My Maxent turns off when it comes back on it has dark colors.
This has been happening more often. I can be watching TV and then the screen shuts off and cycles thru AV1 and Av2 and the turns off, then seconds later it comes back on. This cycle takes about 20-30 seconds. But when it comes back on the screen colors are all dark, mostely red. Then maybe 10 seconds later it will turn off again and go back to normal settings.
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Faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.
I had the same issue....thankfully, I had purchased an extended warranty from Best Buy...I had been in a panic, because I NEVER thought I would pay a grand for a tv, but I LOVE it...anyway.....I had the "Geek Squad" come to look at the tv....the tech took 30 secs....there is a problem with your Y-SUS (Y-sustain board)...it will need to be replaced...and...the tech called another tech, and he advised that the Z-SUS be replaced as well (apparently he had to go back to the same home after a Y-SUS replacement to change out a failed Z-SuS).....retail on Y-SUS is about $300...ebay has them for less than half that, if you think you can do it yourself...keep in mind that "Maxent" is a Zenith/LG product, so finding parts might be a challenge if you base it upon Maxent....hope this helps!!
Artifacts can be seen on some screens that are trying to present high def color but cannot support the full dynamic color range. You will see this as banding or clustering in people's faces. Some brands handle this much better than others, and less expensive TVs can handle this rather poorly.
In your case, you may find that HD channels look worse than the regular signal channels.