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There are a few things to check first. Like changing the HDMI cable and making sure the energy saver mode is off, but the panel has likely gone bad. I would say 90% of the time when half of the screen is out. It is either the board or the screen on its way out. It is not worth fixing these today due to the low cost to buy a new one. Repairs can be more than a new one due to the labor expense. Now is an excellent time to score a good deal with the holidays, so maybe hunt for a new one. -Al
