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Movies that are created for "Wide Screen" viewing show up in letterbox on your TV. If you go to a theatre you notice it is a big rectangle. To be able to fit all of the widescreen movie on a TV it has to make the height smaller.
Because many people want to see the "complete" Movie, the "Letterbox Format" came about. I do NOT know what the word "Letterbox" actually means, or how that term was chosen. To get the complete Rectangle into that Square, they discovered that they could shrink the entire rectangle to fit that square. Meaning, what used to take 2 inches on your screen, now may only take 1.75 inches. Now a problem arrose. When you shrink the WIDTH to fit your dinky Square of a TV, the HEIGHT also has to be shrunk along with it, or else you're stretching the image as if it was on silly-putty ("Compression"). When the image was shrunk to fit the TV Screen, they were left with a gap at the top and bottom of the screen. So they simply fill it in with "Black". I guess the only alternative was to leave it snowy.
Yes, this is rare but I have seen it before--not fixable if it is what I think it is----It is what is called a Dome effect---the shadow mask in the picture tube is actually contracting and or expanding depending on temperature---
Directly behind the phosphor coating (the stripes that you see on the screen) is a metal screen--the holes or perforations in it line up with the stripes on the phosphor screen.
Some masks either have a material or a defect causing the dome effect----Not likely to be anything else---a Pin amp problem will not usually act the way you describe but a shadow mask inside the picture tube will act exactly that way.
There are probably two capacitors that are bad in the vertical circuit. Not too hard to replace if you have any experience at all. Find the vertical output IC ( usually IC451 or similar ) and simply change the closest electrolytic capacitors. A professional can do this easily. Could cost up to $150.
16:9 is the widescreen mode, the other size is 4:3 ratio which is what the game's native size, it is picture boxing by the plazma is showing the size as not to distort the image, to get the full screen picture, but make sure it's not the plazma's setting first - where it selects the size of the image, you may have the streched version on your normal play.
If the broadcast is in 4:3 (square) then either you can have the black bars on the side, or the TV can stretch the image to fill the screen.
Nothing wrong with your set. The broadcast must be in 16:9 to fil the screen.
In electronics dust has nothing to do.
cleaning will not solve your problem
your problem is due to trouble in vertical section.
mostly it is due to electrolytic capacitor in vertical section is defective.it is common problem.
also check supply to vertical section.
"THE SCREEN SHRINKS TOWARDS THE TOP OF THE SCREEN FOR A FEW SECONDS BEFORE THE PICTURE TURNS UPSIDEDOWN THEN TURNS BLACK." is called fold over.