Re: Dell Optiplex 990 psu H240AS-00

Thanks for those replies, very helpful.

Can the psu be switched on, for testing using a resistive load, by connecting to the 4 pin connector (yellow and black wires)?. What connections would be required and can I use a switch or a wire link?

Thanks

Re: Dell Optiplex 990 psu H240AS-00

Hi Folks,

I know this is an old thread but I thought I'd ask anyway.
My 3010 sff psu has recently died, H240AS-00, its done a few thousand hours, with destroyed C52 (680pf ?), R25 (.27), plus smd R55 (22) and smd D53 (T4 Z9) on the rear. The other components look good but the FET might have failed. If I knew the exact diode I would have a go at repair, but I can't id it from the markings, T4 Z9. Can anyone tell me the exact diode to use please?

ps. Does anyone know the purpose of the black foam sheet between...