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Resetting your TV should make your TV create a new Facebook token. This token should then be entered on your computer at www.facebook.com/device.
A tutorial on how to reset your TV can be found at http://shop.panasonic.com/docs/how-to/2013/tv/reset-procedure/How_to_Reset_your_Panasonic_Viera.html
A tutorial on how to register Facebook can be found at http://shop.panasonic.com/docs/how-to/2013/tv/register-facebook/2013_How_to_Register_Facebook.html
See if leaving it unplugged overnight would reset it and solve the issue. If it does not you may have leaking capacitors on its power supply circuit or burnt parts or solders that may have gone loose.
This happened to me today on a 42 inch Panasonic Plasma... Just shut off suddenly. Turns out is was my cable box - I reset my digital cable box (unplugged and restarted) - then the sound was back on.
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