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I have three of these units and all experienced the same problem and repair.
I cleaned not only the lcds but all the glass panels and lenses near the lcds.
You can power up the unit, select test screen, then carefully unplug and remove the top cover.
With it on you can use a q-tip and CAREFULLYA AND DELICATELY clean the lenses and lcd screens. Some of them have a tight clearence so youll need to cut down your q tips to fit in there. It takes be about an hour per projector but i am able to remove the offending dust and FIX the purple splotches. I forget what color it is but its the center mounted lcd that when dirty makes the purple ****.
YOU WOULD BE AMAZED AT ALL THE **** THAT GETS STUCK IN THERE!
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the lcd panels are fault,you need a new ones
Have a nice day!
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reset the settings to factory default. there may be a resolution issue. make sure it matches the source. if the line is straight and goes right along the pixel line, you may have an lcd issue. if it's blurred, it could be a bad polarizer.
if it's sharp edged and inline with the pixels, you have a bad green lcd panel. if it's fuzzy and random, you have a burnt light filter. either way, it's an optical engine issue. you can try to go into the case, remove the ribbon cable for the green lcd (unlock the ribbon clip first) and reinsert it and lock it down. if that doesn't work, you'll have to replace it.
use canned air and blow every bit of dust out of every vent and hole. if you want to, you can remove the top (6 screws on the bottom, and the 2 top screws on the back) and blow dust out that way. i could also be a power supply problem. from excessive heat, the capacitors on the ps dry up and don't work as they should, causing shutdown.