Phone stucked in headphone mode

[Norway]

My phone (Xperia S) is stuked in headphone mode. I've tried to connect and disconnect the headphones. And I've tried both repair and reset the phone in Pc companion. I've even tried to remove the plug on top of the phone (removed the small screws under the cover), the phone still says that headphones is connected.

To answer the phone I have to use loudspeaker or ear phones, since there is no sound sent to the little speaker when my phone think the headphone is connected. 

Any solution proposals?

[Uliwooly]

check if there's any dust in the 3.5mm connector

[Norway]

Have removed dust. Did'nt help 😞 

[_alexdon_]

Force restart(power button+vol up until the phone vibrates).

[Norway]

 I have tried force restart, it didnt help 😞

[_alexdon_]

Do you have smart connect updated?Try to clear data for it.Also,do you get some notification in the panel?

[Norway]

When I reset the phone in Pc companion it was reset without any data, then I used a back up since the problems still was there. When I turn on the phone I get a message telling me that the microphone and buttons doesnt work.

[Norway]

I've only updated and reset the phone with Pc Companion, should I try using Update Service insted?

[Norway]

I tried to reload the software with Sonys Update Service, no change - still stuck in headphone mode 😞

[_alexdon_]

So you reinstalled with SUS?Still no change?Could you try different headphones?