Quote:
Originally Posted by Ed in Tx
Yes. Any of those you mentioned.
Repeat tip: NEVER apply unlimited power to a failed SMPS always use a series incandescent light bulb, I recommend 40W in this case, when first testing it out.
You'll probably find the drive transistor shorted, cannot tell from your pic either a shadow or blackened circuit board in that area. May find a protection Zener diode on the secondary side, maybe a shorted diode or two, too. Don't take that as gospel! I said "probably", as in might, may...
And check all capacitors for ESR. Replace those with higher than normal resistance.
my 2¢.
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Many thanks for the tips and sense of direction! I'll get right on it. There are darkened areas on the SMPS part of the board, though I admit to assuming those are just 'baking' of the board from residual heat over the years.