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KGL4 Mic MOD

110 posts
Thanks Meter: 51
 
By hadjistyllis, Senior Member on 19th November 2015, 08:38 AM
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Why I need this mod?
- Because unit use microphone/s for android and Bt calls, which are connected together. That make the mic very weak and sound bad, just like you connect two speaker on one speaker output. So if we separate fro each input other mic then everything is fix

How to do Mic separation?
1 - First you need external Mic (any good mic is ok), and an external mic jack.
2 - Cut pin 4 instead of remove c32 (much easier and easiest to fix if something goes wrong.)
3 - Use shielded cable/s (I use fat speakers cables and shielded enough) and solder pin4 + to the back of the module and pin5 - to the front of the module (I was lazy enough and don't want to remove board that why). You can solder both of them to the back and everything will be ok.
4 - No needed any other mod as internal mic is used only by android and its sound is good enough now.

Now BT calls are perfect. I use my old pioneer microphone.

My other work
1. Radio fix http://forum.xda-developers.com/andr...-kgl4-t3279439
2. Red apps. http://forum.xda-developers.com/andr...radio-t3278054
The Following 2 Users Say Thank You to hadjistyllis For This Useful Post: [ View ] Gift hadjistyllis Ad-Free
 
 
19th November 2015, 08:40 AM |#2  
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And PICTURES ofcourse
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3rd December 2015, 09:10 AM |#3  
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Quote:
Originally Posted by hadjistyllis

Why I need this mod?
- Because unit use microphone/s for android and Bt calls, which are connected together. That make the mic very weak and sound bad, just like you connect two speaker on one speaker output. So if we separate fro each input other mic then everything is fix

How to do Mic separation?
1 - First you need external Mic (any good mic is ok), and an external mic jack.
2 - Cut pin 4 instead of remove c32 (much easier and easiest to fix if something goes wrong.)
3 - Use shielded cable/s (I use fat speakers cables and shielded enough) and solder pin4 + to the back of the module and pin5 - to the front of the module (I was lazy enough and don't want to remove board that why). You can solder both of them to the back and everything will be ok.
4 - No needed any other mod as internal mic is used only by android and its sound is good enough now.

Now BT calls are perfect. I use my old pioneer microphone.

Please can you tell me how to exactly connect mine jack? I have two wires from jack and I need to know to which pins or points I have to connect them.
Thank you
3rd December 2015, 01:37 PM |#4  
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Quote:
Originally Posted by ReVolte11

Please can you tell me how to exactly connect mine jack? I have two wires from jack and I need to know to which pins or points I have to connect them.
Thank you

Solder positive (+) to pin4 and negative (-) to pin5 (positive is the top of jack).
But FIRST cut pin4 to separate bt card from mainboard.
3rd December 2015, 01:45 PM |#5  
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Quote:
Originally Posted by hadjistyllis

Solder positive (+) to pin4 and negative (-) to pin5 (positive is the top of jack).
But FIRST cut pin4 to separate bt card from mainboard.

I did cut c102 (others have it as C32) Is that a problem? Because the lines of connections of pin 4 and 5 goes thorough it.
4th December 2015, 05:30 AM |#6  
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Quote:
Originally Posted by ReVolte11

I did cut c102 (others have it as C32) Is that a problem? Because the lines of connections of pin 4 and 5 goes thorough it.

Only need to cut pin4 line. Post some screenshot and your device model.
Yousolder and mic is not working?
4th December 2015, 07:57 AM |#7  
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Quote:
Originally Posted by hadjistyllis

Only need to cut pin4 line. Post some screenshot and your device model.
Yousolder and mic is not working?

I am going to reserve some time for another fixing and then I will post my photos. And yes, when I use BT call I can hear crappy sound and some voice from FRONT mic. Now I am not sure if the external ever worked because I didn´t try from what mic I get sound. Do you know how exactly is working front mic and his affection of BT call?
Thank you!
4th December 2015, 05:11 PM |#8  
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Thanks Meter: 51
 
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Quote:
Originally Posted by ReVolte11

I am going to reserve some time for another fixing and then I will post my photos. And yes, when I use BT call I can hear crappy sound and some voice from FRONT mic. Now I am not sure if the external ever worked because I didn´t try from what mic I get sound. Do you know how exactly is working front mic and his affection of BT call?
Thank you!

Normally cutting the pin disconnect entirely front mic from bt card (check if the pin you cut writes mic+ on bt card from front or back). Also try using other external mic and see if it works. Also check voltage between two pins and report.
Do you have kgl or kld or .......?
4th December 2015, 07:40 PM |#9  
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I have KYD version and its slightly different than yours. I will try to do some photos to get you now how it looks inside.
12th December 2015, 08:27 PM |#10  
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Hi,
so I made some pictures and improvements in my unit. I left my microphone connected in the same way I soldered it, but I shielded the jack wire for it whole length in radio. Now i have no static noises, but my microphone is still weak a I need to be loud to be heard. So I am going to buy another microphone with better gain.
http://postimg.org/image/qsxoivkqp/
http://postimg.org/image/jhisfwkl1/
http://postimg.org/image/5921hcwbh/
14th December 2015, 06:44 PM |#11  
OP Senior Member
Thanks Meter: 51
 
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Quote:
Originally Posted by ReVolte11

Hi,
so I made some pictures and improvements in my unit. I left my microphone connected in the same way I soldered it, but I shielded the jack wire for it whole length in radio. Now i have no static noises, but my microphone is still weak a I need to be loud to be heard. So I am going to buy another microphone with better gain.
http://postimg.org/image/qsxoivkqp/
http://postimg.org/image/jhisfwkl1/
http://postimg.org/image/5921hcwbh/


Also check your cable resistance just to be sure is ok.
Also cable must be as far possible from board.
Are you using stereo or mono jack?
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bt mod, huifei, huifei mod, kgl mod, mic mod

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