The panasonic viera tv has completely lost it's picture. the signal is fine as you can hear the programme very clearly but there is no picture. have tried turning it off at the set etc but nothing seems to be getting the picture back.please help.

replace the main board in which the hdmi connectors are onto

If this does not happen with other devices then I would say try a new video cable. HDMI cables can get very picky. If this happens at anytime then the inverter in TV is going out.

Contact the authorized service center for Panasonic.

It sounds like you have taken the steps to isolate the problem to the TV. it seems to be a bad tuner on the Main board. The no signal displayed indicates the TV is otherwise okay. If you have a DVD player or other source you can connect, and you get a picture, then your TV has a bad tuner for sure.

replace inverter board or power supply

Your Tcon board is failing

Tries tv unplug,replug it back like about an hour later for the tv to do a resetting itself back to the factory setting.Go into the tv menu go to PICTURE to go down to do a resetting to the tv Tuner signal board.Tries scanning for channels again.The tv should be work again,if it still have the same result.The tv main board,the tv Tuner signal board is bad.Can u do some mechanicals work like take things aparts and putting it back together again?Yes?Try website like Ebay.com to buy a whole refurbish tv Tuner signal board for the replacement.

HOW MANY TIMES DOES IT BLINK

There may be an auto level option in the TV for sound.

Some sets detect louder signals and change automatically

your HDMI output is bad