Samsung 6350 smart tv is stuck in closed captioning. tried everything to turn off cc

This is called Closed Captioning.
Go to the menu via the TV remote control and find the CC options and disable that feature.

According to the Samsung support website there is an option in the menu which is called "caption" which can be selected off or on.

This is a link to a copy of the manual.

Samsung UN65F6300AF manual

In the manual it says to select the onscreen menu and then ...

Subtitles

Screen Menu > Broadcasting > Caption Try Now

View subtitles along with subtitle-enabled digital and analog broadcasts.

Show Subtitles

Screen Menu > Broadcasting > Caption > Caption Try Now

Show subtitles. Subtitles will be displayed when you choose a broadcast that supports subtitles.
"" DVD Subtitles are only available when connected to an external input connector.

Using the TV remote. Enter the setup menu for the TV. Choose Acessibility Options.

If Closed Captioning is being displayed even though the CC option in the TV menu is set to Off , then it is being produced by another device, such as a cable or satellite set-top box. To remove the Closed Captioning from the TV screen, it must be disabled on the device that is decoding the Closed Captioned signal.
NOTE: Some set-top boxes may automatically display Closed Captioning on the TV screen when the set-top box sound is muted. If this is the case, turn off the Mute function of the set-top box

Should be a button labels CC. its in closed captioning mode. Need to turn that off.

cc on remote ?

the closed caption is not in the menu, it is in the video adjustments color,bright,sharp,ect. get to those adjustments and scroll until you see C.C. turn it off. i had the same problem but my whole screen was a black box,bought a new tv and everything. just figured it out today