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Old 06-01-2021, 08:19 PM   #12
waldoalvarez00
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Join Date: Dec 2015
City & State: Santiago
My Country: Dominican Republic
Line Voltage: 110v
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Posts: 56
Default Re: Tesla m40 burned my motherboard VRM

Ok probably you are right about motherboard VRM since is 12v and shouldn't be going through motherboard VRM.

I do however tested 12v pcie pins looking at the pinout (first 3 side B)

https://pinouts.ru/Slots/pci_express_pinout.shtml

to ground and they read like shorted. I don't know much about video cards but doesn't looks right to me.

I am thinking to test 3.3v lines too. Just guessing.

The FETs on the VRAM VRM don't read like shorted. They look ok and I saw no shorts there.

I did some measurements on the small smd caps before vCore VRM and some read shorted (but not necessarily they are bad for that I guess). Was thinking to desolder them with station and test outside.

Yes I am probably replacing those R33 inductors preemptively if I manage to make this card work. It wouldn't be that difficult with station since they are relatively big.

You know what kind of measurements I could do there? Maybe a tutorial here at the forum? I saw this youtube video that looks interesting

https://www.youtube.com/watch?v=vHGn2pZ0Cv8

Last edited by waldoalvarez00; 06-01-2021 at 08:41 PM.. Reason: no 5v in pciex
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