Aporte original por: sl0wM0_44 ,
This happened to a friend of mine also during a screen replacement. There are 2 options: 1) The ear speaker isn’t well connected (or isn’t connected) to the motherboard of your phone. In this case you just need to open your iPhone again to put it back where it was. 2) The ear speaker’s connector’s pins have been damaged during the repair process. If you’re lucky you just have to buy another speaker. If not, that’s the connector placed on the motherboard that has been damaged and I won’t be able to help you for this… you’ll have to continue to use your phone without your ear speaker or replace the motherboard but this will be pretty hard and if you already broke a connector during the first repair, this might not be a good idea to change your motherboard due to the number of different extremely fragile elements placed into your phone… I hope that I’ve been usefull :) Have a nice day.