Manufacturers recommend LED TVs operate within certain temperature limits. Usually this is between 50° F to 104° F. According to Samsung, their LCD TVs will be negatively affected when used outside this range. In cold weather you may notice that the display becomes sluggish causing the gradual slowing and lagging of response times. 3 Power Source Issue. Unplug your TV from the wall outlet. Plug it into a different, working outlet. 4 Input Settings Issue. Press the input button on your TV remote. Navigate to the input setting Turn off the TV if on and disconnect the power from the TV. Remove the back cover from the TV and then disconnect the cable that goes between the power board and the mainboard. Reconnect the power to the TV and switch on the TV. The TV backlights should come on and stay on. There will be no picture because the mainboard is disconnected. LED TVs are similar to LCD TVs, except for the backlight. Funnily enough, this is also the most common problem in LED TVs. LED TV backlight repair costs $250, parts included. 4K. 4K TVs are generally more affordable than LED and LCDs. It costs $200 to repair the motherboard, backlights, or inverter. Wholesaler of a wide range of products which include Samsung LED TV Backlights, Samsung Led Tv 32 Inch backlight, Samsung's backlight, LG 22 inch EDGE BACKLIGHT, LG 49 inch 46 led edge backlight and Backlight tapes LEDs TVs. Samsung LED TV Backlights. Ask Price. Samsung Led Tv 32 Inch backlight. Ask Price. Main Cause of White Spots or Dots. Fix Problem of White Dots. LCD / LED TV. Fallen reflectors (lenses) inside TV; impact or pressure on the screen surface. Placing the reflector (lenses) on the right spot by using super glue. Plasma TV. Matrix defect. Install the new build blocks. Kinescope TV. If there are a lot of scene changes between light and dark or your room has sudden lighting changes, the TV may appear to be flickering as it adjusts the brightness or darkness. To find this setting, navigate to Settings > General. Look for either Energy Saving or Eco Solution and set the option to Off. 211 posts · Joined 2007. #1 · Jan 1, 2016. This is a thread that addresses the weaknesses in "FULL ARRAY" Back Lighting Units (BLU's) that confirm my concerns about full array LED back lighting and individual/multiple LED back light failures as it relates to PQ. This technology is used in Vizio and other brands. sQfl.