Chosen Solution
So I fixed my iPhone a while back and I still remembered that before I had done the fix, the earpiece worked perfectly fine. However, now that the phone is fixed I dont hear anything from the earpiece whatsoever. The only means of communication through the phone are either using the speaker phone, bluetooth, or just headphones. I am contemplating on getting a new earpiece to see if that’ll work, but I’d rather ask first to see what you guys think. Other than that everything works great on the phone! So..any thoughts…
have you try with the loud speaker . then may be a earpiece or flex is not properly connected to logic board. check the connecter no 3 is properly connected . if connected then open the display assembly there you will see the small piece of iron see: iPhone 3GS Display Replacement see the step 11 you will see a small screw holding that remove and try gently remove that portion then you get the earpiece . check with multimeter whether is working or not or just change it ..
