itaste mpv2 won't heat eliquid

[fido69r]

I dropped my mpv2 and since then it won't heat up. I changed the coil a few times with news ones, and nothing. I put a meter on the centre pin and ground, and get 5.2v ...I unscrewed the atomizer tank, and removed the coil, and get voltage through the atomizer...so centre pin and wire ok..took the top off the mpv, and all wires to the board seem intact....absolutley baffled. If voltage is going to the coil, then surely it should heat the liquid right?  everything else seems to function ok....although, with the atomizer on, and the two buttons pressed, it's showing "non"....anyone got any ideas?....thanks.