On 12/2/23 14:12, John Dammeyer 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
Spot on John.
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