I spoke to a technician at Toshiba today re the faint vertical bands found in many LCD projectors .He said they CANNOT be removed because they are actually the wires in the LCD paneL!! He said it was no point in accessing the service menu as the lines are inherent in the structure of the LCD panel it self. so basically if they are there thats it!!. I find personally that use of an HTPC very much reduces this problem. and a bit of a defocus. I am also waiting for a HOYA filter to see if this has any effect.