The blinks indicate what part is fualty if your trying to fix this set your self use a serivce manual for blink codes, count the blinks and you will know what board is fualty. usually it is a safety feature with panasonic this happens when a circut if fualty and the board affected is bad. i have the same set i had a similar issue i replaced the affected board and it works excellent now.. find a service manual site it should be available for download, may cost you a few buck but youll be sure what to replace..for parts you can search auction sites and electronic parts sites i would recomend a auction site they sell for a lower price than electronic parts supply site..hope this helps

Usually a seven blink shutdown indicates either a y-sustain or buffer board issue or any combination of the 3 boards. I would recommend calling an authorized service center to fix.