Hi, may I have the model # ***** the device you are having this trouble with?
I will switch us to Q & A since no response from you yet;-)
50 inch smart fhd fvhd avtv003398
what happens know still none the wiser
the set is 6-7 months old picture is dark ajusting the contrast,brightness does not alter anything the led backlight seems to be flashing even on dvd playback