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5 Troubleshooting
5-4 SyncMaster 800TFT
Replace IC404.
Yes
No
There is video but no OSD.
5-3 No OSD
While pushing a front control
button does any pulse appear
at Pin 12 of IC404?
WAVEFORMS
Does input signal appear
at the Pins 2, 5 and
10 of IC404?
Check IC405 and related circuit.
Check IC404 and related circuit.
Yes
No
11 12 13
11
CH1 RMS = 4.18V
13
CH1 RMS = 3.26V
12
CH1 RMS = 3.26V