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Re: Picture "jumps" at startup for about 20 minutes until...
You have some leaky filter caps. They are: C2C52 = 10 MFD 50 VOLT (off the base of Q2C51 on the signal board)Also check C2P05 = 100 MFD 16 VOLT (off pin #3 of IC2P01 on the signal board) and C2P03,C2P08 = 100 MFD 16 VOLT both on the signal board.
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There is a Anynet Setting under the input tab. It has to be on the right setting or the picture Jumps after 20-25 minute. Once I adjusted it to the right setting it stopped jumping and it now works Perfect. Would nt have figured it out if I wouldnt have been messing around with it as a last chance deal.
There is a module called a hyper board that is vertically mounted near the jack panel. Inside the module are 10mf/25v capacitors they are grtting weak. The module is fully shielded and pluggs into a socket. the module has 4 tabs (2 on each end) that must be unsoldered before it can be unplugged. This repair should be done by a qualified technician. The caps are surface mounts and very small. Unless you have excellent soldering skills and a rock steady hand DO NOT ATTEMPT to repair this problem on your own.
I gather from your post that wavy can mean two possible things as the TV comes on, you see the picture flow like ocean waves? In this case you may have 60Hz hum modulating with the picture, this is actually unlikely these days, but I have heard it happens sometimes.
The other thing it could be is light horizontal tearing. This happens when the horizontal frequency is too high or too low. You are not going to like my solution because I feel that for problems like this the set must be analyzed not just subjected to "shotgun troubleshooting", so here I go, Take the TV to a repair shop.
take it to a tech if you have not done so. your problem is lose solder.your board needs to be rsoldered over to connect your component properly over the years heat from the operation of the tv cause the soldr to lose grip on the board.good luck