Cleaning and Restoring a Badly Corroded PSU

Rob Jarratt robert.jarratt at
Wed Oct 25 16:15:35 CDT 2017

Thanks for the suggestions. I will have to desolder the heatsinks from the board though, and then I can try a good clean up as suggested. I know about those RIFAs, the H7878 had one but it seemed still OK and this one looks to be in good condition, do they show signs of cracking before they go?



> -----Original Message-----
> From: cctalk [mailto:cctalk-bounces at] On Behalf Of shadoooo
> via cctalk
> Sent: 25 October 2017 21:06
> To: cctalk <cctalk at>
> Subject: RE: Cleaning and Restoring a Badly Corroded PSU
> Hello,
> the vertical heat sinks for the TO220 with this design are fairly common, I saw
> them many times on various boards.
> However, as they are simply aluminum parts, you can clean them for sure.
> After removing the screw, you could try simply with an hard brush.
> If badly corroded, remove the bubbles of oxide with a thin sanding paper, then
> you could restore the opaque aspect submerging for few seconds in caustic
> sodium solution. Be aware to protect eyes and skin!
> Replace the RIFA X2 capacitor!!!!
> Andrea

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