Re: First repair project - PYE 450 (Philips G11). Weird beam distortion.
Found it! On the board pictured in your manual, R19 and D21 are soldered in series across the large resistor R30 at the top left of the board. I'd expect your board to be like the one in my manual, however. Looks like a bit of an afterthought, but oddly D21's function is described in your manual's circuit description.
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