hi i have a 7500 that for sum reason has locked up on ch800 and sumthing.i was in the middle ov a channel scan when it happened.it was working fine up till that point so if anyone could help or have any info on what i can do to fix it(won"t bin it if anyone surgestes)i would be greatfull for your advice and help.chow4now. (i an"t aware ov to many things but if you know what i know you"ll know what i meen)