Summer, water, and phones, they don’t mix together.
This time is about an iPhone 6 plus was water damaged, then dried out, everything works, except it stuck in headphone mode, no matter you have headphones plugged in or not, it is always in headphone mode.
Take off the board
Doesn’t look so good, fixing it is easy enough, Basically clean, reball, put shields back on, test. I will simply let the pictures explain it.