my fisher tv comes on when i power it up and goes off in a few seconds and will not power up again for a few m

Answer 1

you most likely have a shorted or leaky component in the television dragging a voltage down triggering it to go into protect mode in which it shutsdown. Without a make and model we really can't help you.

Answer 2

We should be gratefull that neuro surgeons don`t try to tell people how to DIY neuro surgery !!