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hit menu button on your remote, navigate to channel setup menu. on the sub-menu, set channel fix to your channel that you require. now when your tv powers up this will be the default channel. if this doesn't fix your issue then try cycling through video inputs tv/video button on your remote.
You've managed to turn on "SAP" (second audio mode) which will cause the trouble. It doesn't affect all channels, as you're finding out, and can be frustrating. Mitsubishi remotes have a singe button for SAP, if I remember correctly, and you can press it and change modes without knowing it. (The button may be marked AUDIO or SAP.) Just press the button until the on-screen display tells you SAP is off. This will bring the sound back to normal.
This ranks up there with the mysterious black box that appears on some channels. This is because of closed-captioning being set to TEXT, and it happens the same way: pressing a button on the remote.
A solution I found for our KV-32XBR200 was to press Setup on top of the set, then select the "Demo" item with TV/Video. The text overlay apparently banished PIP. Verified this twice, as I'm at this page because our remote can only turn PIP on :-).
The black box is there because your closed captioning is on and set to text mode. Some channels send the signal even when there is no actual text to display. You can get rid of it by either turning off closed captioning or changing it to CC1 or CC2 mode instead of text. If you can't find those settings, then restore factory settings as directed in your user manual.
If you mean that you get a black box, with a little of the picture visible around the edges, then your closed captions are on and set to TEXT. This puts a black box on the screen about 10 seconds after changing the channel. Go into the menu and turn off the closed captions and the picture will be back to normal.