PrecisionmachinisT wrote:

"Karl Townsend" wrote in message
...

Leaving it on all the time helps too.

Indicates possible thermal expansion of a solder joint or
component...oftentimes, you can poke around with toothpick or something to
locate the culprit.

Beware of switching power supplies, they can produce a fairly nasty shock.

Hairline thermal stress solder fractures around component leads are
fairly common. Back when I helped a friend at his repair business any
Sony receivers that came in for repair automatically got a manual
resolder at all points (heat and add a bit of fresh solder) as that was
by far the most common failure. If you looked under a good magnifier you
could see the circular fracture around the component leads.