Hey Don,
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I suppose you meant the pass transistor for the 100V plug-in supply as the 158V is display side.
Good point about the associated components creating a spurious voltage, didn't think of that.
I've taken the Motorola 2N4240 pass transistor out and it reads good on the multimeter and on the chinese component tester.?
I'm checking the rest of the circuit. I've digged the groups.io and people have reported just about every possible component can fail.?
We'll see what I find.
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Arnaud.
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