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The screen and the LCD are broken and are going bad and should be replaced for your TV and the ribbon might also be damaged too and needing to be replaced.
The model and serial numbers can be found on a label in one of three locations: On the bottom of the control panel above the door, on the front of the oven cavity below the control panel, or on the inside of the left side panel, which can be seen by removing the left front grate and burner bowl.May 21, 2015
The first thing to do is to go into settings and Reset Picture Settings. If that doesn't fix it, you will need to take it to a repair shop for diagnosis and repair.
You did not give a model number for this. But I will say this. I have three of these in my shop. There are no parts available for them....and they are not likely to be found. I bet your TV is right at 5 or 6 years. Thanks for asking, Matt of Martins TV Repair.
Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electronicshelponline.blogspot.com/
In some models of LCD TVS; the backlight inverter and its T'Con board will be a part of the panel itself, and will be a built-in type inside the LCD panel. If so, they can't be replaced. In this case; a panel replacement is the only repair. For some other models, the backlight inverter section circuit will be a part of the main power supply regulator [SMPS]. To such sets, the power supply section circuit too should be troubles hooted. Contact any service technician. The circuit will differ with models and versions.
Type in the brand name of your device, in the search box [at the top right] of the display window and the Search will start at once as you type in, and will show you all the related posts. It will make surf easy.
I'm not familiar with your specific model, but are the units LCD or DLP? What I've seen in LCD projectors used in schools, museums, etc. that are left-on for several hours per-day, is that the UV filters in the optical blocks will fail. They usually change to an amber-brown color and block most of the light. It's the equivalent to putting sunglasses on. Do the units also exhibit a greenish-yellow tint instead of proper color?
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