too high voltage!

[kids]

My PSU ATX 400W generated out voltage too high. It burned out my HDD with (nearly), 17V(for 12V line) and 7V (for 5V line). I checked all part inside and replaced all some bad caps 1000uF-10V,16V. But nothing change! Voltage 's still too high. Please tell me why (?)

(Line 3.3V is nornal)

[linuxguru]

Re: too high voltage!

Check the secondary rectifiers also.

[kids]

Re: too high voltage!

Check the secondary rectifiers also.

You can show me whre? I checked parts from line 12V and 5 V only. I think some registers with wrong value make wrong out voltage but I dont find any bad parts.

[kc8adu]

Re: too high voltage!

replace ALL sencondary caps.
anything that overloads +5 or excessive ripple/noise affects all the other outputs.
3.3 is regulated independent of the others.
after replacing the caps if problem still persists look at the feedback.
thats the opto between the pri/sec of the transformer.give the regulator chip a sample while isolating hot/cold sides.