Dell 1700FP Service Manual page 16

5 Troubleshooting
5-3 No OSD
There is video but no OSD.
Does input signal appear
at the Pins 2, 5 and
11 12 13
10 of IC404?
Yes
While pushing a front control
button does any pulse appear
at Pin 12 of IC404?
Yes
Replace IC404.
5-4
No
Check IC405 and related circuit.
No
Check IC404 and related circuit.
WAVEFORMS
11
CH1 RMS = 4.18V
12
CH1 RMS = 3.26V
13
CH1 RMS = 3.26V
1700FP