How old is the rest of your gear and what source are you watching? You could be having EDID and/or HDCP handshake issues with your system if the gear is older and you are trying to watch new programming. If you are using an AVR in your setup, could also be the HDMI board in the AVR is failing.

On the other hand, prices have dropped so much in the last year or so you might just replace it. I have an old "dumb" Samsung 55" and a new smart TCL 4K 55". The new one is much better, better connectivity, etc and was 1/5th of the cost of the Samsung.

Hi CJ FIREFIGHTER,

It depends on what other symptoms that you may be getting on your TV. When you say that the screen keeps flipping between picture and a black screen, are you still getting back light? (Meaning, is the TV still turned on?) Here's a simple test: when your TV starts flipping between picture and black screen-->tap on the screen very gently with your index finger to see if there is still back lighting. If there is back lighting, this could be an issue with your main board (this is the circuit board with your HDMI, A/V IO, etc) or the tuner board (if it is separate from the main board).

If you're not getting back lighting, do you still hear sound when it flips between picture and black screen? In particular, are you getting sound from the black screen? If you are getting sound from the black screen, it could be the LED Driver starting to go bad or the TV panel itself.

If you're not getting sound when it flips from picture to black screen, it could be your main board. Here's a simple test: try connecting the A/V cable to an external speaker to see if the audio works via an external speaker system. If it works, then it could be your coaxial cable that connects to the tuner on your TV, the port that you are connecting it to, or the signal itself.

If you have a laptop or desktop with USB-to-Tuner card installed, try connecting the coaxial cable to your laptop or desktop to see if it does the same thing: flip between picture and black screen. If it does, then switch out the coaxial cable with a new one and try again. If it still persists, you can safely rule out your laptop/desktop and TV being the problem. If not, and the symptoms only appear on your TV, then it's most likely the main board. To a lesser extent, depending on the model of your LG TV, it may be that the power supply may not be giving the main board enough electrical current to keep the signal consistent--hence the same symptoms occur.

Main boards and power supplies are typically expensive and can be hard to find. LG and other TV Manufacturer don't typically sell their circuit boards to the general public directly. You'll have to find alternative sources like ShopJimmy.com or TVPartsGuy.com.

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