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5 Troubleshooting
5-3 No OSD
WAVEFORMS
There is video but no OSD.
11
11 12
Does input signal appear 13 at the Pins 2, 5 and 10 of IC404? Yes
No Check IC405 and related circuit.
CH1 RMS = 4.18V
12
While pushing a front control button does any pulse appear at Pin 12 of IC404? Yes
No Check IC404 and related circuit.
CH1 RMS = 3.26V
Replace IC404.
13
CH1 RMS = 3.26V
5-4
SyncMaster 770TFT
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