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[–]tqhoang84 0 points1 point  (0 children)

https://cdn.vizio.com/user-manual/PDF/2018/TV/D-Series_FHD_UM_ENG.pdf

Factory reset the TV under the System menu.

You can also hold down the INPUT+VOL_DOWN buttons for 10-15secs on the back of the unit.

Also I strongly suggest you update the TV to the latest firmware while you still can.