Well, I guess it is good that D109 is really working.? That removes one more variable
I wouldn't jump to the conclusion that it's one of the major ICs yet (because I'm stubborn: it could be one of them, but they are normally less likely to fail, so I usually try everything else first).
But I also don't know what else I can have you try that only requires a DMM, and not difficult part removal.
Do you have a way to measure the current that is being drawn, before and while you press the 'on' button?? It would be interesting to know, but may not lead directly to the problem.? My next step would be to use an oscilloscope to look at some signals to ascertain which of my #1 or #2 hypothesis (of the previous post) is correct, if either, and then, based on that answer, to selectively start lifting parts legs to find what will change the behavior.?
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Other than that, I am out of ideas for right now.? Maybe someone else can think of something.?
Stan KC7XE
