Jerry G. wrote:
This can be anything that you did. You may have bridged some traces or
connections, or didn't properly solder some of them. If you made any
bridged connnections or created a critical opened connection, there is
a chance that some other components have been damaged.

It could be none of the above. He may have disturbed a loose connection
which was in a totally different area. Excellent advice below:

If you are not experienced at TV servicing, your best bet would have
to bring the set in to a service center to have it serviced in the
first place. The repair may have not been too expensive to start with.
Jerry G.
======
jak