해결 되 었 습니다 : Top speaker problem in my phone - iPhone 5 s - iFixit 
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 Top speaker problem in my phone 
 When i receive call i can ' t listen them properly . I have just replace screen 4 month ago and when i tried for video call and set up loud speaker another person in call isn ' t able to listen my voice but they can listen to me when i use headphone 
 Look at the hole in your screen , where there is a small piece of black mesh . 
 Behind that mesh there are the ear - speaker from which you listen when phone is near to your ear AND the mic from which you talk when in loudspeaker mode . 
 If this issue happened some time after your replaced the screen , and the sound became lower and lower with time , there is probably some dirt on the mesh . Brush it clean with a toothbrush dipped in iso propyl alcohol ( 90 %+) or even scrap with a needle and then punch 3 - 4 tiny holes . 
 Shyam 가 / 이 대단히 고마워 할 것 입니다 .