19 Dec
2019
19 Dec
'19
10:48 p.m.
On Thu, Dec 19, 2019 at 10:04:09AM -0800, Len Ovens wrote:
The most likely thig to be wrong is a capacitor. With
the i/o box open find
a larger cap probably close to where the power comes in and after warm up
try spraying this with some kind of "freeze spray" to see if the problem
comes back. replace tha cap that when chilled causes the probalem to come
back. Probably replace the power supply cap just because... (higher value is
ok)
If this is a faulty cap (and it may very well be), then cooling it
isn't going to help. Look for traces of leakage. If there is any,
replace the cap.
There's a lot of HW that uses switched PS today, which means some
caps will be on the 'hot' (i.e. mains voltage) side. Trying to fix
those is not something I'd advise, unless you know very well what
you are doing. Better replace the whole thing.
There may be other causes for this sort of problem, e.g. bad ground
connections due to corrosion.
Good luck,
--
FA