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This sound familar. it sounds like the hypermodule problem. idealy the best way to repair this is the past was to replace the hypermodule. but they are hard to find. Next idea is to repair the board. the way to do this is too replace 11 micro capacitors. But soldering these can be difficult and labor intensive. if you get a tv shop to do this find a qualified tech. prices differ on average this repair should cost about 400.
The hyper module is located in the metal box just behind the panel where all your cables plug into the tv. It is sodered to the board syou have to get under neath and melt the four places that the metal box is sodered. Once it's out you can either replace the whole board if you can find one. I can't seem to find it anywhere. you can also chage out all the 16v 10uf capacitors which is generally the source of the problem, but even these seem to be very difficult to locate now too.
Toshiba doesn't carry them anymore. Here is a link to the bulletin they put out becuase those capacitors are a known problem and failure point.
Unstable picture, wavy, jittery, and loss of sync are a symptom of bad capacitors in the hyper module. The problem is worse when the set is cold, but when warm the sympton gets less or goes away. In the latter stages the problem never gets better even after the set has been on for hours. There are about 6 surface mounted caps (10mf/16) inside the shielded Hyper module. The module is vertically mounted behind the jack panel and can be unplugged from its socket after unsoldering the 4 anchor tabs on the bottom side of the PCB. This type of repair should be made by a qualified technician do to the complexity of chassis removal and expert soldering skills.
if it is wavy lines across the top it is probably the scan converter/ hyper bd they are becoming hard to find/expensive you can repair them but it requires many surface mounted capacitors and requires some VERY skilled soldering.