We recently had a cable guy install a DVR with our tv. It worked great that afternoon. The next morning we turned on the tv and a picture appeared. 10 seconds later the picture shrunk, developed lines horizontally, and moved to the top of the screen until it disappeared. After turning it off and back on it either does the same thing or doesn't show a picture at all. The sound is fine. Cable guy says the signal and DVR are fine.
What's wrong...how much to repair?
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Maybe faulty power switch or its blown a fuse or the powwer supply inside the TV is kaput.
If its out of warranty get in touch with a reputable TV mechanic and ask them to come and repair it. It might be good to get a ballpark figure on how much it's going to cost.
Check the audio menu and make sure it is in the stereo mode and that the alt sound is not on. some times the remote button gets pushed by mistake when turning it off. If everything in the menu looks ok it may be the cable converter box. If you can hear anything from the speakers the output is working. Try a DVD to see if you get sound from it.
You didn't mention if you were using the TV with a cable or satellite TV box which could have its sound turned down or be defective. Otherwise, if you have a VCR or DVD hooked up to the set, do you get sound then? With some TV's there is a menu selection where you can turn the speakers off and on some sets, there is a switch to mute the speakers. If you still can't get sound and the set is out of warranty, then a replacement is probably in order.