Can't turn on Gopro on battery after water damage. Works on USB.

Hi everyone,

A few months earlier, I got my Gopro immerged into pool water. I didn't see it immediately, but around 2 weeks later, when I tried to turn it on, I couldn't : no reaction from the camera, the screen kept off and I had no LED indicator.

However, the camera works finely when alimented by USB cable... The problem is not coming from my batterieS : I tested 3 different ones.

I'm suspecting a disease somewhere on the motherboard between the battery connector and one of the component because as I said, the camera has no problem on USB. How can I repair it to make it work again on battery ?

Thanks for the good work you're providing on this website.