computergeek92 wrote:

They have new AT PSUs online. Are AT PSUs easy to test for faults and if an AT PSU dies will it fry the rest of the system?

I'd treat most none referbed AT psu and old stock at psu's like alow end atx unit.
As for testing for faults that would be no different then a atx psu aside form the different cables and how they power on.

So like you were saying, A brand new AT psu would be the same in quality as a low end ATX psu in quality and fault tolerance? Tell you what, if I check for bad caps every year and do psu tests, I should be good? Are there any AT psu testers still around that can give thorough diagnostics?

computergeek92 wrote:

So like you were saying, A brand new AT psu would be the same in quality as a low end ATX psu in quality and fault tolerance? Tell you what, if I check for bad caps every year and do psu tests, I should be good? Are there any AT psu testers still around that can give thorough diagnostics?

NOS AT units can have bad caps. that was what I getting at.
as for fault tolerance, there is none with only one psu AT or ATX. A for testing a good multi meter will work. unless if you want to test for ripple

I was asking if the old AT psus lack short circuit protection. I read that good quality modern psus just die rather than take the rest of the system with it.

It really depends on the psu. Some might have it some might not.