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In many later CRT sets, I've seen the switching power supplies run away with themselves and send hundreds of volts throughout the entire chassis. As you might expect, this isn't too good for sensitive parts such as IC's, the tuner, etc. You'd think that they'd include a fail-safe circuit as part of the power supply; but, most of these later sets were designed and built as cheaply as possible. A few years ago, someone gave me an SPC 13" Orion and that's exactly what happened to it. I don't know why I bothered; but, I actually fixed that set from parts from junk boards. I remember the over-voltage condition wiped out the tuner, the vertical output IC, the horizontal output transistor, some diodes, and some capacitors that had their tops blown out. I think the power supply fault was caused by an open resistor. If I found such a set today with that much damage, it would hit the trash can in short order.
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