From an authorized PANASONIC, MITSUBISHI AND BEN-Q repairman;
Here is a FREE and very effective stress method to repair LCD projector, without changing panels or prism, all you need is time, a computer hook up to the pj and 2 free software (google will find them)
1- download the free program JSceenFix by HostYourself.
2- download MonitorTEST from passmark.
(leave brightness to 1/4 setting, contrast to normal and image to dynamic for the entire procedure)
Run JscreenFix for 15 minutes
We are not using JscreenFix for it's dead pixel fixing capability, we are using it to have an even heat all across the panel before starting the other application.
Run monitortest and go to the black screen pattern. Leave it there for 3 hours(click the red arrow to remnove the toolbar). At first, the burn-in spot will appear as a blue hue, after 2-3 hours, it will began to fade to black.
While the pj is still hot, go to the white pattern. Leave it there for 4-5 hours. (click the red arrow to remove the tool bar)
You're done, TURN THE PROJECTOR OFF FOR A COUPLE OF HOURS!!!!
This method is stressing the blue prism and kind of reset it to it's like new condition.
Now, just remeber that the projector is HIGHLY VULNERABLE right after the test due to the heat on the LCD, the safest thing to do is to wait until the next day before testing the unit (be patient and you will be happy of the results, if not....)
I have tried this on 2 projectors, a pany900 with blackbar burn-in and a pany pt-lb10u XGA with MS FlightSim dash panel burn-in.
I was ready to trow those pj or re-sell them for cheap on e-bay when an old friend of me who work for a repair shop send me this method. I am very happy with the results, they are both like new.
BE PATIENT AND FOLLOW EVERY INSTRUCTION IN THE RIGHT ORDER!!!!!!
Share youre result, fermontppg