So...we're doing a gig Saturday night and during the 3rd set we notice some loud popping and volume swells coming through the FOH. Monitors we fine. Finally, the FOH sounds like a big rush of noise and hum. Our soundman immediately pulls down the main mix. We take a break and I'm looking at the board. The main led's are lighting up and peaking in the red. We pull down each channel 1x1, we pull down the sub group faders, and we unplug the snake, and the board is still lit up and peaking.
We are running a Mackie 1604-VLZ Pro. Any thoughts on what might cause this? Obviously, it's not a DYI fix, but wondering if the board is shot or worth repairing.
Any input is greatly appreciated!!