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Samsung TV flickering and has backlight issues. what could it be?

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.

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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.

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Thank you so much. So you do not think it is the LCD panel itself, or the backlights? Also, if i already replaced the main board, Is it safe to say it is the SMPs since you believe it is either that or the main board/tcon board? I dont have a voltage meter unfortunetely. This is my second time attempting to repair a tv but i could get one if you think it will be helpful.

par

Does anybody have an idea of whats going? could it be the panel itself?

par

No this would not be a back light issue or the LCD, if you follow the test above it will help you figure out which board it is.

par

Thank you again Brent! I will do the test tomorrow.

par

Just checking to see what you found out about this.

par

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sebastien sera éternellement reconnaissant.
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