Sierra Wireless 800TFT specifications No OSD, Waveforms

5 Troubleshooting

5-3 No OSD

There is video but no OSD.

Does input signal appear

1112 13 at the Pins 2, 5 and

10 of IC404?

Yes

While pushing a front control button does any pulse appear at Pin 12 of IC404?

Yes

Replace IC404.

No

No

Check IC405 and related circuit.

Check IC404 and related circuit.

WAVEFORMS

11

CH1 RMS = 4.18V

12

CH1 RMS = 3.26V

13

CH1 RMS = 3.26V

5-4 SyncMaster 800TFT