I have a panasonic 52" which was purchased in 1994 approx.
recently after 30 minutes of viewing the picture jumps and is scrambled ./ does anyone out there know why this is happening before i get someone over to check it out.. cuz with these big screens it's almost impossible to bring them in for repair... thus the $$$$$ for some one to come over...
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It's probably cap related... The +/- 30 or 12 volt lines feeding the tuner could be disrupted if a high esr cap is failing... ESR stand for equivilent series resistance and when a cap like that begins to fail it takes longer and longer to warm-up to its peak or in your case heats up beyond it's tolerance and fails to dissipate voltage at a correct rate affecting the circuit its in - in this case the tuner.
Not normally an expensive job but not one I'd want to do in-home. Good chance the tech will need to trace test the circuit with a scope anf ESR meter. Kinda like tearing an engine down to it's basic components if you know what I mean. You're better off taking the unit to them, saving the pickup delivery charges, and as always get an estimate in writing before any repairs are made over your okay amount...
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Unfortunately, JVC service manuals are not usually available outside of Authorized service centers. That being said,anyone that services TVs should have seen similar symptoms on other sets and should be able to "fix" this one even without a schematic. Call around. In the meantime, I'll look into this a bit more.
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we lost all the papers when we moved.