04-23-2016 01:08 AM
57 123
  1. Will Gilliland's Avatar
    I just added wireless charging to my 640 LTE. It requires torx screwdriver, soldering skills and little patience. See pictures below.
    I finally got around to doing this modification to my 640 (AT&T). Your guide was very helpful.
    My Qi receiver tag was opposite. I put the tag on a Qi wireless charger to read with a DVM and marked + and -.
    Like Papek said, remove the screws marked in red with a Torx #5. The sticker hides one of the screws. I went ahead and removed the entire sticker since it's very brittle and you'll need that space anyway to thread the wires through.

    I used an old USB cable for the wires, also. If you do use the wires from a USB cable, be careful of the hair-like shielding wires that tend to break away. You don't want these falling into your phone.

    Carefully open the case from the right side and note the camera and data connections. I used curved tweezers to remove the connectors. You will be removing 4 connectors.

    Remove the PCB carefully. Again, I used tweezers. As Papek noted, it is held in by fragile plastic ears.
    Solder your wires on as shown and thread through the slit where you removed the sticker for the hidden screw.
    Click image for larger version. 

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    After reassembling, I notice my PCB didn't fit flush. There are some leaf spring connectors that do push up the PCB some, but this is too much. The issue was my wires were a little too thick and I had to trim away a little plastic around feed-through slit.

    I left my wires a little a little long to allow me position the tag in the sweet spot.

    It's all back together and works great. If I were to do it again, I would have used slightly thinner wires. I also made a bonehead move and tried to solder without flux the first time. I was afraid I created cold solder joints so I went back and resoldered using flux and I got the stuck lid off the dang jar of flux. Also, I couldn't find my electrical tape. When I get a new roll, I'll cover up the slit by the hidden screw better and position the tag a bit better.

    Thanks for pioneering this, Papek.
    Papek_SVK likes this.
    01-22-2016 05:17 PM
  2. Papek_SVK's Avatar
    Hah, another daredevil on the scene! Yesterday I tested Lumia 640 with DT-910 charging stand and it works with no issues. So if you place the coil in same place like I did, it should work fine.
    Or to be more precise, bottom edge of the coil in my L950 is placed 38 mm from the bottom and it works great too. Too bad (for the others) that MS didn't include wireless charging itself.
    01-26-2016 06:27 AM
  3. netmann's Avatar
    hi i have ever tried out the assignment of the pins . I do not know whether it is right and can not even try ... no lumia phone (but next week :D) about the GND i even havent find in the schematic some about, but should be right. sry bad englisch (mother tongue german) maybe some one try it out or can add / rectify a bit...Attachment 120653
    SECOND PIC IS FROM 640XL!!!! (wc11.jpg)

    Attachment 120654
    Susanne1188, Thank you for this lead.

    If you have the complete schematic diagrams of Lumia 640, would you mind post it on this thread or post a web link?
    01-29-2016 07:34 PM
  4. higonp's Avatar
    I used your guide. Thank you very much. I would add for those not very versed in soldering the method I used was to tin the wires, I did this by putting a little flux on the wires (one at a time) then applying the solder to the tip of the soldering iron (a little molten ball on the tip of the iron) I then then touched that to one wire and then repeated on the other wire. Then I did the same on the pads on the logic/motherboard for ground and pos+ I used a toothpick to apply the flux just to the pads I then put more solder on the tip of the iron and touched the pad on the board and the solder went right into place. Then I took my ground wire and lined it up with the pad and with the soldering iron tip completely clean I touched the wire and the solder on the pad and wire instantly liquified and I removed the soldering iron cleaned tip and repeated for the pos+ wire. The contact with the pads on the board while putting the solder on the pad was about a 1 second and then when applying the wire was about the same so with this method heat to board is very fast and limited.
    From previous experience working on other phones plan your attack with the iron to avoid all the little resistors,inducers, fuses chips or whatever on the board and make sure the tip hits only what you are aiming for. Also the best direction in my opinion for the wires was straight toward the bottom of the board almost exactly as pictured in Papek_SVK photo's. I used a dremel tool to cut about 1/3 of the flange away from the black plastic housing where the screw comes through, that flange on the housing will be directly adjacent to where your pos+ wire is soldered on and will prevent logic/motherboard from closing back down flush during reassembly (double check that you are cutting the correct side of the flange away before you cut). I also used curved fingernail clippers to clip away the little plastic ribs (stiffeners) that Will Gilliland posted pics of on his phone on page 3 of this thread. After reassembly I tinned the other end of the wires and attached them to the appropriate pads on the wireless receiver ( the pos+ and ground were marked on the original wire/ribbon cable, so I marked the the pads on the receiver before I cut the original wire/ribbon cable off. My phone housing to logic/motherboard and then to screen fit were all perfect on reassembly so if something is not fitting perfectly then something is wrong don't force it, re-examine your work fix the problem and try again :)
    Thanks again for the guide and I hope what I added is helpful to someone.
    Last edited by higonp; 04-17-2016 at 06:29 PM.
    04-17-2016 06:13 PM
  5. higonp's Avatar
    Flange partially removed and ribs/stiffeners snipped away.

    solder on pads.

    wires easily attached to pre-soldered pads.

    Should fit like this after reattaching board to housing.

    Last edited by Guytronic; 04-20-2016 at 05:06 PM.
    04-20-2016 04:54 PM
  6. mortici's Avatar

    I also check my L640 to install the wirless charging (the qi pad from L920).
    I found also the 4 pins under the sticker.
    Have anybody the service schematic for this Lumia?
    Is it similar to the pins at the L640 XL?

    Attachment 120601

    Looks like its already configured to do it, just the connector pins aren't soldered on. I will see if I can find a source for the pins they use, I think they are similar to that of the Lumia 735, solder the pins on, now you got external contacts, find the proper 4 pin pad tape to inside of case and voila no wires. But the alternate options here work too.
    04-22-2016 12:20 PM
  7. mortici's Avatar
    Looks like the Lumia 820 has a 4pin flat contact qi pad on the inside of the case. Now to find the pins that are used in the lumia 735/950 that are soldered on the board and poke through to make contact with the back cover. Need 4.

    Combine the two parts (after trimming some of the pad to fit the 640 shell) and you have yourself a wireless charging back ☺

    Granted the methods here are cheaper albeit not pretty...

    Posted from Windows Central for Windows 10
    04-23-2016 01:08 AM
57 123

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