Scirocco Central

Hi all i have recently removed a carplay unit from my Scirocco as it has completely died, so i have reinstall the OEM headunit however once i have reinstalled the unit there is no sound coming through the speakers but the radio is on and working as it should visually. The carplay unit i had didnt use the Dynaudio system i am pretty sure but before this was installed the OEM radio worked fine and had no trouble with it at all other than not have carplay. So at the moment i have no radio to listen to until i can sort a new carplay unit or sort the original which i would prefer for the time being. Does anybody have any idea as to what could cause this as i have absolutely no idea about anything to do with sound systems and what no so if anyone could be of help i would appreciate alot.

THANKS!