Replaced Dock Connecter - Phone still thinks headphones plugged in

Hey,

I recently replaced the dock connector in an iPhone 5C to find the phone now thinks the headphones are plugged in constantly.

I browsed around and tried many different ways of doing things including things youd really only do for older headphone jacks like swabbing it with an earbud, blowing, inserting and disconnecting headphones multiple times.

I disconnected the dock from the main logic board and it registered that as headphones disconnected, and when I set settings->general->accessibility->Call audio to speaker, phone calls play through the speaker so I know it still works.

What can I do?

Cheers, jack