Ursprünglicher Beitrag von: Minho ,
When the device believes it is in headphone mode, even without headphones connected, it is usually because one of the spring loaded contacts is permanently”pushed in”. This could be from physical damage or just gunk/dirt that makes it jam into position. Have you tried cleaning the jack with a fine point cotton swab and some IPA or are you just removing lint etc.? The other option is to replace the headphone port.