gdjacobs wrote:

The HD caps are the 4700uF ones. Again, Panny FC, FK, or FM caps, 10V, 4700uF would be excellent.

thank you again! ok so I ordered two of these:

P10236-ND‎
‎EEU-FC1A472L‎
CAP ALUM 4700UF 20% 10V RADIAL

Yup, those will be much closer than the HDs.

gdjacobs wrote:

Yup, those will be much closer than the HDs.

hrm same behavior after swapping those new caps. I'm still scratching my head at this because as far as I know, all I've done since the unit was first received (and worked properly) was replace the large caps, remove the existing wiring harness and solder in new wires for each rail. I suppose something could be screwy with the EVGA modular PCB I'm using (rather with my soldering wires onto it) but it doesn't appear that anything is touching where it shouldn't be, and I triple checked where each of its input legs connected to on the 20 pin ATX connector to make 100% sure I ran each rail to the correct spot.

Again, the +5v standby is working but trying to get the PSU to turn on, a connected fan will be powered for maybe 0.5 to 1 second before shutting off again. I hear a clicking sound in the area of the medium size caps if that means anything (I do not hear this click on the new lower-powered test unit).

Could it be that I simply need to replace ALL the original new caps with different series versions?

I don't think so. Your next step is putting the PSU on a scope to make sure it's regulating properly prior to shutting down.

gdjacobs wrote:

I don't think so. Your next step is putting the PSU on a scope to make sure it's regulating properly prior to shutting down.

I don't currently have access to a scope 🙁

I guess this is a good time to take a look at whether or not the lower capacity unit would be sufficient for the Tyan dual PIII rig since it is still working properly.

As long as it's an earlier design with more than 30A available for 5V circuits, you should be fine. I've used my KP6 dual slot rig with a 365W Enermax supply and a 430W Thermaltake without problems.

gdjacobs wrote:

As long as it's an earlier design with more than 30A available for 5V circuits, you should be fine. I've used my KP6 dual slot rig with a 365W Enermax supply and a 430W Thermaltake without problems.

yep I believe the 5v and 3.3v output is almost identical - with the 600w unit having more amps on its pair of 12v rails.

However... since I also want to use new caps.. I ordered a PSU tester to hopefully figure out what is going on with the original 600w unit as I don't want to just give up.

Thinking over everything I'd done with it... caps were replaced, I broke a leg on a resistor on accident so soldered a jumper wire to the resistor and to the solder pad it was originally attached to, and I noticed on the underside of the board there is a line of very small SMD resistors linking 2 planes, one of which (resistors) is a very very tiny piece that fell off but I'm not sure I resoldered it in the correct orientation because it looks just like a microscopic light brown cube now.

I don't think that tiny resistor would cause this but I'm also no expert by any means.

The PSU tester will be here tomorrow so I'll let you know what kind of readings I see during the power-on blips.