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Go Back   GSM-Forum > GSM & CDMA Phones / Tablets Software & Hardware Area > Huawei > Huawei Hardware Repair

Huawei Hardware Repair here you can get all the Hardware Repair information

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Old 11-26-2016, 13:51   #1 (permalink)
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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

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Old 11-28-2016, 09:09   #2 (permalink)
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Can someone help me?
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Old 11-28-2016, 19:54   #3 (permalink)
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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.
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Old 11-29-2016, 16:31   #4 (permalink)
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Quote:
Originally Posted by kylepiwik View Post

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
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Old 11-29-2016, 19:09   #5 (permalink)
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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.

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Old 12-06-2016, 14:39   #6 (permalink)
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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?
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Old 01-04-2017, 23:10   #7 (permalink)
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kylepiwik works 100 % thanks
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Old 01-24-2019, 16:00   #8 (permalink)
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kylepiwik....works 100 %

thanksssssss
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