Updating the firmware and ensuring power to the TV, and make sure that the cables are plugged in correctly. Unplugging the TV and everything that is attached to the TV for about a few minutes to see if that makes a difference.
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Circuit diagrams of power boards to many popular devices are given. You can fetch this details there.
If you received a good main and t-con, cables and plugs are good, there isn't anything left other than a panel issue. Try unhooking one flat ribbon cable at a time and see if you get half a picture.
Check the disc. The disc could be full or the disc could be the wrong format. The disc could have smudges on the back of it. Clean the disc. Remember, DVD -R can only be recorded one time. If you mess up, you can not record on it again. Once a DVD-R comes out of the tray, it is automatically finalized. You can not add to it. I recommend using DVD+RW. It is user friendly disc.
That is the right amount of voltage the issue is when one or more of the individual LED lights fail, the current changes and the power supply senses it and shuts down.
1 (866) 579-7172
this is Netflix customer support phone number. Basically their are at least 9 way to contact them the link is below. Good luck.
https://gethuman.com/contact/Netflix/more
The panel or the mainboard is bad and is broken for your TV. Or it could be caused by electromagnetic siginal interference from appliances in your house.
First off, a main board will never cause a backlight issue like this, the main either turns them on or it doesn't. The inverter for the backlights on this and a few other LG sets have the current tolerance extremely sensitive, there are 2 supplies driving the backlights, one supply for 4 strips the other for 6 and each is independent where one can work and the other not work. Where did you buy the LED lights? Were they some off brand knock off lamp strips or did you get them from a reputable place like shopjimmy? A gut feeling is you have bad lamps, the power board seldom gives issues on this model, if you get them from shopjimmy have them send you another set. Also it's possible for the lamps to work on a LED tester but not work in the TV, I've seen it many times.
Unfortunately you have encountered a common issue with home television repair. This article explains.
https://www.fixya.com/support/r29790007-repairing_own_television
We do have one television expert here named Larry, and hopefully, he will chime in. I can't find anything on 'blink code 8'. That new board is faulty.