lg tv 55 inch going blank while watching

[Abednego_1]

My 4years LED lg 55 inch had same problem of flashing and going blank afterwards though there is a sound. I sent it for repairs and they fixed back light and power supply later. Its doing it again. What could be the issue here? Can anyone please help

 

[jsmithepa]

Turn off all green/power saving/eco features. Use another cable.