No surge protector will save your TV or AVR. I have seen cases where they have been saved but that is only through the power cord, but even that is rare because there is so much energy behind the lightning that you can't stop it all. If it comes about as a result of induction into nearby wires your HDMI input or other devices are usually fried.
With regards to the A board you need to match the TNPA/TNPH number and suffix e.g. AB before ordering the board.