Author Topic: P2/P3 Motherboard standby power issue  (Read 96 times)

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Offline spilihpsTopic starter

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P2/P3 Motherboard standby power issue
« on: March 23, 2024, 05:27:27 pm »
Hello,

Pulled out a P3 rig from storage to play around with. Noticed that as soon as PSU is connected power "leaks" in standby, causing CPU and GPU fan to run for example.
Power LED in front is also lit, but very dim. Likewise using a postcard the power indication LEDs on that is also lit, but very dim

Checked the PSU, and it is not providing anything more than the +5VSB as it should.

System power on and works as normal.

To me it seems like the VSB on the motherboard is leaking to other rails for some reason. I did not want to keep it plugged in more than necessary with this issue.

Any tips or hints what might be the cause, or what to check?

The motherboard model is unknown, it only has "INTEL BX-B" written on it. Its one of these built to order boards from late 90s.

I actually have two of these boards, one that failed in a worse way, but it was saved in this thread: https://www.eevblog.com/forum/repair/broken-ic-on-old-pentium-2-motherboard/  :D

I attach a image of the board for identification.

« Last Edit: March 23, 2024, 10:27:50 pm by spilihps »
 


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