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[MOD] T-Mobile Note 2 wireless charging mod

OP vinas1

7th November 2012, 02:38 PM   |  #1  
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This is a fork of the original N7100 Note 2 wireless mod thread found here:
http://forum.xda-developers.com/show....php?t=1951493

The purpose of this thread is to determine why the wireless charging pins on the T-Mobile Galaxy Note 2 (SGH-T889) are not working after installing the MOD above.
Please view the thread above for more details about the original MOD, and to see what you need to do first in order to continue with the work around below.

Updated method on 8-5-2013: Thanks to SGBE

The updated method has a better solder point. See that thread OVER HERE.


Results:


The Work Around: (verified working on multiple devices)
We have a mod to make wifi charging work! Regardless if the T-Mobile GN2 is missing hardware or not, the work-around is a low cost (free?) alternative to get wifi charging working. Our work around involves soldering a small wire to a tiny point on the micro usb board. You should be able to solder a very small connection (about the size of a pen tip) before attempting this.
The mod/workaround below is verified working with the stock charger and stock kernel. <- Pay attention to that last bit.


Workaround Known Issues:
Some kernels have a charge rate which is set too high for the PALM PRE Touchstone to work with. Likewise, some non-oem chargers can not deliver enough amperage to continuously charge the device wirelessly through the Touchstone. Therefore, if you have any problems (disconnect/reconnect proble), be certain that you are using a stock charging rate (kernel controlled) and a stock Galaxy Note 2 Charger (2,000mA). If you are still having problems check your mod for trouble, and finally post up and maybe someone can help you.

The Mod / Workaround:
(also attachment #3 on the list below)







The full work around post is on page 3
.

New Information:
If you have new information on a hardware or software fix then it will be added here. Until that time, proceed with the workaround at your own risk. Once again, the work around instructional image is HERE.



WARNING: What was claimed to be a fix in the section below did not work, and ultimately people wasted money on bogus hardware. It is here for historical reference.

The Fix
You may need to purchase some missing hardware.

See page 7 for details (you need to replace the flex cable and micro-usb board): http://forum.xda-developers.com/show...7&postcount=65 The SKU number for the board is MBRPSS964.

(the false wifi charging image is only attached for historical reference)







Picture legend:
  1. Sprint GN2 chip (the chip is missing on T-Mobile's version)
  2. Sprint GN2 pin pads
  3. Wifi Charging work around instructions
  4. Completed work around example.
  5. alternate view of work around charging pin
  6. alternate view of work around +5vdc source
  7. Picture of the wi-fi fix working (reported that this may be a fake!)



Older info:
Some steps that I've personally done:
Completed the wireless mod above, confirmed wireless voltage reading of 5.56vdc.
Tested continuity between USB positive, and wireless positive - no connection.
Tested continuity from the negative wireless charging pin to the negative USB, SIM slot, various screws - they are connected.
Jumped the positive post on the USB to the wireless charging positive pin, the phone charges but is not practical to have a wire hanging out of the USB port.

I plan to pull apart the phone and check the paths from the positive and negative ports on the wireless pins. Attached is a picture from a SPRINT GN2 that does not have the pins, but supposedly works for charging once contact is made with the pads. I'm going to be using this to compare the circuit against my T-mobile version.
Attached Thumbnails
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Last edited by vinas1; 8th August 2013 at 10:14 PM.
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7th November 2012, 03:39 PM   |  #2  
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I hope you find something with this in the next few days when the full dis-assembly takes place
7th November 2012, 03:44 PM   |  #3  
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Quote:
Originally Posted by vinas1

Tested continuity between USB positive, and wireless positive - no connection..

Now this makes sense. Because if both wireless and usb charging connections were directly connected together, the phone would have no way of knowing which charging system you were using. But we know from the tests on the international version that it does know. So this in no way tells us that positive is not connected at all.

Even though the phone doesn't detect wireless charging at this time in software, has anyone tried leaving it on the wireless charger to see if it still charges the battery?
7th November 2012, 04:37 PM   |  #4  
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Quote:
Originally Posted by xamindar

Even though the phone doesn't detect wireless charging at this time in software, has anyone tried leaving it on the wireless charger to see if it still charges the battery?

I did this too, and waited for a while (waiting for the battery to drain on this phone is like trying to suck the ocean dry) - after a long time of playing video it dropped by 1% while on the wireless charger.
7th November 2012, 04:47 PM   |  #5  
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Quote:
Originally Posted by vinas1

I did this too, and waited for a while (waiting for the battery to drain on this phone is like trying to suck the ocean dry) - after a long time of playing video it dropped by 1% while on the wireless charger.

So wait....does the T-Mobile version of the Note 2 actually charge on the wireless charger? or does it NOT charge?
7th November 2012, 05:40 PM   |  #6  
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Quote:
Originally Posted by elite-fusion

So wait....does the T-Mobile version of the Note 2 actually charge on the wireless charger? or does it NOT charge?

It does NOT charge...

Sent from my SGH-T889 using Tapatalk 2
7th November 2012, 05:55 PM   |  #7  
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Quote:
Originally Posted by farfromovin

It does NOT charge...

Sent from my SGH-T889 using Tapatalk 2

Got it. Well I hope the OP can figure something out Would be great feature to have the T-Mobile have it.
7th November 2012, 07:37 PM   |  #8  
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Quote:
Originally Posted by elite-fusion

Got it. Well I hope the OP can figure something out Would be great feature to have the T-Mobile have it.

Yeah, I dont see any options other than soldering to the micro usb. It wont register as "wireless charging", but it'll work.

Sent from my SGH-T889 using Tapatalk 2
7th November 2012, 07:40 PM   |  #9  
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Well that would be the last resort of course, but I hope that some dev or vinas1 can figure something out at least, this is one of the best features in my opinion
8th November 2012, 05:30 AM   |  #10  
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Subscibing... Stupidly ordered a wireless charging kit for the 7100 ASSuming that it would work for the tmob gn2, then noticed this thread ... DOH

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