I have a Samsung 55 inch TV that has a constant backlight flicker with no image on the screen. It shows a black picture and the light flickers off and on and nothing more. I've pinned the problem down to the main board and I can get the tv to work again by using a heat gun or hair dryer on the main board itself. What would cause the backlight to constantly flicker like this and applying heat to the board itself make the image work properly?
Disable the Eco Sensor feature. Locate this setting under “Settings” in the main menu. Turning the Eco Sensor off disables the automatic ambient light brightness adjustment, which can be a source of flickering.
Disable the Energy Saving feature. Locate this setting under “Settings” in the main menu. Turn Energy Saving off to prevent your Samsung TV from automatically adjusting brightness based on the show you are watching. This may solve your flickering problem.
Test your Samsung TV on a different source if flickering persists. The issue could be caused by a faulty cable, bad connection or malfunctioning receiver or Blu-ray player.
Eco Sensor is off and energy saving feature is off as well. Source of the tv doesn't matter, once you hit the power button the tv turns on to a black screen with the backlight flickering from off to on and this repeats. However, if i open the tv up and blow hot air ( Hair Blow Dryer) onto the main board and then reseal the tv everything will work as normal. This is a known issue to the main board and a google search reports this issue everywhere but no solution. I have ordered new thermal paste for the cpu/gpu due to the current paste being hard as a rock but again once I apply heat to the board itself the problem goes away. This is not a feature issue due to everything already being off.