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Jon Elson[_3_]

wrote:

The problem with the amp is that
it will not work until it's warm enough. So some device or devices
must be a minimum temperature before the amp will work.

Very likely there is a bad connection, either a solder joint on a
component or a connector. Look over all the solder joints and
see if you can find one that is cracked. You may need to use a jeweler's
loupe or other magnifier to find it. It would be best to find this by
inspection, but if you can't, you can try to find it by applying force to
the board while running. (Of course, watch out for the high voltages!)

Otherwise, if there are plug-in boards or modules, check the connectors
there for dirt or corrosion.

It obviously is not a totally failed component or it wouldn't work
at all. While it is possible there is a temperature-sensitive component,
that kind of thing is fairly rare, and usually they fail when hot, not
cold.

Jon