Ok I screwed up big time and hoping I can fix. I will break down what happened and the images.
I went to the computer right away looked at a blog post and saw that only one end (with the four yellows on clip side) goes to GPU and other to board. The listing I bought from did not state that so I didnt know. So I screwed it up, bad.
The computer sees its a P40 but the driver won't initialize it. I believe that is because the board is getting power through the slot and that is enough to tell it what it is through PEX/bios but the rest of the card isn't getting the power it needs from one of the VRMs so the driver can't initialize it.
I can soldier on a new inductor. Im hoping thats all it is. Could there be something under the inductor? Can any one help me diagnose the VRMs further to make sure nothing else is damaged? Please.
TL;DR I put power in backwards polarity to this card twice. Im an idiot.
- Have Dell PowerEdge R730
- Bought Tesla P40
- Researched power cables and order correct one, pic had two black connectors in photos
- Power cable arrived, same connectors (EPS-12v) on both ends
Both sides are the same plug but different colors. The listing stated that colors would be random. OK I plug it in, red side to riser board, black side to GPU. - Power on.
- System immediately turns off.
- I only had 1 PSU plugged in and it was blinking orange, I thought I drew too much so I plugged in the other PSU and turned it back on again.
- Immediately turned off again but that oh-so-familiar smell.
I went to the computer right away looked at a blog post and saw that only one end (with the four yellows on clip side) goes to GPU and other to board. The listing I bought from did not state that so I didnt know. So I screwed it up, bad.
- I put the power cable on the right way and then turned it on and the computer would see the card but nvidia-smi wouldnt detect any cards. ChatGPT said to try and older driver, we did, no go. Then it said that the card may be damaged and is powering it enough through the pci power to ID itself but something else isnt right.
- I disassembled it
- Visual inspection didn't show anything
- Sniff test brought me to this one 1R0 inductor, its the only source of burnt I can find
- I tested the four grounds and all of them were ok except the one noted in the photo, it shows OL, not sure if it should or not. Circuit is only closed to a couple pads opposite the inductor which smelled.
- I watched the entire Learn Electronics Repair GPU Step by Step fault finding to no avail.
- Have requested the schematic here (unable to find via search)
The computer sees its a P40 but the driver won't initialize it. I believe that is because the board is getting power through the slot and that is enough to tell it what it is through PEX/bios but the rest of the card isn't getting the power it needs from one of the VRMs so the driver can't initialize it.
I can soldier on a new inductor. Im hoping thats all it is. Could there be something under the inductor? Can any one help me diagnose the VRMs further to make sure nothing else is damaged? Please.
TL;DR I put power in backwards polarity to this card twice. Im an idiot.
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