Desktop motherboard repair ?

Thread Starter

DarthVolta

Joined Jan 27, 2015
521
I have 2 broken mobo's, ones for socket AM3+, the other is for IvyBridge chips iirc. I have a 3CH PSU to test the mobo, but IDK where to start. IDK where I should be expecting voltages, when no other parts are attached.

When I checked the AM3+ board it's a PC, it would make the PSU shutdown, even after the RAM and GPU where removed, but the PSU was fine.

So right now, I have the bare mobo, with a 24pin and 4pin cable attached, and 3Ch's I can test with. I might be able to find and fix a power section. But I wonder how many chips on this thing can tell the mobo to turn off the PSU, if they have a problem.

I could hook it to a full ATX PSU, but not yet.


I can't even find a decent block diagram of a modern mobo, by searching.
 

Thread Starter

DarthVolta

Joined Jan 27, 2015
521
The 5V rail is pulling 0.34A, that sounds awfully high, compared to the 12V rail pulling only 50mA


The mobo looks great, no odd sign's. Time to find what uses 5V.

Maybe that's normal tho, those big chips most use a fair amount just idling.
 
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