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November 7, 2006, 11:59 pm
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When first turned on the picture fills the screen, but as the set warms
the picture can shrink to a couple of cm in the middle of the screen if
it gets warm enough.
The nearest schematic I have is for a 6390 but I should the a 6391
Supply voltages seem o.k. and appear to stay the same as the set warms.
Capacitors should improve when they warm up, but I replaced a few
Using a hairdrier, the most sensitive area seems to be near IC201
I have tried freeze spray, but nothing I freeze seems to change the
size of the pic.
If the set cools on its own, the picture returns to normal.