On 12/21/2014 10:11 AM, Marek Drvota wrote:
Hi all,
finally I was able to clean up my newly acquired Mac IIfx just to realize that
it won’t start.
I’d like to check whether power supply or logic board failed - do any of you
know how to check if powersupply is ok or not ?
Look at all the capacitors, the small parts that are shaped like little
cans with a plastic wrap.
On top you'll see pressed in lines forming an X or K. The tops should be
flat, no dome or bulging and especially no splitting with goo oozing out.
If you have any bulged or split capacitors, you should replace all of
them on the logic board. Open up the power supply and check its
capacitors too.
If you aren't up to recapping your IIfx, there are list members who do
it for a reasonable fee.
The worst that can happen from leaking caps is the electrolyte leaks
around the base, onto the PCB and corrodes through some of the traces.
Top layer traces can often be repaired using a jumper wire. If the
damage is deep, into one of the inner layers, the only way to fix it is
if the damaged trace connects to a nearby via that comes to the top so a
jumper can be soldered.
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