How much will it cost to fix a HDMI port on a Panasonic tv you blew the port?

Oh dear. Very careless.

The first thing to try is to see if the dealer or manufacturer will offer a warranty repair. Panasonic have been known to undertake a repair free of charge for products that are out of their warranty period.

If that doesn't work, the other option is to have it repaired by a qualified technician. Production techniques for televisions are such that it is almost impossible for a user to make repairs. The repair cost could be very low if it is only a component or two that need to be replaced. On the other hand, it might prove expensive if a complete circuit board has to be replaced.