Black and White rectangles, no picture just sound

Sounds like 'picture in picture' was turned on. And if there is no 2nd video source, it shows up as a black rectangle. Find a button that is labelled PIP or similar and press it, maybe several times. It may move the PIP around the screen before turning it off.

Sounds like it is closed captioning coming up. I would go in and verify both your TV's and the Cable/Satellites closed captioning is off.

Check the white rectangular ceramic fuses on the FMT board. You blew one of them so there's power missing to some of the circuitry.

It would be "cheating" for anybody to do your "homework" from your computer-mathematics class, unless you submit your answer, saying that an EXPERT on FIXYA did all the work on your behalf.

I took it back and got a full refund.

If you plug in the Video inserts the way they illustrate it, you get black and white with sound. If you are using RCA cables plug the yellow cable on CVBS and the white and red cables on the Video-L and Video-R.

That is the PIP (picture in picture) setting, on the TV's remote control. locate the button marked PIP and press the button, it should clear the little box.

If the trouble is black and white looseboard in CRYSTAL. Loose need to resolder.

Try pressing the "View" button on the remote control a couple times -- it sounds like you have the picture-in-picture mode turned on but with nothing showing on the second input.

Mitsubishi list this problem and has a solution of replacing several small surface mounted caps and diodes. we have tried this repair 5 times and only successfully done it once. so replacing what is called the formatter board part # 930B924002 for around $ 350.00 usually repairs this type of failure, However changing this board is a time consuming thing and takes a lot of Patience. It is buried deep in the set and several other board have to be removed just to get to it