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LGA1155 motherboard - no USB ports work (lemmy.ml)
submitted 9 months ago by to c/askelectronics@discuss.tchncs.de
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trying to save an old motherboard, it's a Gigabyte GA-B75M-D2V. tried searching, got nothing usable back.

problem: no USB ports work - all the ones on the back, both USB 2.0 and 3.0, and all front ports. USB ports not working is common accross boards and manufacturers, but it's usually a subset, some work some don't and you can still use the thing.

ports have 5V, when the keyboard gets connected its leds light up for a second but don't stay on. the mouse's led doesn't light up when connected. neither are detected by the UEFI setup.

I got a PCI-Express USB 3.0 card, but that thing doesn't work for booting off of it or in UEFI setup, etc., only after boot from HDD.

otherwise, everything works - LAN, sound, audio, SATA, etc. I feel the platform still has a lot of life left, especially for my use cases.

this is not a software or settings issue, that's why I'm in "ask electronics" something is fried here and was looking for pointers what or where to look at.

no visible burns or busted caps and such. hoping it's something simple, any ideas what to look at?

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[–] 5 points 9 months ago (3 children)

Did this happen over time or suddenly all ports dead? Or maybe this is new to you and unknown.

I would try clearing the CMOS is you haven't already. Unplug power, remove the CMOS battery and wait a minute or more (or short the + and - contacts for a few seconds).

If that doesn't change things, maybe inspect the CPU. Any problems visible on its contacts or the socket?

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  • [–] [S] 2 points 9 months ago (2 children)

    got the board for free, it had those issues with the dude's CPU, it has it with mine too, socket looked OK, no bent pins I can see. isn't a settings or software issue, tried all that.

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  • [–] 5 points 9 months ago (1 child)

    Just to make sure - you physically drained the CMOS to reset it, right? That can have different results vs resetting to defaults in the BIOS/UEFI interface.

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  • [–] [S] 1 point 9 months ago

    yes, I know what a CMOS reset is, comes up, says settings are wiped, you want defaults, etc., no change. got a USB to PS2 adapter and I can move around the setup, tried everything and then some.

    it hasn't anything to do with settings, something got fried here and was looking for pointers what to look at.

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