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Old 9th Sep 2021, 11:13 am   #12
Welsh Anorak
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Join Date: Apr 2005
Location: North Wales, UK.
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Default Re: First repair project - PYE 450 (Philips G11). Weird beam distortion.

That's an LCR replacement, so do check it has the word 'welded' written on the body since, as Geoffrey says, the early non-welded ones can fail.
Otherwise I've had the transistor on a heatsink on the top left of the power board (BD203?) give this fault, also the zener as R2B suggests. Whatever it is, the fault will be in the active smoothing circuit.
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