View Single Post
Old 04-05-2018, 05:54 AM   #10
Agent24
I see dead caps
 
Agent24's Avatar
 
Join Date: Oct 2007
City & State: Hiding inside a plated-through hole
My Country: New Zealand
Line Voltage: 230VAC 50Hz
I'm a: Hobbyist Tech
Posts: 4,543
Default Re: Shuttle SD36G5M - Mobo died, recapped, still issues

I think you understand it quite well actually. Your info is good anyway. OK. So Q53 will be the high side MOSFET, and Q54 the low side.

At the very least, It seems Q53 likely is bad. The low side MOSFET is harder to check in-circuit because the CPU or chipset presents a low resistance to ground in parallel, but a dead short will of course be obvious. The 24.9 ohms you get there would likely be normal, but the readings show what looks like a short to the gate also, so Q54 is probably bad too.

I would remove both MOSFETs at this point and re-test them out-of-circuit, to see if any readings change.
__________________
"Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
-David VanHorn
Agent24 is offline   Reply With Quote