On my apex 40 inch model number gb5108 screen i notice during commercials that have a white screen in the background that a black line starts at the top and moves downward. i am wondering if there is any adjustment that i can do to fix this problem or if there is something else wrong, ex: maybe a filament??? any assistance is appreciated
Televison & Video - Apex Digital - GB5108 51" Rear Projection EDTV-Ready Television