Hello, cleaning may help, but I would bet the coolant in the crt's is mildewed, a common issue with Phillips projection sets. you can unplug and remove the back cover and get to the lens assembly to clean them with a lint free towel and glass cleaner, spray the towel and wipe them all 3 off and dry with a clean towel and re-install the back cover and see if that helped. If it didn't it's the coolant in the crt's that will need to be changed by a technician. tks
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