Re: PSU OK but does not turn on when connected



That is the likely reason. I was trying everything I could without having a spare PSU. I would have been better off opening up the PSU and looking for faults....

Re: PSU OK but does not turn on when connected

I chose that value because the measured resistance at the pins on the board varied from 11K down to 1.7K. Anyway the 1K on one pin at a time was not sufficient load.

Re: PSU OK but does not turn on when connected

Opened up PSU. 5 bad caps. Lesson learned. Checking voltages unloaded not good enough.

Re: PSU OK but does not turn on when connected

Borrowed a power supply and it works. Purchased a higher wattage replacement.

Re: PSU OK but does not turn on when connected

I need to find another PSU.
Forgot to mention. I put a 1K resistor load on each active pin of the PSU, one at a time, to try to create the problem. No affect.

Will post when I try another PSU.

Computer HP Slimline s5000 System NY511AA#A2L
Motherboard MS7525 Ver. 1.0

I received this computer totally dead. Nothing turns on.
When opened it was full of dust/dirt and I cleaned it up.
-First I removed the disc drive, hard disc and all other periferals except my monitor, one at a time, trying to turn on each time. Nothing happened.
-Next I removed the power supply and checked voltages with PSon grounded to com. All voltages OK. Reconnected and noted the power supply does not turn on when ON switch pressed.
-Checked continuity of ON/OFF switch...

Re: New Members - please post your introductions here

Hello, I am a retired electrical engineer now repairing computers as a hobby. I help my friends out and also repair and donate failed computers given to me. I was happy to find this forum which I am sure will be a great help in solving problems that baffle me.