Cleaning and Restoring a Badly Corroded PSU

[Maciej W. Rozycki]

On Sat, 28 Oct 2017, Maciej W. Rozycki wrote:

> > Did you manage to remove this part without destroying it and without
> > damaging the board?
> 
>  Yes, in all cases.  I didn't recall any issues with unsoldering this part 
> really, using a simple 40W iron and desoldering wick only, and extra flux 
> from a pen.

 On second thoughts if solder has corroded, which may well be the case 
given the overall state of your PSU, then you will have troubles melting 
it, because, obviously, oxides and other compounds which would have formed 
won't usually melt as easily as metal.  In that case I suggest trying 
mechanical means to remove the contamination and then applying extra 
solder to increase its mass in the joint before trying to undo it.

 I do remember having problems with handling corroded joints next to 
leaked capacitors in my H7874 PSUs, even though those specific joints 
didn't have any way to lose heat easily.

 HTH,

  Maciej