I Love Electricity

Replacement of a bad capacitor in a power supply

I have a 400w PSU that has decided to emit a high pitched ear piercing squeal whenever a GPU load is applied. Upon opening it up, I discovered one capacitor on the secondary side of things is bulging at the top. I will be de-soldering this cap and replacing it:

The bad capacitor

The bad capacitor

Marked the positive and negative with sharpies

Desoldered…looks like it vented a bit around one of the electrodes

Now to find an equivalent microfarad (uF) rating of same or higher voltage…

Must be my lucky day, an exact match in specs, though physically larger.

Soldered on the board, with careful attention paid to polarity

It barely fit, but looks good!

Seems to be working with the tester…real test will come with a full load.