iPhone not recognised by computer

Hi there, i bought some broken iphone with good motherboard.

the iphone could get recognise by the computer before. Now that i have bough a new housing full housing and i put the motherboard inside, the iphone turn on, everything work perfect.

even when i put it on charge with the normal charger, the iphone battery is charging.

but i can't get the iphone on itune at all.

it wasnt jailbroken and was working perfect before i swap housing.?

can you please Help me solve this issue?

thanks