Motherboard PCIE Replacement / repair?

Question

Motherboard and CPU

Repair guides and support for motherboards and CPUs.

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Marto @marto48

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crwdns2931729:0crwdne2931729:0: Dzi 17, 2025

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Motherboard PCIE Replacement / repair?

G'day everyone, was given a PC for free yesterday, am having an issue with running the GPU in the top PCIE Slot. It was given to me with the GPU in the bottom PCIE slot and it ran fine, i gave the PC a good clean today and moved the GPU to the top slot to give it more airflow, and I've only had issues since. It will boot windows and randomly black screen and send the fans to max speed. I removed the gpu, inspected the port and pin B1, B2 and B3 are all missing. Is it possible to replace this port? Does anyone know of a reputable shop within Australia to complete this repair? The motherboard is a MSI B450 Gaming Pro Carbon Max Wifi. I have a spare motherboard here with the same shielded PCIE port, but lack the correct tools to be able to remove and replace the port without damaging it. Cheers!

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score 1 · Answer 1 · 2025-04-17T07:49:12-07:00

Hi @marto48

I'm surprised that it even worked in that slot sometimes, as pins B1→B3 are a part of the +12V power supply feeding the slot.

Does the the PCIe slot look damaged/burnt where the pins that are missing are supposed to be?

I'm not certain but I think that this same voltage feed is paralleled to all the PCIe slots' B1→B3 pins on the board i.e. B1 slot 1 = B1 slot 2 = B1 slot 3 etc, so hopefully it is only the pins that have been damaged (and removed) and not that, for that particular slot that the tracks that the pins connect to, have also been damaged.

I can't find a free download for the schematics for the motherboard (if it is a MS-7B85 model - printed on the motherboard) so this can be checked out before you try to get it repaired, so that at least you know what if any extra work may be involved to repair the problem.

Here are two sites where there are downloads but you have to sign up to download them. site 1 (scroll down to Post #2), site 2.

If the board tracks have been damaged as well as the pins removed it may be easier (and cheaper) to add an extra case fan to provide the necessary extra cooling to use the bottom PCIe slot.

Just what I'd check first.

Motherboard and CPU

Motherboard PCIE Replacement / repair?

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