Sorry but this is a repost from accidentally posting in the D series forum.

I took the f700bt apart to see if the pico fuse was blown because I was getting some noise. After putting it back together, the volume control no longer works but I can push the rotary button up and down and get response. So the rotary function no longer works.

I was wondering, is this likely a ribbon cable that has been damaged? If so, does anyone know which ribbon cable the rotary knob uses to communicate with the main board? Theres a few ribbon cables in there, one big one and a few smaller ones. I may try replacing the ribbon cbale to see if that fixes it.

Any help much appreciated.

look very carefully at all of the ribbon harnesses, do you see any dammege?, also make sure that they are all plugged in all the way, if part of the button is working (up, down, left and right, but the rotation doesn't you may have a bad control knob)