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Pincushion diodes and horizontal outputs were a problem on the CRT panasonics as well as power supply electrolytics and IC's.
Also, look around the power relays. Bad connections are a problem there.
While you are in there, look over the caps around the vertical IC and the vertical IC connections. They were problematic.
Can you post a picture of the chassis.
Also, is it the Prism or the TAU set.
The TAU had CRT troubles (went gassy quick) and power supply intermittants that was connections all over the circuit board.
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