My TX 81? Panasonic Freesat/Freeview TV works perfectly except when I insert a SDHC card in the slot correctly.
A notice appears on screen to indicate that "Data cannot be read".
I have tried two different SDHC cards with the same result.
SDHc cards work perfectly in a friends tV

Gerry L., October 2010

Try using just the sd card & not the sdhc as the hc stand's for high capacity,,had this trouble with my tomtom would not read sdhc only sd hope this will help you.

Darren, October 2010