1) Desolder the socket completely.
2) Carefully pry out the socket bedrock from the pins and then desolder damaged pins.

I've never been able to remove individual pins from a socket 3, and I've tried pretty hard on a sacrificial socket. Desolder and replace the whole socket is pretty much your only option here.

I would try cleaning them with some contact cleaner first

Just a point of caution, desoldering and replacing a whole socket is not a trivial task. I wouldn't recommend attempting it unless you have a board heater and hot air station.

I found this operation relatively easy.
A bit surprised by the feedback here.
Take the lid off. Do it carefully because the holders can be brittle. If break something Loctite helps a lot.
Desolder the damaged pins. Make sure you have proper replacements for them.
Sometimes it is possible to simply straighten them, if they are not too damaged.

pshipkov wrote on 2024-01-08, 15:24:

I found this operation relatively easy. A bit surprised by the feedback here. Take the lid off. Do it carefully because the hold […]
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I found this operation relatively easy.
A bit surprised by the feedback here.
Take the lid off. Do it carefully because the holders can be brittle. If break something Loctite helps a lot.
Desolder the damaged pins. Make sure you have proper replacements for them.
Sometimes it is possible to simply straighten them, if they are not too damaged.

I've done exactly that - desoldered the pins and removed the lid of the socket - they still did not come out (and they were 100% desoldered and loose on the bottom I assure you)

That being said, I've done the exact same thing on a socket 370 and they lifted right out. So I think the issue is the socket 3 contact interface is different

They don't look damaged to me.

Do you think they're not making contact correctly with the CPU?

You could test for continuity with the processor in, attaching a wire directly to the CPU pin.

tauro wrote on 2024-01-09, 06:28:

They don't look damaged to me.

Do you think they're not making contact correctly with the CPU?

You could test for continuity with the processor in, attaching a wire directly to the CPU pin.

I cant see any damage either, if anything they look a bit corroded/dirty but nothing that some deox-it wouldn't be able to fix.

I know the first thing I do with these old socket 3 boards is to hit them with a warm bath in some de-min water and a little dish soap, give them a gentle scrub with a soft paint brush and then hit them with ISO and let them dry off for a week or two in a warm spot. Anything that cleaning doesn't get will usually get removed with a little PCB cleaner or Deox-it, never had an issue with this method but I have heard of people throwing boards in the dishwasher on a rinse cycle.

I managed to fix it.
Step 1:
I carefully removed the Socket3 socket with a heat gun from a EXP4044 that had been scrapped due to a leaking battery, and I could see that it had perfect contacts.

Step 2:
Similarly, carefully removing the CPU socket on the HIPPO-15 with a heat gun, and then I cleaned every hole, which was a serious test of my patience.

Finally, I installed the socket to the HIPPO-15, soldered every pin, replaced a few capacitors, cleaned and installed the CPU, memory, graphics card, hard drive, and then turned it on, and it worked!

I've tested Doom and Quake dozens of times, and it's running very stable, with no issues, and it's rock solid.

Test Environment:
AMD x5-133 (40x4 160Mhz)
8MB x2(60ns)
Matrox Millennium II

Doom score 1419, Quake 17.0fps.

Nice job! 👏