Hello, My name is XXXXX XXXXX X will be glad to assist you.
The dots that you're seeing, are actually an internal problem with the TV that requires a component to be replaced.
This problem is one that is common with your set, and any DLP that uses a "DLP" in the Light Engine. The DLP chip which contains thousands of tiny mirrors on it is the culprit, and each spot that you see, is one of the tiny mirrors failing. The problem will continue to get worse until the DLP chip is replaced, and there are no settings you can adjust, etc. that will fix the issue. Mitsubishi is aware of the problem and has been covering half the repair on a case by case basis. The chip itself is $300 and the cost of labor is also $300, with Mistubishi covering the cost of the part, you will be left with the labor charge. You should contact Mitsubishi at the number below and tell them that you have a failing DLP chip and you would like them to fix the problem.
It's not documented anywhere that they're doing this, nor is there any kind of class action lawsuit, so the choice is ultimately in their hands. If they do NOT decide to help with part of the repair, then I would personally replace this TV in lieu of repairing it, as this set will eventually have the same problem again.
If you need further assistance, let me know.
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Is there a component schematic available for this TV somewhere?
No, and there is not one needed for this. The DMD board is visible when you remove the rear of the TV. Click on the link below for step by step instructions on how to replace the DLP chip yourself:
The DLP chip in located on the center of the board and release with a couple of screw clips.
The chip for your set is available at the link below for purchase if you choose to do this yourself: