Antminer U3 used for solo mining - 1/4 chips alive?

[RayBarK]

I have an old little antminer u3 that I use for solo mining in hope of hitting the jackpot, and it's worked pretty well for as long as I've been using it.
So I threw it in storage and wanted to try the jackpot again, but only one of the 4 chip LEDs are lit and I'm getting exactly 1/4 of the 63 GH/s rating.
So the math adds up to 3 of the 4 chips not working and a confused miner holding an old U3.
Any programs I can use to diagnose the chips not working? Or even better, something to help me get them back online...

[unholycactus]

Probably broke during storage, especially if it was working well before.
Could probably use a multimeter to test the hardware, but that won't help you fix it if it's truly broke.

[RayBarK]

I'll try that! However the living chip is the closest chip to the power input that isn't working, making me think there's a problem with the 2.5v tabs at each corner.