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this fault is caused by defective electrolytic capacitors in the vertical deflection circuits, they need to be changed out, do this before it causes more problems, there are no adjustments for this anymore.
After checking today to see no one offered any suggestions - I solved the problem the hard way - I went into settings and although the screen rolled, I was finally able to click onto the ntsc setting after about a half hour of tries and once I clicked it, my screen returned to normal -- i was then able to enter the code that made the player an all region player and was happily able to play a pal dvd I received recently. The procedure was simple -- offered by a European Cyberhome user -- the company is in bankruptcy so you cannot gt help from them. Note - my Cyberhome dvr is 1500- not 1600 as you listed it.
I would check the capacitors in the verticle deflection circuit. Also try resoldering the verticle output as well as the verticle yoke pins where they connect to the chassis. Mitsubishi has had some trouble with their capacitors, you may have one that is leaking. Let me know if I can help you further.
I have seen this many times. There is a 9 volt regulator on the small signal board that causes this. The regulator goes bad and the 9 volts starts dropping, especially at start-up when the regulator is cold. If the voltage is below 8 volts then the picture gets dark and the vertical becomes unstable, with the picture squeezing down and/or rolling. As the regulator warms up the voltage starts rising back towards 9 volts and the symptoms start clearing up. There are 3 regulators in a row on the board and the regulator in the middle is always the bad one. Replacing that regulator should cure your problems but it should be replaced by someone experienced in servicing Mitsubishi projection TV's because pulling the chassis out is quite tricky.
The picture is rolling because there is no sync signal in the composite output. Are you using the RCA jack or the S-video output? Is there another small TV you could hook up for a test to see if the problem appears there? If it does, then the Akai has the issue and needs to be examined further.
If not, the TV input may have an issue. You didn't say what the TV is but there is the possibility the video input is looking for external sync from the DVD but that's a bit of a stretch. Can you feed a different source into the video input of the TV to see if you get the same result?
Hope this helps.