Dark spot on led tv

There is no way to know for sure without taking it apart, but chances are its bad lamp strips, I'd say 9 out of 10 chance of lamps

A Vizio TV will flicker if there is a broken backlight, loose or faulty video cable or port, poor signal strength or incompatible display settings. Reseat all cable and connections to the television from your devices. Physically remove the cables from both the television and the device and reconnect them. If you have any of these options available please turn all of them off to see if this resolves the display flickering. lickering and shorted leds causing dark spots are both symptoms of bad leds. You can try turning down the backlight level and see if the flickering stops. The ultimate solution may be to replace the LED strips.

Replace the LED back lights strips.

Certainly not the TCON board.

The following picture symptoms indicate a bad LCD panel, and NOT a bad back light or board:
-One side of the picture is darker than the other
-Picture has horizontal line(s)
-A dark, cloudy spot spreads across the picture

Hi Brandon,
I am afraid that the dark spot in the screen is not repairable. Manage as long as you can or go for a new tv.

With a DLP TV, getting a darker picture means it is time to change the bulb.

You could possibly be dealing with a failing LCD panel. I've seen many of the dark spots in Samsung sets and it's due to defective LCD panel tabs. The only true fix is the replace the panel which would cost more than a new TV !!!

This sounds like a speaker got too close to the TV.
Degauss is built into many tv's check for it in the menu.
Otherwise, yes a TV shop or yourself will need to degauss the TV.

Is this a DLP or a conventional 3 tube projection tv?