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Mostly black screen with very faint LG emblem visible

Mostly black screen with very faint LG emblem visible

An LG 59", less than 3 years (sticker on back says manufactured Sept 2017, model 60UJ6300). It always worked just fine, until one day it would not turn on. The little red power light comes on and seems to respond to the remote, but no picture. Well, I do see a very, very faint "LG" emblem pulsing on and off in the middle of the screen. I tried all the non-tech fixes like disconnecting all peripherals, holding the power button down for a minute, and leaving it disconnected from AC power overnight and longer. I took the back off and carefully disconnected/reconneced all the connectors, and sprayed electrical cleaner on them. I saw no obvious signs of overheating or bulging capacitors. Any ideas?

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