Walter,
Strictly from what I'm reading it sounds to me that your PCB has failed, or is failing. You will need to either;
1) Find your specific PCB (There will be a model number on the board itself) and order a replacement online, then install it on your own.
2) If you are not comfortable repairing it on your own, contact a local electronic repair shop and describe the problem as you've described it here and they will be able to further assist you.
Attached you will find an image of a common PCB layout.
Hope this helps,
Best regards.
https://www.ifixit.com/Device/Electronics TV Parts LCD TV Parts Plasma TV Parts TV Repair ShopJimmy https://www.youtube.com/watch?v=mL9nxYvf4NM&t=3s https://www.ebay.com/p/LG-70lb7100-uc-Power-Supply-Board-EAY63072301/10024317904?iid=273742970767&chn=ps
SOURCE: lcd tv backlight prob
You need to replace the inverter board if you can find the spare part. Otherwise you need to replace the whole lcd panel.
SOURCE: Sony KDL-46s2010 4 red light blinks
I would suspect one or more of the miniature flourescent backlight lamps. One way to confirm this would be to power up the set with a grayscale image at 40 to 60 IRE. If one or more lamps is failing to light, a slightly darker horizontal area in the grayscale will give it away. Unfortunately, Sony will not supply any of the backlight components apart from a new LCD panel. Sorry.
SOURCE: screen goes black but still sound
This is inverter or backlighting problem. Can you try switching it on and off quickly for a couple of times and tell me if these '2 seconds' get any longer'. If picture stays longer and longer before shutting down, one lamp needs replaced-if not, please replace inverter board
Depending on your electronics skill, they can be replaced with new replacement boards. Usually the inverter boards that drive the backlights tend to blow. Soo its not really an expertise repair unless you know what your doing. The lcd tv's ive fixed the backlights are all on a 2 pin connector.
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