JTS1957
Joined: 21 Jan 2009 Posts: 2395 Location: Far, Far Away
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Posted: Sun Sep 06, 2009 8:02 am Post subject: |
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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. |
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