Help with peavey TKO 115 s!!

[Maxxtraxxk5]

Hey everyone, my brothers old reliable peavey TKO is having problems. No sound, turns on, he has checked the obvious, cable, bass, power, he has taken the head unit out, no blown fuses, no melted or burnt anything. Speaker has been checked, that's fine. So what else could it be? Any help would be awesome!!

[bryan gibson]

I just did an audition this afternoon with an old Peavey 75w 115 combo as provided backline. Halfway thru the set, the "lo-gain" input crapped out resulting in zero sound. Plugging in to the "hi-gain" port got us back up to speed. Start at the top, and work your way down I guess...