"Nowhere" wrote in message
...
The 12 V DC power polarity to a flatscreen TV was unfortunately reversed

The TV does not now function and I would like to know if anything can
be done to repair it or is all lost

There are basically 2 possibilities:

(1) Maybe it blew a fuse and/or a few components in the power supply and
nothing else.

(2) Or maybe all is lost.

Depends on the power supply circuitry.