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I'm guessing you meant to say 'power off''. Otherwise it sounds like you have reasonably guessed there may be an electronic malfunction -- but with this, as with any device with a 'chip', I'd suggest first literally 'pulling the plug,' or if it's surge protected powering that down. Give it 30 seconds or so, then power back up. Best of luck!
There is obviously something wrong with the set but the tech didn't catch it giving issues so wasn't able to fix it...I"d start by checking the power supply voltages if your able
Look for 2 pico fuses in the secondary section of the power supply. I'm sure one of them is blown, that is why the 24 volts are missing.
I will let you know the locations later when I get home.
Good Luck.
There is a high power supply failure rate on these LCDs. The power boards are not longer being manufactured or not easy to find.
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