My jvc 54' had a magnet drop behind it when we turned it on the color was pulled to the bottom of the screen what can we do please?

A degausing coil may help, Big loop of wire creating a magnetic field. If not television technician, you may not have.
Most TV's, when you turn them on you may "hear?"a surge. That is degaussing circuit.
I would take that magnet, you dropped, move around the front of TV screen, about 2"?
And slowly pull away, within 5 minutes you should find a process that works.
Other wise call local Technician and ask how much to stop by and degauss.
If price out of range, Try maybe an auction site, and search degaussing coil.
Good Luck.