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Its likely the power supply. They are notorious for problems. The backlight is powered in quadrants. Your lower left quadrant is failing. I love fixing things but Vizio is nothing but trouble. I wont even work on them they are so poor to repair.
If you are handy, check the power supply for the backlight for bad solder. If it looks ok, then Id use it until it goes bad again.
Hi Tala,
I appreciate your DIY approach, but the job is very delicate, risky and needs high level of proficiency. The screen is lit by several strips of LEDs. In your case probably the middle row of LEDs has failed. You have to open apart the LCD module to find out what kind of LED strips they have used and there is every chance of damaging the delicate LCD screen or the SHEET as they call it. Better hand over the job to someone who can do it.
Good luck.
Check the attached links,
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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 trouble shoot. Contact any service technician. The circuit will differ with models and versions.
Measure all the voltages coming off the power supply board first. Then move to the board that controls the picture. This board has one or two wide flat flexible cables running form it to the bottom of the screen. TV Parts Universal TV Stands DLP Chips ShopJimmy You can get all the parts you need here.
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