electric and magnetic field requirements 2 5 1 TCO 99 Version Option...

Page 10: ...concerning restrictions on the presence and use of heavy metals brominated and chlorinated flame retardants CFCs freons and chlorinated solvents among otherthings The monitorisalso recyclable 3 Energy...

Page 11: ...olor for each mode 6 Power ON OFF To turn the monitor ON and OFF 3 3 Adjustment Procedure 1 Press 6 key to turn on the monitor 2 At normal condition press 1 on the front panel to activate the on scree...

Page 12: ...nction activated if fH 29 kHz and fH 96 kHz 6 Full range AC input and simplified line filter design 4 2 Microcontrol Section 1 This monitor uses NOVATEK NT68P65AU CPU It contains a 8 bit CPU core 256...

Page 13: ...V at pin 8 13V at pin 6 4 3 4 E W Trapezoid and H Width Controls 1 The scan current is determined by B the voltage of C413 that is obtained from step down circuit output Step down circuit include Q404...

Page 14: ...of C801 C802 C803 C816 C820 C823 T801 T804 and meets EMI regulation 4 4 3 Power LED Status 1 The LED has 3 leads with common cathode to emit green and amber color light for different power saving sta...

Page 15: ...101 Vcc pin12 reachesat 12V pin 5 6 getsa freerun sawtooth waveform about 25KHz and approximately 5 7Vp p when voltahe atpin 15 is higher than pin 16 5V reference then release pin 3 to be controlled b...

Page 16: ...that goes through R554 to I502 pin 10 and positive horizontal pulse from HFLB1 through R527 to I502 pin 5 CPU I701 pin 27 28 I2 C bus transfers information to I502 pin 7 8 2 The OSD R G B signals and...

Page 17: ...FD 750C or equivalent 2 30 kV high voltage probe HP34111A 3 Oscilloscope TEK2235 or equivalent 4 Minolta Color Analyzer II 5 Signal generator COMPAQ PC with proper display cards or Chroma 2250 2225 6...

Page 18: ...6 0 2 FL 1 g Set Brightness to cutoff get Y 0 01 0 03 FL 1 h Set Brightness to minimum CONDITION Display image 50 mm x 50 mm white block pattern PROCEDURE 2 65000 K color temperature setting 2 a Set B...

Page 19: ...ntrast to maximum 2 Adjust top VR at T101 static focus VR to make vertical line clear 3 Adjust center VR at T101 dynamic focus VR to make horizontal line clear 4 Repeat above procedures to get best fo...

Page 20: ...the screen 4 Rotate the pair of rings of 4 pole convergence magnets by maintaining spacing between the 2 tabs to converge the horizontal red and blue lines at the center of the screen 5 Rotate the in...

Page 21: ...ea with a manual degaussing coil 5 2 7 Manual Degaussing 1 Apply line voltage to the degaussing coil and move it in a rotary motion over the front sides and top of the monitor The coil should be kept...

Page 22: ...B MAIN No Raster Check voltage of cathode heater Grid 1 Grid 2 etc Check I401 Normal 137 V 91kHz High 175 V or more Yes Short Circuit at load 0 V No Check D801 T801 R804 T804 F801 Check I801 Q803 R814...

Page 23: ...Page 22 VM99S 6 2 OSD Abnormal Put on I502 Replace them No Check I502 missing Check R516 R526 R527 OK OSD Abnormal Yes No No Replace it Yes Yes Check J516 R556 OK Replace I502...

Page 24: ...I701 and I703 missing Power ON OFF again and check X701 oscillator OK Function Key Abnormal Yes No No Replace I703 or do ATE again Yes Replace I701 and check uP OK Yes Check I703 EEPROM content OK No...

Page 25: ...tal line Check or replace I301 Replace I301 Yes Check pin 5 O P waveform at I301 No Vertical Scan No Abnormal Still no vertical scan Normal Check pin 6 7 of I301 waveform Check or replace CRT Check I3...

Page 26: ...esent at pin 15 of I401 Check I401 pin 8 H output frequency Out of Horizontal Synchronization No Yes No Check Q401 T401 Q402 R402 R403 C404 R404 D402 Q410 6 6 Out of Vertical Synchronization Ckeck sig...

Page 27: ...ce the signal cable or I501 Yes Check waveform at I501 pin 18 19 and 20 Check I901 pin 1 3 and 2 voltage and wave form RGB Video AMP Abnormal Yes No Yes No Replace I901 Video signal present at the pin...

Page 28: ...SE TIME LAG 5ST4 4A 250V 8 I301 6442026400 IC TDA4863 9P PHILIPS 9 I401 6442030000 IC TDA4841 32P SDIP PHILIPS 10 I501 6442031500 IC LM1267 11 I701 6448017800 IC NT68P65AU 42P PDIP NOVATEK FLASH 12 I8...

Page 29: ...32300 LM2465 9P 29 I402 6442005900 LM324 14P 30 I801 6442006720 KA3843B 31 I301 6442026400 IC TDA4863 9P PHILIPS 32 R813 6221215852 0 15 OHM 2W 33 I703 6448015720 MICRO CHIP IC 24LC08B 8P 34 D818 6412...

Page 30: ...1 XRP CKT P501 R G B HEATER P505 G1 G2 FOCUS 1 FOCUS 2 HV CLBL SDA1 SCL SDA DDC 5V V SYNC H SYNC SCL SDA O R HFLB1 48V P301 H H V V VTTL HTTL SCL1 SDA1 SCL1 SDA1 10 7V 37V 13V VOUT 1 VOUT 2 XRP 180V 8...

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