I'm working on a Zenith PVY5265DT projection TV (from 1997). It came in with QX3502 shorted and an open fuse in the power supply. I replaced the fuse, QX3502 and the HV splitter because it was drifting out of focus. Everything seemed normal for several days of running it all day. About a month later the set came back with the same problem. QX3502 is part of the HV regulator circuit.
I know the later Zenith projections TVs are full of desing problems and common failures. Has anyone seen anything like this before? Andy Cuffe
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