Re: First repair project - PYE 450 (Philips G11). Weird beam distortion.
D4021, a 27V zener diode type BZX79C27 on the PSU panel can cause this problem on the G11 particularly if it is 100Hz ripple (are there 2 moving kinks on each side of the screen?) this is part of the active smoothing circuitry.
If it was fixed distortion (ie. not moving) then the EW circuit has a problem.
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