Riddled TV Repair Forum

zdpvg10 · Joined: 06 Sep 2009 Posts: 1

the problem im having is when your watching it after awhile a kind of black bar will start from the right side and move towards the center of the tv, but if you whack the side of the tv it will clear right up for sometimes up to an hour. I was told by a tv repair guy he thought it was a loose wire. i want to fix it my self and was wondering if anyone can give me a short walk through or advice where to start to find this prob and fix it.

thanks for any help you guys can throw my way.

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JTS1957 · Joined: 21 Jan 2009 Posts: 2395 Location: Far, Far Away

It sounds like some kind of bad joint.
First step is to open set up. If filthy you can take outside and use canned air or air compressor (LOW pressure) to blow out dust, etc.
Next I'd plug it in/hook it up and let it heat up "awhile." If it doesn't act up on its own I'd then take the plastic handle of a screwdriver and start gently tapping heat sinks, large ICs, etc. Do be careful of transformers, some have a compressed powdered iron core which can crack fairly easily. If you feel really adventurous you could take a dowel and prod, pull and push gently on the board. You are trying to narrow down the loose plug, wire, joint or area that's involved.
Next unplug set, let cool down and figure out how to loosen the board enough to examine the top and especially the bottom. I think you will probably find a bad joint in the horizontal deflection area. If nothing obvious try to at least resolder horizontal driver transformer, etc.
Well I don't know if that's a short walk or not, but if you need further feel free to post again. I may have the schematic.