This is definitely an issue with the main Audio/video board of the tv. Replacing the same should resolve the problem. Replacement board costs about 100-125$. let me know if you wish to do it yourself so that I can give you the instructions
\015\012This kind of symptoms indicated of malfunction either on the power supply board, A board, and/or the D board inside.\015\012
\015\012First, lets isolate loose connection from internal cable connectors of the said board. Pull-out all the connectors from this board, inspect and then re-insert and ensure that they are properly seat-in.\015\012
\015\012I've read your comment and you have said that there is no blinking led light in the front panel, this only indicated that the power supply board has no problem.\015\012
\015\012The fault is between the A board and/or the D board alone. \015\012
\015\012A board - process the all Audio/video input of the unit included the HDMI interface, control the A/V switch, process the speaker out and the microcontroller in the front panel of the unit.\015\012
\015\012D board - process the video out from the A board and feed to sustain boards and date driver of the panel. \015\012
\015\012Since you have no sound and video, this is only shows that the A board was already faulty. This board has a surface mounted IC's and can't troubleshoot without special tools and test instrument. I would advice you to send it to your local Panasonic Service Center. \015\012
\015\012You may also replaced the entire A-board, you may place your order online, try the LINK below.\015\012
\015\012Let me know if you need further assistance.\015\012
\015\012Also, don't forget to check if the unit is still under warranty/extended warranty period, avail it because the manufacturer will fix it for free. Don't attempt to open the back cover because it will void the warranty.\015\012
\015\012Hope I helped you.\015\012
\015\012Have a nice day!\015\012
\015\012Thanks for using Fixya.\015\012
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