On 12/3/23 04:42, Roland Jollivet wrote:
If you can obtain/borrow any thermal imaging device, then run with the PSU
with covers off and check every 5min. You should identify a cap-thermal
problem.
For that, a $500 ir imager would be nice, but a $29 ir thermometer from
the local lumber yard can do as well. Leonardo might even have one of
those in his toolbox, if only to check his food for adequate cooking. I
do. When I'm on the road, living out of the fridge and microwave of a
motel room.
On Sat, 2 Dec 2023 at 21:14, John Dammeyer <jo...@autoartisans.com> wrote:
From: Chris Albertson [mailto:albertson.ch...@gmail.com]
If it is a simple linear power supply, yes they are very easy to debug
and
repair, LIkey it is the caps.
But switching power supplies are much harder to debug, You can guess it
might be the same issue but these have dozens of parts that can fail..
In any
case, the cost to repair is small.
I disagree. Switching power supplies are way more likely to fail from
high ESR. That the system runs for a short while and then fails is again a
symptom of a capacitor overheating due to high ESR. Or the voltage is
right on the edge and as the cap warms up the heat results in a change that
results in the power supply moving out of spec. There may even be enough
heat developed on the board that a solder joint becomes unreliable.
In the past even PC motherboards have been repaired by a wholesale swap of
the electrolytics.
So what I would do is an initial survey of the electrolytic capacitors
inside the power supply and order a set. That way the machine can still
run for an hour or so a day while you wait for parts from a reputable
source. Then replace the capacitor when they arrive. That won't prevent
the power supply from working again and it may well fix the 1 to 2 hour
failure period. In either case $30 or so worth of caps is cheap.
John
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Cheers, Gene Heskett.
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