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If experiencing excessive brightness in the VZ5 chassis mitsubishi's it usually can be traced back to a leaky transistor on one of the CRT PC boards. Check Q6R1 on Red PCB, Q6B1on the Blue PCB and Q6G1 on the Green PCB one of these transistors will most likely be leaky
It may be fluid from the picture tubes. They have a silicon based fluid inside the lens housing that helps keep them cool, unfortunantly the fluid in this model leaks. The fluid is corrosive but not conductive, meaning that it can sit on the board long enough to eat through the board but not short it out. There is a 1" square ic on the main board (large green board on the left) usually if there is fluid damage it will be there and you will know it by:
1. green residue all over or around chip
2. clear fluid on the board.
This is a very common problem and is almost always catistropic. Meaning that the tv is not repairable. I hope you don't have this problem but chances are that you do or will in the near future with this model. This is just a guide as to where the fluid may be on the board, but it may be anywhere. Hope this helps.
I have seen this before, and I can only describe it as a flaking of the phosphorus coating in one of the picture tubes. If you can, remove the back such that you can take a flashlight and look down into the 3 picture tubes. If you see any flaking or dark spots in the phosphor, there will be a spot on the screen missing that color. Unfortunately, this is not repairable, as all 3 tubes would need to be replaced (like replacing all 4 car tires when one is completely bald) and that would cost more than a new TV.