Your Samsung TV Keeps Dimming due to the Ambient Light Detection function, a contrast imbalance, or maybe a weak signal. Turn up your brightness setting to 100% or turn the Energy Saving Mode off to help improve the dimness. If that doesn’t work, consult a Samsung TV technician to change out the backlights for $110. If it failed, contact Samsung directly and if the guarantee is still available, an advisor will arrange a repair for you. It's usually a problem with the panel and it could be fixed by installing a new panel, which will take around 15 minutes. I'm having an issue with my un55ru7100fxza TV screen where the right side of the screen is far darker than the rest of the screen, the lower right corner is also darker than the top right corner. I've tried different external devices/sources, ran through the diagnostic options, checked the HDMI cable etc. The problem started yesterday and it is How to run a picture or pixel test for your TV screen. If you suspect there is an issue with your Samsung TV display, you can perform a TV display test to diagnose the issue. Follow the steps below to test your TV screen or if you need to troubleshoot your screen, follow our step by step guide to perform a TV display settings reset. 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. Re: [painner] Samsung LED TV UN39FH5000F Backlight issues [In reply to] Can't Post How I fixed my TV was first I took the screen out so I didn't break it then I tested the led strips I took all the strips out and just put one in the bottom turned the TV on and got a millimetre set it on 20v then tested where the next row of leds would clip in .

samsung led tv backlight issues