What is causing my screen to flicker?

My LG 55LB5900 screen is flickering when its powered on. I've attempted to clean the ribbon cable once and worked fine for 2 weeks then started flickering or blinking again. Can someone explain what's going on here?

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Same exact issue also

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I have another thread you can take a look at about this same issue, only I've replaced the LED strips and still flickering so I'm replacing the power board in a week...

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Same exact TV and issue as this thread. Hope this helps you!

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