yashsingh1/xdaforums huggingface dataset:
[MTCB Hardware Development] jakejm79:
+1 to Dave's suggestion, the advantage of doing that is that the external mic works with Android now. The disadvantage is that the mic signal can pickup some interference while it routes its way from the front screen PCB to the BT module, but IMO that issue is negligible and I have had no problem with the BT call quality going with an external jack soldered to the internal points.
[MTCB Hardware Development] Lyhaku:
I can confirm the quality of this solution, now the bluetooth calls are OK and I can also use the the external mic for android. It's very clear and without any interference.

I've cut and isolated the internal mic wires. This operation can be done without breaking the warranty sigil.

Thank you.
[MTCB Hardware Development] warata:
I could confirm the same solution too.but there is only one doubt.eitherway warranty will disapears when you replace the seal of screw.
[MTCB Hardware Development] Niko0101:
Sound Problem with incoming calls

Hello and thank you all for great work. This helps me solve many problems!

Till now I did the Hardware Mod for external Mic and I changed the BT to WQ_BC6b in the factory settings. This helps me much and the others side can here me without problems. But the incoming voice in my car is really low. It's much lower than music etc. And sound is now only on the left frontspeaker.

With the WQ_BC6 profile my sound was ok but the others side was Bad. So now it's better but I hope there is a possibility to solve this Problem to.

My Device: JY RK3066 with latest Rom from Malaysk in a VW Golf6

Thank you!

Update: today I realized that with the WQ_BC6b my internal Mic is used! So the quality is only good when the car is not driving. I don't understand why? I already did the external Mic Mod.
[MTCB Hardware Development] rdavidowski:
Hi,

Has anyone done this on a RQ0256. This is the Pumpkin 10.1 HU. I just want to make phone calls crystal clear. Or at least usable. Any photos of the internal mic board that has to be unsoldered will be greatly appreciated.

Thanks
[MTCB Hardware Development] halloj:
Viewed from the front it's in the upper left corner, where your mic is. After you split the case you will find two tiny cables in the upper right corner. Cut them and solder them to your external connector.
[MTCB Hardware Development] Mr Bigglesworth:
Hi all

I am considering doing this mod (wish my soldering skills weren't so bad!) but I would like to use the car's built in mic. I think all I need to do to get the car's built in mic to work is to adjust some of the connectors. I think all i need to do is to add two pins to the white part of the connector this and connect those two pins to a standard 3.5mm connector. The white part of the connector I mean is as pictured in the attached.

Does anyone know where you get these pins from?
[MTCB Hardware Development] Lyhaku:
Hi, I've tried this on my 2011 Nissan Cube Z12, but didn't work. Mycar built in microphone is 12v powered and also has some sort of pre-amp, after connecting it to a standard 3,5mm jack and to the stereo line in I had to give up because the signal was too strong and full of noise. I had to use the stereo external microphone.
[MTCB Hardware Development] Mr Bigglesworth:
I think I have seen a thread a while back where someone did get it to work on the same brand of car as mine, but can't find that thread!

Did you use the pin connectors? and if so do you know what they are called?
[MTCB Hardware Development] Lyhaku:
My car connectors are a lot different from your. In my car connector the mic wires were called Mic Signal, Mic VCC (power +12), and Mic ground. I found the wiring scheme in my car repair manual (downloaded from the internet).

Can't help you sorry
[MTCB Hardware Development] margaldi:
I am planning to do the mic mod this weekend on my EONON GA5150 HU. At same time I have decided to improve the WiFi reception by extending/replacing the short wire the is attached on to the board.

I have several cables and connector lying around in my garage, but not sure which wire will give best result.

I have an antenna from an old portable DVD/TV that features a shielded cable and ends up with a nice 10cm antenna that I could fit somewhere behind the dash. I am also thinking to add a connector so that I can detach the antenna to make HU extraction easier.

I am not sure if this type of cable will do the job (and also if including a connector will affect the result).

Any suggestions are welcomed!!!

Also do you recon removal of the wire already soldered of just to solder the new extesion on the existing wire?
[MTCB Hardware Development] halloj:
SMA-connectors are good enough. Low price and good quality. The problem to fit a new cable might be not to melt

the inner tubing when you solder the shield. On the other hand if the already existing cable and your TV cable do have

different impedance you will lose range by mismatching. I would go for a new thin 50 Ohm cable. Careful soldering and

checking for short before you solder the cable to the SMA would be good enough.
[MTCB Hardware Development] margaldi:
Successful BT mic mod and fix of WiFi signal

Thanks for advice. After some search, I found an old WiFi receiver in my house and removed the antenna incl. the 10cm cable fitted on. I finished the mod with 100% success. Although my soldering skills sucks, the end result is very good considering my 1st DYI attemp in electronics. Both BT voice calls and WiFi works much-much better.

As soon as the forum "allows" posting of photo from newly joined members, I will post some photos from the process.
[MTCB Hardware Development] margaldi:
Have made a description of the modification process with some photos. Mod applied onto EONON GA5150 android headunit for BMW 3 series E46 cars.

http://forum.e46fanatics.com/showthread.php?p=16987581#post16987581
[MTCB Hardware Development] krilan5:
summary

friends,

I'm owner of the unit car kit (for BMW, MTCB-KGL-V2.80) bought from aliexpress.

What will be the simplest way make the hand free (BT) quality better - cut the internal MIC?

After the mod the stock mic is enough? Any photos where I find into unit the internal mic.

Unfortunetly I can add photos of the unit.

Thanks in advance.
[MTCB Hardware Development] dafior01:
Please correct me if I get it wrong. I understand that ground on wire (lets call it: "-" ) is soldered on the jack socket and to chassis, yes? Not with any ground point on PCB?

On picture "connect_back_panel.jpg" I can not figure out. I can see only soldering to the jack socket "-". And on opposite end of wire (connect_wire_to_BT.jpg) looks that "-" is not soldered anywhere.

PS. I Have Klyde (KLD6), and believe your idea help me with quality of BT Hands Free.
[MTCB Hardware Development] roscored1000:
I have been reading as much as I can about the mic issue and slowly going crazy. I am looking for an easy fix though I have added a better wifi antenna by soldering new SMA connector and external antenna. The mic supplied is 2 pole and there looks to be only 2 cables from the back block connector to the Jack, Can I safely assume then that the mic is 2 pole? I cant pull it out of the car to check due to weather constraints. Pumpkin has sent me replacement mic which is 2 pole but I saw a reference here that it may be 3 pole? Anyone?

Also I have included photos of my BT Module and the connections for my internal mic. Does anyone know whether this module can be modified and how [link] as it doesnt have the c32 connection. Thanks
[MTCB Hardware Development] margaldi:
Can you post close up photos of the front and back of your BT module card. In your unit I think the equivalent of our c32 is the c107 but your photos are not clear. As far as the mic, I had a 2 wire, 1 goes to mic+ and 2nd goes to GRD.
[MTCB Hardware Development] roscored1000:
I have seen on page 7 info about changing the settings for the BT module. My firmware is MTCB-KLD6-V2.81 and the default bluetooth setting was WQ_BC6B others have had the WQ_BC6 as default. Below is a photo of the drop down box to show what supposedly is available to me[?]

I was wondering if the default setting should go back to BC6 or some other.

The software is stock by the way.

Thanks
[MTCB Hardware Development] roscored1000:
Not sure if these will be clear enough.

No the others are a bit too blurry and the unit is back in the car, hope this helps. as for the mic wiring thanks, the mic plug is able to turn quite easily in the jack but maybe the software change will be the easy fix:fingers-crossed:

:fingers-crossed:
[MTCB Hardware Development] margaldi:
No good resolution photo. You need to check which smd is linked to your mic+. In my unit Eonon was c32. You either remove (desolder) the smd or cut the leg of the mic+. There is extensive description of these mods in this thread and others relevant. If you are able to solve by software changes is best to avoid all the hassle
[MTCB Hardware Development] roscored1000:
ok thanks I am not too keen to do hardware mods as there are so many different variations to these devices I may have a slightly different one and kapow no more BT. cheers
[MTCB Hardware Development] Lyhaku:
no need to modify bluetooth module

In my experience the solution to bad mic quality is to just cut and isolate the wires of the frontal mic, the 2 wires in the second pitcture you posted.
[MTCB Hardware Development] roscored1000:
So have no front mic? But is there any guarantee that the external is actually working? If it isnt then you have no mic? Or did I miss something? Thanks
[MTCB Hardware Development] Lyhaku:
No front mic. But you can user the external mic for all functions, android apps, bt calls etc..

The external mic provided with my unit (Pumpkin 1024x600 quad core RK3180 android 4.1) works perfect.
[MTCB Hardware Development] margaldi:
I know I am also not a skilled solderer but had do fix this thing as it was too annoying
[MTCB Hardware Development] krilan5:
hi,

Before start with hardware modification I try with that, went factory settings my BT was set SD-BT, I changed it to WQ-BC6B than the unit was rebooted

Now have the situation that can't even connect to BT, the unit can't see my mobiles:confuseded: What is going on?

On mobile I can see the unit even can pair.

The same situation is when back to old settings SD-BT

EDIT: I have checked it again when back to SD-BT and run car again, all back (paired divaices) . Can somebody explain to me the situation?

It seams that only hardware modification left.

Friends my problem is solved (even supplier of the unit offered new BT module), the internal mic is cut and the quality during a call is really good (is confirmed by few persons)
[MTCB Hardware Development] solmer:
JY-UL135

Hi! I've a new unit on the way, a JOYING JY-UL135 and I wanto to go ahead with the MIC split before mounting the unit in the car but I don't know how to do it on my radio. Capacitor desoldering? Resistor desoldering? Cut a track? I've been searching throught the posts but I can't find the info. Any ideas? a picture could be great !!!!

Thanks in advence.
[MTCB Hardware Development] krilan5:
If you are not going to use internal mic, the simplest and fastest way is desoldering the mic (2 wires)
[MTCB Hardware Development] Mr Bigglesworth:
I've just scanned this thread after not reading it for a while, but now am a little confused.

People seem to be completely desoldering the front internal mic - but I thought this was needed by android for any voice recognition or activities for android apps??
[MTCB Hardware Development] krilan5:
Depend what is needed, I simply need working well hand free call, not need internal MIC
[MTCB Hardware Development] Mr Bigglesworth:
OK, but I take it that if you open google voice and give the command (for example) "navigate to home" it would not recognise that anything had been said?
[MTCB Hardware Development] halloj:
Since normally both microphones unfortunately are in parallel , removing the front one does no harm. The other one (external) will take over

everything. This means that you leave everything else intact. I.e. no removal of capacitor and so on.

Being in parallel is a design fault since one will pick up noise while using the other one. The factory front mic is of very low quality

and exchanging that for a higher quality outside mic will improve the whole enchilada.
[MTCB Hardware Development] Mr Bigglesworth:
Oh I see what you are saying, so actually the external mic would work for android apps...

If suppose for those not keen on soldering you could even just cut one wire on the mic and electric tape over the connection to disconnect it.
[MTCB Hardware Development] halloj:
I did that on one of my Pumpkins, works perfect. That unit did not have an external mic, so I connected an external to the cut wires

of the internal.
[MTCB Hardware Development] solmer:
Hi ! Krilan :) Thank you so much for the info, now I know what to do...much better than taking apart or desoldering the cap.

:good::good::good:
[MTCB Hardware Development] fma965:
I have a Eonon GA1312 aka a KLD 1 din unit, It has a internal microphone but it's wired only for BT not for internet actions such as google search etc. Is there any way i can rewire this for internal functions such as google search etc and then use a cheapo external 3.5mm microphone for bluetooth?

this is what i got as a reply from seller

Me: Hi as you know i brought this device recently GA1312... but the internal microphone doesn't appear to be working correctly, no voice commands or applications seem to be able to use it. it does work for phone calls when connected to another device, any suggestions?

Them: About the microphone, pls check the external microphone will work or not. And pls note that our unit doesn't support voice commander.

About Bluetooth, could you pls tell me what "another device" have you connected which makes you can not give a call?

Me: Hi there isn't an external microphone on this unit. nor a connector to plug one in. by voice commands i meant things like Waze voice commands or google now voice commands.

Them: Sorry to tell you that our unit doesn't support voice commander.

Except the voice commander, is the microphone can work properly? If microphone cannot work in all situation, kindly suggest you return it back for return/replacement, we need to test it to figure out the reason. Thank you.

Hence why i want to mod this my self to make it work.
[MTCB Hardware Development] TT_Vert:
There has to be a spot for an external mic for BT. I think the external also was needed for voice command.

Dave
[MTCB Hardware Development] Pedaaa:
Does anyone know, if those mods would work the same on MTCD head units?

Or did they improve/change something on the hardware for those newer units?
[MTCB Hardware Development] solmer:
Hi ! I've a JY-UL135 (MTCD) and I can confirm that de-soldering the internal MIC (only one wire) I can use Bluetooth and the voice is clear as it should be. Ok google works like a charm, no more voice issues.....
[MTCB Hardware Development] Seichobob:
hi everybody,

ive read all the 15 pages of this thread. i got my naviskauto c0255 on weekend and i have to say that the internal mic is crap, the external doesn't work. someone wrote in here that both are parallel. i cannot confirm this. i can say google commands to the internal mic and i can have bad phone calls if i want but the external mic (mono jack) doesn't do anything.

do i get it right: i should now cut the red wire of the internal mic and just plug in an external one?

if someone is interested in it... i tried to get in contact with a guy called "Naviskauto" on facebook. he told me that i should have a look on this page. here, we have a guy called "jammy". he's a member of Naviskauto staff.

http://www.autopumpkin.com/forum/viewtopic.php?f=3&t=171&start=90

he also mentioned that the best would be to cut off the internal mic but i am afraid it won't work.

is there anybody out here with the same unit that i have? a late 2015 C0255, actual running booroomdook's android 5 rom...???

would be great to get a final advice!

thanks...
[MTCB Hardware Development] Pedaaa:
How do you know, that the external mic doesn't do anything?!

But anyhow..

Yes, just cut or desolder the internal mic and connect the external mic at its standard connector.

This worked great on my MTCB and on my new MTCD as well
[MTCB Hardware Development] Seichobob:
Hi Pedaa,

easy to explain:

I calles someone via bluetooth and i had the external mic WHICH WAS INCLUDED IN THE PACKAGE (Mono Mic) connected in the back jack of my HU. The caller said that he hardly understand me and the car was not rolling. Then i talked directly into the external mic, nothing changed. I get closer to the internal and it was a little bit better but still bad. I took a cable extension for the external mic and went outside the car, the caller did not here anything! I went back into the car and put my finger on the internal, nothing. I tested, believe me, all scenarios and i am 100% sure: both mics were connected BUT only the internal works. They are not parallel.

I will cut now the red wire of the internal mic, i can not desolder, am not that technical. I hope that:

1. If i cut the internal, EVERYTHING (calls, google voice etc) will work with the external Mono mic which was in the package.

2. I change the external mono mic (because the cable is too short) to and external stereo mic from pioneer with a 3 m cable. I hope that it will not make any differences...

Can you confirm this all?

I can take a foto tonight of the unit, i hope that someone can confrim that all my problems are gone when i cut the internal mic... i want to be 100% sure because i am loosing warranty...

Thanks...

Sorry for my bad english explenations :)
[MTCB Hardware Development] Pedaaa:
Oh, i never tried to test the external mic in that way.

But i would try the mod anyhow. If it wont work, there might be a problem with the internal wiring of your ext. mic.

But this is no tragic. There is still a second solution: you could solder a headphone jack to the wiring of the internal mic (that you have cutted before)

And connect your ext. Mic there.

I am sure you will find someone that could do this soldering for you. Its really not a big deal
[MTCB Hardware Development] Seichobob:
Pedaa,

i thought i should now just CUT the red plus cable of the internal mic, connecting the external an everything is done???? Now you write:

Do you mean the mod in this thread with all that C102 connectors and stuff O R do you mean cutting the cable as mod? Really, im a noob in eletronics, i cannot find any connectors, cannot solder a cable and so on. All i can is taking a scissors and cut a red cable. Thats it. BUT: good to know if it DOES NOT WORK that i have the chance to ask a friend if he can solder me a external mic at this point were the internal was... right?

These are the next steps:

1. I will cut the cable

2. I will connect the original external mic, if it works i will connect the new bought pioneer stereo mic (because of the longer cable)

3. If this not works i will ask someone to solder the pioneer mic to the connection where the INTERNAL MIC was

4. If this also not work i will cry ! I will report anyway...
[MTCB Hardware Development] Pedaaa:
Sounds like a plan. Yes.

But this should work. Why not?! Maybe your ext.mic wiring is faulty. But your internal works. So if you solder a better ext. Mic there, it will also work. (Only better)
[MTCB Hardware Development] Seichobob:
No, the ext. Mic wiring is not faulty. I tested the external mic on my computer, works like a charm. It is a fact that my head unit has this behavior. others with the same unit were reporting absolutely the same. Always ONLY internal working, no external! I will try what i have planned and post the results, thanks a lot so far...
[MTCB Hardware Development] Seichobob:
I am desperate! Nothing works :(

First i unsoldered the internal mic as you can see on the pictures...

After that i connected the external mic (which was included in the package - it's a MONO mic) to the external jack. Nothing happens, the mic doesn't work!

After that i tried to solder the external mic to the internal solder points:

Unfortunately also nothings happens, the mic doesn't work BUT i am not sure i i soldered it correctly, this was my first time. Pedaa said if nothing happens when i unsolder the internal mic i should solder the cable-mic to the internal point... no idea why this dont work :( I expected that wehn i unsolder the internal one, the external jack should work automatically. In my HU, the external jack (2,5mm) is a cable included in the cable where the two usb ports are BUT when i have a closer look to my HU, i dont undersant this:

The jack socket comes out of a cable where also USB/3G is, connected to "F" in the HU unit. On this pic on the back of the unit there is NOTHING written aout a microphone... BUT i can see the socket to connect the external mic.

Did i do anything wrong? Should i have only unsolder the RED wire of the internal? I unsoldered both, red AND black...

I am totally confused now, no idea what i should do. Maybe i have the socket for the external mic but inside my HU there is nothing connected?

Hope anyone can help me with an idea or an explenation for all this :(

Thanks
[MTCB Hardware Development] Pedaaa:
really strange.

Are you sure, you didn´t interchanged red and black connections?

Are you sure, both wire leads don´t touch each other?

If so... i can only think of those:

- maybe your unit has some special internal mic, that works way different than usual mics (but i don´t think so)

- or your 2,5mm (or 3,5mm?) female jack itself is faulty. I have already seen some chinese headphone jacks of really bad quality. So that the pin is very loose inside the jack, not even making a click if you plug in. If so, you might have no connection at all.

Have you cutted the plug off your mono-mic and soldered wires with wires?

Or have you soldered a jack to the internal mic connections, and plugged in your ext. mic?
[MTCB Hardware Development] Seichobob:
Are you sure, you didn´t interchanged red and black connections?

yes, i am...

Are you sure, both wire leads don´t touch each other?

yes...

If so... i can only think of those:

- maybe your unit has some special internal mic, that works way different than usual mics (but i don´t think so)

i also don't think so...

- or your 2,5mm (or 3,5mm?) female jack itself is faulty. I have already seen some chinese headphone jacks of really bad quality. So that the pin is very loose inside the jack, not even making a click if you plug in. If so, you might have no connection at all.

i can hear a click, it looks good.

Have you cutted the plug off your mono-mic and soldered wires with wires?

yes...

Or have you soldered a jack to the internal mic connections, and plugged in your ext. mic?

This is what my next plan is. the best would be to buy something like this:

https://www.amazon.de/Klinken-Ansch...36&sr=8-1&keywords=buchse+klinke+offene+enden

then i can connect i new external mic... but... the mic is MONO, only two cables... and the amazon socket is stereo... means i just don't use the white cable ???

thanks for your help... :(

---------- Post added at 03:27 PM ---------- Previous post was at 02:57 PM ----------

mmmhhhh.... did i make the mistake to desolder BOTH CABLES ?? Black and red? Should i ONLY cut the red line of the internal mic so that the external will work???? Maybe this is the answer?
[MTCB Hardware Development] Pedaaa:
No, black is just ground. Would not make any difference, if you cut both or just red.

To be honest, if you have checked all those things, i am also out of ideas. Maybe someone will answer, who had similar problems.

Ordering this amazon cable will not make any difference either.

Last idea i have, would be soldering directly to the Bluetooth module, and remove this pin 4?! C32 or whatever... Please post a photo first. Then maybe someone could confirm, which are the correct connections for your specific model

Edit:

Check last post on page 10:

User "Lyhaku" also has the C0255 model, and it did work for him. Maybe you can send him a message, asking, if he did something different