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My tv keeps blinking on and off. How to fix? It's not the power supply

My tv keeps blinking on and off. How to fix? It's not the power supply

My Lg47lb5900 tv keeps blinking on and off. It's not the power supply. Any other suggestions? It's only 2 yrs okd

ANSWERS:

Electronic circuits the tend to draw the most current, will run hotter, and heat degrades electronics, so when shooting trouble, It makes the most sense to start with those item. In LED flat screens, its the LED back light panel.

Com on people power supply is rarely an issue in LCD or LED unit!! I guarantee it it Main board

I just had this problem on and off continuously I took the batterys out both of my remote that are tuned into the TV and it solved the problem

It was the HDMI cable that caused my TV to flicker try replacing it first

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