TV has sound no picture

TV has sound no picture

I have a Panasonic vierra tx-37lzd81 lcd tv my wife was watching the tv next minute there was sound but no picture,I’ve turned it on & off thats fine the green light comes on too after about 10 flashes[maybe a few more as very fast] still no picture any idea’s please? with the back cover off there’s a white light on the rear of the screen..I was told it could be the TCON board so changed that still the same great sound no picture

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