Huawei G7 1st mic not work - GSM-Forum

kylepiwik · 11-26-2016, 13:51

Hi,
i try to change the module but i have some problem.
I checked the correct operation of the microphone detached from the pcb with an oscilloscope and it works properly.

The mic should be like that of the i9300.

From my research the pinout should be:
1 VDD = 2.8V
2-3 GND
4 Vout

On the board less mic
between vout and ground I measure 6.4 ohms
I do not think it is correct.
While I make a voice recording, I try to measure vdd and a few mV.
If i touch Vout recording you hear a noise, so I think the line works.

It seems that the problem is power.
If this model works like a samsung galaxy there should be an LDO regulator upstream of the microphone but can not find in this model.

Anyone know anything?
Thanks

kylepiwik · 11-28-2016, 09:09

Can someone help me?

kylepiwik · 11-28-2016, 19:54

I made other trials, I fed the microphone outside and injected the output of the plate and working properly.
So, the problem is the power supply line.
Someone has the schematics or knows where it comes from that line?
it is difficult to follow because it has a few ohms to ground.

kylepiwik · 11-29-2016, 16:31

Quote:

Originally Posted by kylepiwik

On the board less mic
between vout and ground I measure 6.4 ohms
I do not think it is correct.

Sorry, 6.4ohm from Vdd and ground

kylepiwik · 11-29-2016, 19:09

i solved

!
without schematics is impossible understand the damaged component.
I found 2.8v in other part of the board and i made a jumper.
See the photo.

rixineves · 12-06-2016, 14:39

Hi, i have Huawei G7 but camera not working, have some humidity on mainboard.
So i need the schematic to try a repair,
could anyone help me?

crashi · 01-04-2017, 23:10

kylepiwik works 100 % thanks

salvotp · 01-24-2019, 16:00

kylepiwik....works 100 %

thanksssssss

alishams123 · 10-29-2020, 14:29

Quote:

Originally Posted by kylepiwik

i solved

!
without schematics is impossible understand the damaged component.
I found 2.8v in other part of the board and i made a jumper.
See the photo.

work 100%

good solution

thanks

11-26-2016, 13:51	#1 (permalink)
kylepiwik Junior Member Join Date: Mar 2014 Location: Italy Posts: 32 Member: 2138424 Status: Offline Sonork: 1669910 Thanks Meter: 6	Huawei G7 1st mic not work Hi, i try to change the module but i have some problem. I checked the correct operation of the microphone detached from the pcb with an oscilloscope and it works properly. The mic should be like that of the i9300. From my research the pinout should be: 1 VDD = 2.8V 2-3 GND 4 Vout On the board less mic between vout and ground I measure 6.4 ohms I do not think it is correct. While I make a voice recording, I try to measure vdd and a few mV. If i touch Vout recording you hear a noise, so I think the line works. It seems that the problem is power. If this model works like a samsung galaxy there should be an LDO regulator upstream of the microphone but can not find in this model. Anyone know anything? Thanks

12-06-2016, 14:39	#6 (permalink)
rixineves Junior Member Join Date: Dec 2016 Posts: 12 Member: 2657328 Status: Offline Thanks Meter: 0	Huawei G7 schematic Hi, i have Huawei G7 but camera not working, have some humidity on mainboard. So i need the schematic to try a repair, could anyone help me?

11-28-2016, 09:09	#2 (permalink)
kylepiwik Junior Member Join Date: Mar 2014 Location: Italy Posts: 32 Member: 2138424 Status: Offline Sonork: 1669910 Thanks Meter: 6	Can someone help me?

11-28-2016, 19:54	#3 (permalink)
kylepiwik Junior Member Join Date: Mar 2014 Location: Italy Posts: 32 Member: 2138424 Status: Offline Sonork: 1669910 Thanks Meter: 6	I made other trials, I fed the microphone outside and injected the output of the plate and working properly. So, the problem is the power supply line. Someone has the schematics or knows where it comes from that line? it is difficult to follow because it has a few ohms to ground.

11-29-2016, 19:09	#5 (permalink)
kylepiwik Junior Member Join Date: Mar 2014 Location: Italy Posts: 32 Member: 2138424 Status: Offline Sonork: 1669910 Thanks Meter: 6	i solved ! without schematics is impossible understand the damaged component. I found 2.8v in other part of the board and i made a jumper. See the photo.

01-04-2017, 23:10	#7 (permalink)
crashi Freak Poster Join Date: Apr 2006 Posts: 156 Member: 268332 Status: Offline Thanks Meter: 16	kylepiwik works 100 % thanks

01-24-2019, 16:00	#8 (permalink)
salvotp Junior Member Join Date: Feb 2005 Age: 44 Posts: 2 Member: 114589 Status: Offline Thanks Meter: 2	kylepiwik....works 100 % thanksssssss