[How To] Add Internal Qi charging While Retaining NFC

burnski

Senior Member
Mar 9, 2013
450
138
0
WARNING: I am not responsible if you break your phone. Proceed at own risk!

So I have received a ton of questions regarding how I added Qi to my phone, and its sort of scattered throughout this thread so I decided to edit the OP and lay it out step by step.

Here are the parts I used:

GalaxyS4 charging card: http://www.ebay.ca/itm/331536120289
LG G3 coil combo: http://www.ebay.ca/itm/261756381973

You will need both becase the S4 card does not include NFC, and the G3 card does not include the Qi PCB circuitry.

power down, remove sim, remove battery cover, remove lower speaker module. you can find how this is done here: https://www.ifixit.com/Teardown/OnePlus+One+Teardown/26484 (you do NOT need to remove the upper cover nor the battery. just the back cover and lower speaker assembly)

Solder wires to the outside pins:



Route the wires into the battery cavity, replace the speaker. Here is the wiring diagram of a Micro-USB cable. Since the OPO is laying face down, this image would have to be "inserted" into the plug on the OPO then flipped so the narrow part of the plug faces up. The +5 pin ends up on the right like in my photo above.:



Remove the paper from the S4 card, cut out this part. Be sure to take note of which trace leads to the "outside" and "inside" of the coil:



and solder the wires from the micro-USB port to the coresponding pins marked on the S4 PCB (on the right side in this image) +5 & GND. I used a small piece of thin 2-sided tape to stick it to the battery.

Also follow the traces in the PCB for the Qi coil side. On the left side of the PCB I added a red wire to the trace that goes to the outside of the coil, and a black wire to the trace that goes to the inside of the coil:



I then removed the G3 Qi/NFC coil from its paper backing, and cut to seperate the NFC from the Qi traces. I just cut along this gap:



Next just align the POGO pins on the OPO to the NFC pins on the G3 card:





I "accordioned" the NFC traces so that the coil will sit higher / more central on the rear of the phone. Use 2-sided tape to hold it in place.

Then take the leads you soldered to the coil side of the S4 PCB board and match the red to the lead that goes to the outside of the G3 coil.



Carefully stick it all down to the battery. Here is the finished install:



Now just remove the NFC coil from the inside of your back cover. I also removed the sticker from the inside of the styleswap cover (only exists on bamboo - does not exist on the black or white covers). I also sanded down the plastic ledge around the location of the OEM NFC to free up a every tiny bit of available space:



and close everything back up. Mine fit perfectly flush with the bamboo cover:




Done!

I have an LG WCP-300 Qi charging puck. It has a rated output of 1000mA. It looks like this:



and I consistently get 850-900mA while charging:




NFC works exactly like stock, the Micro-USB port also works exactly like stock. I can still charge over micro-USB and get the proper 1800mA charge rate while using it.

Any questions just let me know!
 

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abhi08638

Senior Member
Jul 11, 2012
2,167
4,386
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So it sat on the charger all night. Warmed up to 30°C as it approached 100% Ruth cooled back down to 28.
Thanks! How long did it take to get a full charge

sent from my amazingly awesome OnePlus One with Stereo Mod

Don't forget to hit thanks!
 

cgjjaf

Senior Member
Jun 25, 2010
193
53
48
So for two years I loved having wireless charging with my nexus 4, and the lack of it with the OnePlus One was the only shortcoming I settled over. I finally got tired of going without it, so decided it was time to do something about it. I had a spare qi receiver for a Samsung s4 kicking around so I decided to open up my opo and perform surgery. It was a success and I can finally bid farewell to the loose cables laying around again!

Note that with the screen off it charges at approx 460mA. Sure it's not as fast as the stock charger but this is about convenience not speed. If I'm in a hurry I can still use the stock charger for a bump... But the reality is that my old n4 was always fully charged because whenever I sat it down I sat it on a charger.

Edit: so it's spent the night in the charger and I found something interesting according to the battery monitor widget log.

I put it in the charger at 11:45pm with 28% battery remaining. It charged at a rate of approx 875mA and by 1:30am it had reach 80% battery. Then the battery rate of charge dropped to approx 100mA until it reached 100% at approx 6:00am.
This looks like a great mod, would you mind putting specific instructions on how to do it? I can get the idea from the pics, but I don't want to mess anything up. Thanks.
 

Lupercal

Member
Jul 23, 2010
26
2
0
I just switched to a OPO from a Nexus 4, and wireless charging is the only thing I miss... well, and Seidio cases and holsters; I really like their products.

Anyway, couple questions about your mod; do you think copper tape would work? I'd prefer not to do any soldering. And, does your coil interfere with NFC function?
 
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adas1223

Member
May 11, 2011
27
3
0
I put an s5 qi charger in mine. 750-800mah screen on. Screen off approximately 15-20% per hour. The NFC blocks alot of the potential. Maybe place your coil between the antennae and the back cover.

Glad to see people are not afraid to tear apart their opo
 
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burnski

Senior Member
Mar 9, 2013
450
138
0
I just switched to a OPO from a Nexus 4, and wireless charging is the only thing I miss... well, and Seidio cases and holsters; I really like their products.

Anyway, couple questions about your mod; do you think copper tape would work? I'd prefer not to do any soldering. And, does your coil interfere with NFC function?
I actually bought the white style swap back that doesn't have the nfc. I honestly have no use for the nfc coil so that buys me 1-2mm of space.

If I do find I need nfc down the road I'll buy the lg g3 qi/nfc combo coil and swap it out.
 

barrmulio

Senior Member
Oct 5, 2010
357
359
0
Has any tried to get a charger with the micro usb between a case (diztronic) and the back?

I'm a bit worried about ruining the sandstone so i may get a generic cover
 

adzidek

Senior Member
Nov 15, 2010
560
81
0
Toronto
So for two years I loved having wireless charging with my nexus 4, and the lack of it with the OnePlus One was the only shortcoming I settled over. I finally got tired of going without it, so decided it was time to do something about it. I had a spare qi receiver for a Samsung s4 kicking around so I decided to open up my opo and perform surgery. It was a success and I can finally bid farewell to the loose cables laying around again!

Note that with the screen off it charges at approx 460mA. Sure it's not as fast as the stock charger but this is about convenience not speed. If I'm in a hurry I can still use the stock charger for a bump... But the reality is that my old n4 was always fully charged because whenever I sat it down I sat it on a charger.

Edit: so it's spent the night in the charger and I found something interesting according to the battery monitor widget log.

I put it in the charger at 11:45pm with 28% battery remaining. It charged at a rate of approx 875mA and by 1:30am it had reach 80% battery. Then the battery rate of charge dropped to approx 100mA until it reached 100% at approx 6:00am.
does it matter which pin gets the black and which pin gets the red? I'm looking at an S5 coil that i want to adapt to my OPO, but that coil doesn't identify red/black...