Samsung Tv Flickering And Has Backlight Issues What Could It Be Samsung Television

Chosen Solution

I got this tv today the image flashes/flickers. it is a un65ks850df. it starts flickering after about 20 minutes or so of use. also it has a second problem that starts right when i turn it on. the backlight goes from high to low ( not gradually) every 30 seconds or so and it wont allow me to change the backlight level in the settings. however i am able to change the brightness and sharpness and contrast, just not the backlight. we sent it to a repair shop and he replaced the main board but it still does the same thing. This is a video of the tv flickering ( the most annoying problem). it goes away sometimes and comes back after a while. Please let me know what it could be. thank you https://www.youtube.com/watch?v=zoIB7sGp… this is a link of the flickering. SHOW LESS

Go to Menu , Picture, Backlight and vary level (0 – 20) • If no backlight changes observed: Check Panel Connector minus (-) pin voltages and P-DIM voltages while changing backlight level. • If minus Panel voltages don’t change, and P-DIM changes, replace SMPS. • If P-DIM doesn’t change replace Main/T-CON Board. MUTE 4 1 9 EXIT to test Panel Backlight Sections.