Its not soldered, it's inside that springy black box on top of the mb. Easy to replace. Get a 2nd hand motherboard (search Aliexpress for "phantom 3 board", lots of them there.? I'm not an expert but if I remember correctly the IMU is soldered to the motherboard
I have this problem as well; Don't be afraid to open it (phantom 3) up, its easy. Do you want to fly it again? If you do, but decide to not open it yourself, you next option is to pay someone a price that will probably be way more than what its worth.Its not soldered, it's inside that springy black box on top of the mb. Easy to replace. Get a 2nd hand motherboard (search Aliexpress for "phantom 3 board", lots of them there.
Hardest part would be to disadsemble the drone body without breaking all the little clips
Good luck
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