[sdiy] Wiard/Blacet Miniwave issue - Help please

m brandenberg mcbinc at panix.com
Thu Mar 31 18:53:06 CEST 2016


On Thu, 31 Mar 2016, Thomas White wrote:

> Just gave a warm chip test. PS1 on the positive rail does get hot. No IC's get hot. When I wiggle the poly fuse on the positive rail operation goes normal then when I let it go the power drift down starts again. No time to solder as I have to go to work. Maybe a cold solder joint? I am thrown off by the wiggle solving things temporarily.

Possible but would tend to impede current and lower temperatures.
But clearly the fuse appears to be the problem.  Internal bonding
defect generating heat?  Time to replace.  But a really
interesting failure mode...

--
Monty Brandenberg



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