Projection TV Troubleshooting: Cleaning the Optics/Lenses

The all-important element that must not be overlooked in CRT technology is optics cleaning! CRT Rear Projection TV’s have 28 surfaces in their optical path. On some brands only 4 of those 28 get dirty, but on other brands 10 of those 28 get dirty, mostly due to the 30,000 volts of high voltage (HV) used in CRT operation.  The high voltage causes all airborne contaminants – soot, pollen, dust, lint and all kinds of grit – to be literally sucked out of the air and deposited on the fragile, vulnerable plastic surfaces as well as up against the front surface mirror.
This optical path requires very special cleaning techniques and materials in order to stay safe, unscratched and unscuffed, the latter of which consists of literally thousands of tiny scratches at a time. Be sure to have a qualified technician perform this procedure.  It only takes one false move to put permanent damage onto a system’s irreplaceable optics!


Robert Jones is a Professional LEVEL II ISF Calibrator. His special talent lies in using the Image Perfection protocol as the final and most crucial step in the ultrafine tuning of High-Definition Home Theater and Front and Rear Projection TV systems. He optimizes and extends the working life of Projection TVs to 20 years and beyond.  Bob started the popular “Don’t Dump Your CRT-RPTV!” thread in 2006. It has over 13,000 posts spanning more than 400 pages and it is still going strong. These posts can be found at  under the handle “Mr Bob”. Informational videos can be found at Youtube channel MrBobBigScreen. You can reach Bob directly at 510-278-4247 or Though Bob specializes in Pioneer and Mitsubishi projection TV’s, he repairs and maintains Flat Screen and Flat Panel systems made by most manufacturers.



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