Close captioning stays on all the time.

check your tv power supplay, it may fix the problem

Unplug the set, remove all other audio/video components, go open front door, and roll it out to the curb.

check the "close caption" option on the menu should be of

Well lets try the simple things first, Go to the TVs menu using the original TV remote and find the icon or menu that says Captions, in that menu turn all the closed captions OFF. Second there is a button on the original TV remote that says format, push this till you get to a screen that says FULL in the upper left corner. That should resolve your problems, If closed caption still comes through then we need to know if this set is hooked directly to cable or goes through a cable box. It sound like you simply had the closed caption turned on and the screen in one of the zoom formats this TV provides

It s a Power supply problem.If you are not familiar with electronic repairs take it to an authorized repair shop.
To get a service manual see link
Download Mitsubishi WS-55807, WS-65807, WT-46807, WS-55857, WS-65857, WS-55907, WS-65907, WS-73907 Service Manual
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flyback

RGB picture guns ( CRT's ) are ok. Your set needs a common
convergence circuit overhaul requiring replacement of two IC's,
part # STK392-570. Usual cost about 400.00.........T.

I own a Mitsubishi WS-55807 55 in. for parts if you are interested. Please contact me back if interested. 727-773-8208 Nicole

Check fuses F9A04 and F9A05 (5A micro fuse)on the board in the middle.If one or both are open than you need to change both the convergence IC's (STK392-570)along with the fuses.

Go into the menu and see if your closed captions are on and set to "TEXT". Setting the closed captions to "OFF" should solve your problem.