Recently I replaced an ati 9700 pro graphic card with a 9800 pro. In the process I uninstalled all the old software (using the add/delete software feature of the control panel, and then following up with drivercleaner).
I then installed the new ati software from the disk that came with the 9800.
Everything now works, and the old TV wonder card (remote version) seems to produce a better picture.
But on channel 14, and on channel 14 only, there is a distinct audio hum, and it trills into the picture, somehow, so that the picture has a banded, vibrating quality. It never had this problem with the old 9700 pro in place. It is a completely new problem.
Seems like interference on a very specific frequency.
I have been through the obvious steps -- shifting the card to a different slot, moving wires around, cutting off household frequency generators (cell phones, wireless phones, wireless printer, wireless networks, etc. ) Nothing helps, or even affects the amplitude or quality of the hum on channel 14.
One thought is, the TV wonder is reacting to the motor on the cooler of the new 9800?
I would just let it go, it is only one channel after all, but I like to watch Channel 14. It is the Food Channel.
It occurred to me to re-run the Autoscan for channel selection in the Setup (on the TV menu). Since this feature detects, sets and locks the TV card's tuning frequencies, I thought -- maybe it can be susceptible to error.
So I ran the Autoscan a second time. Suddenly, Channel 14 is clear as a bell, picture and sound. So the Food channel is back.
I'm having the same problem. I followed what you did and ran an autoscan. It skipped over channel 14, but when I manually changed to channel 14 after the autoscan finished, it was clear as a bell. However, it doesn't last. As soon as you close the TV and come back in, it goes back to going all funny.
Is there anything you did to make the fix permanent?