Use this guide to remove or replace a faulty motherboard.
This guide involves removing the rear glass cover, you will need replacement adhesive to reattach the back cover to the phone.
The motherboard and daughterboard will differ slightly depending on whether you have the North American Snapdragon (G950U) or international Exynos (G950F) version of the phone. This guide uses the North American version. The motherboard and daughterboard are not interchangeable between the two versions.
'''Before disassembling your phone, discharge the battery below 25%. The battery can catch fire and/or explode if accidentally punctured, but the chances of that happening are much lower if discharged.'''