Iphone 4 mic not working. - GSM-Forum

sonkar · 10-03-2013, 10:55

I have received a iphone 4 in which mic is not working.
I have changed the charger with mic and still not working neither in hansdfree.
So i dont know if is some problem in motherboard.
ÇIf some can give any idea.

Soleous75 · 10-05-2013, 03:54

Hello sonkar,
because it is not working in hands free. (assuming that it is being plugged into a headset).
I would possibly look at (i know you possibly have), but look at the sound settings make sure it is not muted? maybe the switch on the side of the phone is not clicked off properly, possibly some grit stopping it clicking on. double click home button slide to sound and see if you can move slider. There are 2 mics in iphone 4g one at the top of power button cable. Maybe also try another dock connector as I have had some with buggered mics before.
hope it helps
Soleous75(Mobile i-Tech)

eben.he · 10-05-2013, 08:46

I guess u should tell us what cause this problem liquid corrosion or dropped.

i can only give u a brief descrip of how mic working.

when u making call U60 will send a 1.8v voltage through R48 to J3 pin 37 it will go through mic negative side to pin 39 there is one capacitor and resistor to U60, then the positive side will go to pin 41 it will meet FL13 and C142 and others.
so make sure the 1.8v voltage generated when making call. and there is to test point TP433 nega and TP432 posi .which can test if U60 works.

liton877 · 01-22-2014, 17:57

i have iphone 4g its same time mic ok sametime mic not working plz can helf me

10-03-2013, 10:55	#1 (permalink)
sonkar No Life Poster Join Date: Dec 2000 Location: las palmas ,spain Posts: 2,012 Member: 2800 Status: Offline Thanks Meter: 47	Iphone 4 mic not working. I have received a iphone 4 in which mic is not working. I have changed the charger with mic and still not working neither in hansdfree. So i dont know if is some problem in motherboard. ÇIf some can give any idea.

10-05-2013, 03:54	#2 (permalink)
Soleous75 Junior Member Join Date: Oct 2013 Location: www.mobileitech.com.au Posts: 6 Member: 2040206 Status: Offline Thanks Meter: 0	Hello sonkar, because it is not working in hands free. (assuming that it is being plugged into a headset). I would possibly look at (i know you possibly have), but look at the sound settings make sure it is not muted? maybe the switch on the side of the phone is not clicked off properly, possibly some grit stopping it clicking on. double click home button slide to sound and see if you can move slider. There are 2 mics in iphone 4g one at the top of power button cable. Maybe also try another dock connector as I have had some with buggered mics before. hope it helps Soleous75(Mobile i-Tech)

10-05-2013, 08:46	#3 (permalink)
eben.he Junior Member Join Date: Sep 2013 Posts: 15 Member: 2036067 Status: Offline Thanks Meter: 2	I guess u should tell us what cause this problem liquid corrosion or dropped. i can only give u a brief descrip of how mic working. when u making call U60 will send a 1.8v voltage through R48 to J3 pin 37 it will go through mic negative side to pin 39 there is one capacitor and resistor to U60, then the positive side will go to pin 41 it will meet FL13 and C142 and others. so make sure the 1.8v voltage generated when making call. and there is to test point TP433 nega and TP432 posi .which can test if U60 works.

01-22-2014, 17:57	#4 (permalink)
liton877 Junior Member Join Date: Dec 2012 Location: maldives male Posts: 4 Member: 1848388 Status: Offline Thanks Meter: 0	i have iphone 4g its same time mic ok sametime mic not working plz can helf me