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Hi, I'm Nathan.
Sorry to hear that you're having trouble with this but I'll do my best to help you.
Does this happen on all sources/inputs?Does it affect the LG menu screens also?If you hold a flashlight to the screen (while dark) can you see the image better that way?
Thank you for confirming.
Do you ever see any lines (vertical or horizontal) among the picture, or is the picture quality always good and clear, with the exception of the brightness?
Okay that can come from the internal power supply, which drives the led backlighting,
if you've had a tech out already, he should have checked that though, and if he did and found no problem with it, it would then leave a fault in the led strips, which are inside the screen. That is likely what he meant about the screen being faulty. The boards can be replaced, the actual led array is a different story and generally not feasible to repair. It would cost more to fix it than it would to buy a new tv. It wouldn't hurt to have another tech out for a 2nd opinion if you didn't trust the first guy, but if the board was bad he would have no reason to tell you otherwise as he isn't making a living by not repairing it and selling you the parts.
Best regards, ***** ***** for the news,
I certainly understand how frustrating that type of issue can be especially when it is intermittent. When you are saying football works but GOT doesn't, are these coming from different inputs/sources? Ie: aerial/cable versus roku/streaming/etc?
Thanks for confirming. Happening on the internal menus does still confirm it is an LG fault though, and does bring us back to a repair/replacement decision.
I can try to help you find another tech to check it out if you'd like, but it does sound like a panel/led issue at this point, so having another person out will only incur more diagnostic fees.
Do you need more help with this?