T28, mic not working - GSM-Forum

MaRiN · 10-28-2001, 20:37

I have few T28 and I have problems with theirs microphones. 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. Does anybody know where might be problem, because I have five phones with this problem? <img src="eek.gif" border="0"> <img src="eek.gif" border="0"> <img src="eek.gif" border="0">

nnarta · 10-28-2001, 21:36

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

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

Weller · 10-28-2001, 22:53

Check your E-mail

MaRiN · 10-28-2001, 23:39

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

Porter · 03-31-2003, 21:15

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 · 06-18-2004, 22:19

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

Thks

MaRiN · 06-20-2004, 03:48

Try to change Multimode IC

noone0 · 07-08-2004, 01:11

where is multimode IC ???
thks

MaRiN · 07-09-2004, 01:44

Look at the picture!

Unggul · 07-09-2004, 17:50

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 · 07-09-2004, 19:13

thks .. I will try and post results

goanga · 07-12-2004, 17:02

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 · 07-15-2004, 15:35

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 ???

10-28-2001, 20:37	#1 (permalink)
MaRiN Freak Poster Join Date: Nov 2000 Location: Croatia Age: 47 Posts: 353 Member: 2466 Status: Offline Thanks Meter: 10	T28, mic not working 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">

10-28-2001, 21:36	#2 (permalink)
nnarta Freak Poster Join Date: Aug 2001 Location: Russia Posts: 154 Member: 5850 Status: Offline Thanks Meter: 0	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">

10-28-2001, 23:39	#4 (permalink)
MaRiN Freak Poster Join Date: Nov 2000 Location: Croatia Age: 47 Posts: 353 Member: 2466 Status: Offline Thanks Meter: 10	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">

07-09-2004, 17:50	#10 (permalink)
Unggul No Life Poster Join Date: Jul 2004 Location: Bandung - West Java, Indonesia Age: 43 Posts: 501 Member: 71273 Status: Offline Thanks Meter: 14	100% tested done i have the same problem mic, cable and line is working well. i was rehot the multimode ic's and 100% tested ok!! regards

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
v3 mic not working display light ok keypad light not working	shani72	Motorola Hardware Repair	2	10-22-2009 08:15
1200 mic not work jampar ok bat not work pizzzzzh........................?	punitdodiya	Nokia Hardware & Hardware Repair	5	09-08-2009 22:52
pls urgent --- GIVE ME THE BIRD S199 MIC TRACK(SCH) MIC NOT WORKING	shahi	Infinity-Box	0	10-10-2007 15:02
moto c 200 mic not working . want mic ways with picture	shahi	Motorola Hardware Repair	0	03-01-2007 10:15
6630 mic not working need mic ways	ashok_kumar459	Nokia Hardware & Hardware Repair	3	02-13-2006 18:14

10-28-2001, 22:53	#3 (permalink)
Weller Insane Poster Join Date: May 2001 Location: Zagreb Posts: 65 Member: 4526 Status: Offline Thanks Meter: 0	Check your E-mail

03-31-2003, 21:15	#5 (permalink)
Porter No Life Poster Join Date: Jan 2003 Location: Ukraine. Lviv Age: 43 Posts: 1,781 Member: 19633 Status: Offline Thanks Meter: 13	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

06-18-2004, 22:19	#6 (permalink)
noone0 Freak Poster Join Date: May 2002 Location: none Age: 49 Posts: 208 Member: 11926 Status: Offline Thanks Meter: 0	I have 2 phones with the same problem as Porter... all the help is appreciated Thks

06-20-2004, 03:48	#7 (permalink)
MaRiN Freak Poster Join Date: Nov 2000 Location: Croatia Age: 47 Posts: 353 Member: 2466 Status: Offline Thanks Meter: 10	Try to change Multimode IC

07-08-2004, 01:11	#8 (permalink)
noone0 Freak Poster Join Date: May 2002 Location: none Age: 49 Posts: 208 Member: 11926 Status: Offline Thanks Meter: 0	where is multimode IC ??? thks

07-09-2004, 19:13	#11 (permalink)
noone0 Freak Poster Join Date: May 2002 Location: none Age: 49 Posts: 208 Member: 11926 Status: Offline Thanks Meter: 0	thks .. I will try and post results

07-12-2004, 17:02	#12 (permalink)
goanga No Life Poster Join Date: Mar 2004 Location: romania Age: 42 Posts: 742 Member: 57035 Status: Offline Thanks Meter: 70	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 !

07-15-2004, 15:35	#13 (permalink)
noone0 Freak Poster Join Date: May 2002 Location: none Age: 49 Posts: 208 Member: 11926 Status: Offline Thanks Meter: 0	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 ???