Re: Old AT power supply (model: API-3186S) troubleshooring/testing



I took some more pictures of the main PSU board and a little daughterboard it has. I put them in another [URL="https://imgur.com/a/cSmJWgo"]imgur album[/URL].

I know how troubleshooting on ATX PSUs is supposed to work (connect a green wire to any of the black wires, check the various outputs...). But this [I]isn't[/I] and ATX power supply. And as I've said on my post, the general consensus is that AT power supplies are supposed to turn on when you plug them in, but this doesn't...

So... I tore it off a PowerMac 4400/200 that I'm trying to repair. Currently I'm at the stage of eliminating factors that would keep the thing from powering on (RAM is fine, HDD and peripherals are fine, no obvious damage on motherboard).

Problem is, I know precisely nothing about AT-era PSUs and this particular one is an oddball at that. It's got the two auxiliary power connectors that according to schematics online have three +3.3V power lines (and ground obviously) along with a connector that goes to a "SOFT PWR" connector on the motherboard so apparently it's not...

Re: New Members - please post your introductions here

Well here I am, a new member.

Now a few things about me I suppose. I'm Greek. I like to tinker around with random and old tech in my free time. Originally, I was going to start collecting old and obscure tech, but turns out that stuff is hilariously expensive and hard to find in Greece... so here I am.