>Left it on the car dash once and when I came back, the unit
>was really hot, and the display was completely black.
>it came back after it cooled off.  And this happened many times

I had a LCD clock that I left on the dash that did that.  It
worked after it cooled.

Now for my question:  I've had a few LCD clocks that refused
to work after I replaced the battery.  My guess here is that
when the battery goes dead the internal circuits stop
oscillating, putting DC on the display, ruining
it for the next go.   Believable?

Barry

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