vertical lines on tv

Could be that the TV signal is too strong, or that there is "ingress".

If possible, swap the cable between the computer and TV and see if the interference moves - that means bad cable or splitter. Could also just be a loose connection or bad cable end.

That's what I would suggest. One sure way to check ingress is to tune the tv to a channel that you can get off air. If it is worse, or if only off air channels have the problem then you have an ingress issue. Check for loose connections, bad splitter, or even an exposed core (especially if you have a high squirrel population).

What do they make your cables out of... the Squirrel population there must be especially mal-nourished! I've seen such lines caused by power supply issues within the PC but I'd also check alternative inputs (such as testing the PC at a friends house) before going down the PSU path.

vertical lines are a symptom of interference at or very near the horizontal rate.

Do the lines move slowly or are they still?

My guess is that the shield has come loose on the F connector of the RF cable feeding the tuner and is picking up interference from the logic circuits in the computer or from the sweep circuit in the monitor.

Mark

I've seen drops chewed almost in two because of squirrels. Ingress is horrible at that point. When a sub calls with a particular channel out I check the drop and 9 times out of 10 it is chewed.

We had some .750 super trunk cable chewed so bad that the remaining aluminum fused and took out over half of our cable system. The damaged cable was replaced, and the squirrels chewed through the new wire in less than a week. After that repair they smeared the wire with poison to stop the chewing. Our guys were tired of the emergency repairs at a busy intersection near downtown Cincinnati, oh.

Thanks for the replies. The lines are stationary and spaced about a quarter of an inch apart. I just took out the tv tuner, and replaced the cable to rca adapter that was in there. It seems to have made a noticeable difference, although I still can faintly see the lines on higher channels. I think the problem is either with the tuner, or EM interference. Maybe shielding of some sort will help.