I have a Mitsubishi CS-31205, and a black box appears in the center of the picture, covering probably 90% of the screen. The sound still functions, and the box will disappear upon changing the channel, only to reappear after about 5 seconds.
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Re: Black box in the middle of the screen
The closed caption is turned on.
I don't have the schematic in front of me, so, I will wing it. There may be a button on the remote that says CC, if so then use that button to turn it off, if not then go to the service menu and you may have to search a bit.
Either way it's an easy fix and you can do it yourself.
If you can't find it, then, reply and I will give better instructions when I get into my shop next week.
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The manual for Mitsubishi TV model CS-31205 can be found by clicking the link below (Although the link says "CS 31305" , other models such as CS-31205, CS- 31309, and CS-31304, will use this guide as well) Download Mitsubishi CS 31305 Owner Manual
Available for download (and offline viewing) in PDF format with a very short registration, or bookmark in your browser, and utilize online.
If you have a menu button on the front of your tv go into the closed caption portion and turn off the text mode . This will get your picture back . If you don't have a menu button on the front of your tv you will need a remote that can access the menu . Good luck
If a black square appears on the screen and you can see the picture around the edges, it means that the closed captions are on and set to "TEXT". Go into the TV's menu, navigate to the closed captions page and set the captions to OFF.
The quick horizontal line through the center of the screen usually denotes a failure in the vertical output circuit, and that would keep the set from staying on. You would have to take it to a repair shop for repair.