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Panasonic CTP2780SF started to overscan

I have a Panasonic CTP2780S chassis AEDP218 that has begun to overscan
a little and the overscan varies with picture brightness, that is the
overscan is greater with a brighter scene. Lower corners overscan
slightly more than center. Noticeable on text scrolls mainly. Have not
attempted any Service Menu adjustments and have no service
manual/schematic. I replaced the power relay when it was 3 years old-
no other problems. Any insights/tips appreciated!
 
A

Art

Jan 1, 1970
0
Negative on service menu adjustments at this time, trouble shoot the main
power supply circuits and confirm the derived voltages being produced are
within specifications. Also that they do not very greatly depending on
brightness or picture level changes. Also you may want to check out the
pincushion and horizontal deflection circuits. Be advised, I've seen filter
caps check good with ESR and other Meter Devices both in and out of circuit
on these sets but still be defective.
 
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