It’s not actually my telly its a mates but heres the problem
The telly is a panasonic widescreen, flat tube. (not sure about the make though).
When the TV has been on for a couple of hours a regular plinging (best way to describe it) noise eminates from the back. I had a listen to it and it’s definately coming from the telly (i unplugged everything except the telly including the arieal) and the noise continued.
Speaking to the owner fo the TV he says the noise goes away after the telly’s been off a bit (say 30mins).
It’s been back to the shop and the guy left it running all day with the back off and said it didn’t make the noise so i thought either
a, the TV didn’t heat up enough, with the back off, to make the noise
b, the guy was lying and did nothing
Now speaking to someone else over the weekend they suggested it might be ‘dry joints’ i.e. it’ll need re-soldering.
I guessed at the color guns but know nothing about this sort of thing. Can anybody of the teeming millions help??
The description of the noise isn’t adequate to really give much of a diagnosis…
One common source of noises in TVs are transformers causing hum and such. In particular, a transformer can cause nearby parts of the case to vibrate.
One (WAG-class) possible cause is a transformer is trying to vibrate the back or some such, but the set needs to warm up enough before it can happen. With the back off, there is nothing to vibrate (or the heat doesn’t build up).
Another standard noise is due to sparking in or near parts such as the cathode end of the tube and the flyback transformer. Both of these are quite dangerous conditions and need to be fixed properly.
(I’m sorry, but “plinging” just isn’t helping me enough.)
Frequently, certain consumer electronic items tend to fail in a few common ways. Do a Google usenet search on the model of your tv, looking in the sci.electronics.repair and rec.video.* groups in particular. It is not likely to be a “do-it-yourself” repair. If it involves taking the cover off, have a pro do it.