T28, mic not working

[MaRiN]

I have few T28 and I have problems with theirs microphones. <br />Small two wire cable from pcb to flat is ok, and flat cable is ok, but other side can't hear me. Phone is ok, because I try with cover form working phone and everithing is ok.<br /> <br />Does anybody know where might be problem, because I have five phones with this problem?<br /> <img src="eek.gif" border="0"> <img src="eek.gif" border="0"> <img src="eek.gif" border="0">

[nnarta]

Hi, Marin!<br />Carefully open flip and:<br />1. Check the soldering of 4 little elements at the flat cable.<br />2. Replace microphone.

<img src="smile.gif" border="0"> <img src="smile.gif" border="0"> <img src="smile.gif" border="0">

[Weller]

Check your E-mail

[MaRiN]

Thanks guys!<br />Problem is solved!<br />There was a little breach on one of 4 small smd components <img src="smile.gif" border="0">

[Porter]

Hi! I have same problem but in my case microfon & flat cabel is ok!
I have here eho in speaker but my oponent don`t here anythyng.
Is it audio IC? any idea? Thenks

[noone0]

I have 2 phones with the same problem as Porter... all the help is appreciated

Thks

[MaRiN]

Try to change Multimode IC

[noone0]

where is multimode IC ???
thks

[MaRiN]

Look at the picture!

[Unggul]

i have the same problem mic, cable and line is working well.
i was rehot the multimode ic's and 100% tested ok!!
regards

[noone0]

thks .. I will try and post results

[goanga]

RESOLDER with flux the audio IC . if it doesn't works try resolder the litte capacitors near the microfon conector on the PCB ! works for me 100% REGARDS !

[noone0]

The audio Ic didn't work... now I'm going to try the capacitors.

Is it possible, to ear a eco in the speaker, with or without microphone connected ???