SAMSUNG SYNCMASTER 470STFT
Service Manual

4 Troubleshooting

4-2 No Video
Power indicator is green

Does the clock pulse appear at Pin 81, 83 and 84 of IC201?

No

5

Does the H-sync pulse appear at Pin 94 of IC201?

No

6

7

Does the pulse appear at Pin 9 of IC106 or Pin 1 of IC105? Yes

No

Yes Yes Replace IC201.

Replace IC106. Replace IC104 (SOG) or check R102 and Pin 13 of CN201 No Check IC201 and IC401.

9

10

Does the sync pulses appear at Pins 20 and 22 of IC303?

No

11

1

Does the sync pulses appear at Pins 34 and 39 of IC303? Yes

Yes

Replace IC303 or check its related circuit.

Do the sync pulses appear at Pins 25 and 26 of IC304?

2

3

No

8

Do the sync pulses appear at Pins 141 and 142 of IC301? Yes

No

Replace IC301 or check its related circuit.

Yes

Replace IC304 and IC305 or check its related circuit.

Do the waveforms appear at Pins 1 and 16 of CN301? Yes Replace LCD Panel

4

No

Replace IC304 and IC305 or check its related circuits.

4-2

SyncMaster 470STFT