Can you repair Mother board?

@aman778, Amansharma, This is ifixit volunteer site. Ifixit does not do repairs on items, we offer advice/trouble shooting on how repairs are made through answer forum and parts and tool store offer some parts for purchase. It takes good knowledge and some test equipment to enable the trouble shooting and repair of a mother board in a cell phone. Below find a video showing how to remove a mother board which will enable you to check(clean all connections with Qtip dampened with 90%+ Isopropyl Alcohol) and reseat connections, check for loose, burnt, damaged wires/components, reassemble and try.

2nd and 3rd links are guides showing replacement of audio jack and ear piece speaker.The 4th link is where you can inquire when the board may be available again as it is currently out of stock. If not comfortable working on phone, best to take to a good a local computer/cell repair shop for an estimate on repairing your device. Good luck. I hope this helped you out, if so let me know by pressing the helpful button.

https://www.youtube.com/watch?v=lVBkBiYz...

Moto G4 Plus Audio Jack Replacement

How to replace Moto G4 Plus Earpiece Speaker

http://www.ebay.com/itm/OEM-UNLOCKED-MOT...