Please Help a noob in a dire situation, 3.5mm jack broken, internal cables unknown!
Feb 23, 2015 at 4:51 PM Thread Starter Post #1 of 6

OmarMostafa32

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Hey guys, 
 
I've always admired this forum for the amount of knowledge present in each and every member on here, so in that sense I came with my really really big problem.
 
I recently bought this Bluetooth car kit off Amazon.com: 
https://www.amazon.com/gp/product/B00GJFGE3W/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1
 
and during one of my drives I accidentally hit the 3.5mm jack while it was plugged so it kinda came loose. So being a DIYer and an Electrical Engineer, I decided to replace the 3.5mm jack with a new cable and also extend it, so I got one of my gold plated audio cables and cut away one of its ends to expose the internal cables which were the normal, Red(Right Channel), White(Left Channel) and GND.
 
http://i.imgur.com/OOKs4Sq.jpg
 
But when I got to cutting open the Bluetooth car kit cable off to expose the inner cables I was presented with a surprise, check this image out to understand what I mean.
 
http://i.imgur.com/pXUGRKx.jpg
 
So how do I go about connecting these two cables together.
 
http://i.imgur.com/W1eLm9V.jpg
 
Thanks a lot in advance guys.
 
Feb 26, 2015 at 2:09 AM Post #4 of 6
I'm just a self taught DIYer so I could be wrong, but it looks like you are replacing a TRRS connector with a TRS connector. In other words, check that the plug you cut off is has the same number of rings as the one you are replacing it with. I suspect that they are not the same number of rings.
 
Note that bluetooth speakers often have a microphone, so 2 wires are for the microphone's signal and ground, the other 3 wires are for L signal, R signal and shared speaker ground. It is common to use TRRS connectors to add a microphone to audio cables using a 3.5 jack, so most likely the plug you are replacing it with is the wrong one.
 
Use a multimeter to do a continuity test to determine which wires should join to which by testing the cut off plug and each of the wires.
 
If you don't use a TRRS plug, then you will have no mic.
 
Feb 26, 2015 at 8:27 AM Post #5 of 6
  I'm just a self taught DIYer so I could be wrong, but it looks like you are replacing a TRRS connector with a TRS connector. In other words, check that the plug you cut off is has the same number of rings as the one you are replacing it with. I suspect that they are not the same number of rings.
 
Note that bluetooth speakers often have a microphone, so 2 wires are for the microphone's signal and ground, the other 3 wires are for L signal, R signal and shared speaker ground. It is common to use TRRS connectors to add a microphone to audio cables using a 3.5 jack, so most likely the plug you are replacing it with is the wrong one.
 
Use a multimeter to do a continuity test to determine which wires should join to which by testing the cut off plug and each of the wires.
 
If you don't use a TRRS plug, then you will have no mic.

 
I checked prior, and the old jack was TRS with 2 rings, same as the one I'm trying to install now, but I can't figure out the wire designations!
 
Feb 26, 2015 at 6:21 PM Post #6 of 6
 
I checked prior, and the old jack was TRS with 2 rings, same as the one I'm trying to install now, but I can't figure out the wire designations!

 


If it has 2 rings in the middle, then it's a TRRS rather than a TRS. TRS stands for tip, ring, sleeve. TRRS is tip, ring, ring, sleeve. I still feel that you should be using a TRRS as there are 2 extra wires there for the microphone

Can you please send a photo of the jack that you cut off as I also want to double check.

Looking at the photo of the one you are replacing it with, you are replacing with a TRS.

To find the wire designations, you have to do a continuity test with a multimeter on the jack you cut off.
 

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