06-06-2016 08:46 AM
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tools
  1. sadude69's Avatar
    I bought something similar but the price was like $20 on ebay
    04-19-2015 10:00 PM
  2. theboomr's Avatar
    Hey! I messaged you on eBay a few weeks ago about potentially doing the mod if I sent in the international case to you, but you never got back to me if you'd be able to do it, although I did link you to this thread. Any chance of you being able to do that? If not, I'm trying to recruit my friend to help me out with this, since I'm no good with soldering lol.
    04-27-2015 06:12 AM
  3. John Sevinsky's Avatar
    Here's my Qi charging solution. I didn't want to open the 1520, so I took a generic Qi charger (one that plugs into a micro USB jack), cut the USB plug off, stripped the tips of the wires, crossed them, and taped them onto the left & center pins on the back of the phone. (Nothing is attached to the right pin.) It seems to be working OK. I have the phone in a case, so you don't see any of this.

    img_9550.jpg
    05-21-2015 09:51 PM
  4. GrayW0lf's Avatar
    That's an interesting variation on the ideas presented on this thread. How's the heat with that charging solution?
    05-22-2015 01:58 PM
  5. MDK22's Avatar
    Here's my Qi charging solution. I didn't want to open the 1520, so I took a generic Qi charger (one that plugs into a micro USB jack), cut the USB plug off, stripped the tips of the wires, crossed them, and taped them onto the left & center pins on the back of the phone. (Nothing is attached to the right pin.) It seems to be working OK. I have the phone in a case, so you don't see any of this.

    Click image for larger version. 

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    So, the orientation of the charging tape is important - you crossed the wires, why not simply flip over the charger (have the print facing in)
    I'm intrigued by this simple solution, hope it continues to work, keep us in the loop ... I also have mine in a case, I might (attempt to) solder those wires to the contacts, after it's proven to work!

    @SonarTech - I'd love to hear what you have to say, since you seem to be expert @ this - will that work, long term? I know next to nothing about this, but would love to have wireless charging back & THIS, I could do.
    Harrie-S likes this.
    05-22-2015 06:45 PM
  6. John Sevinsky's Avatar
    I tried flipping it over, but apparently there's some sort of shield on the back side of the coil, and it didn't work. I did not solder the wires. I just bent the tips down and taped it to the back of the phone.

    It gets warm, but not very warm.
    GrayW0lf likes this.
    05-22-2015 07:05 PM
  7. MDK22's Avatar
    I tried flipping it over, but apparently there's some sort of shield on the back side of the coil, and it didn't work. I did not solder the wires. I just bent the tips down and taped it to the back of the phone.

    It gets warm, but not very warm.
    AFTER re-reading the thread, it appears you need BOTH right & left to initiate charging, but this has NO problems?

    What charger are you using?
    05-23-2015 07:29 AM
  8. John Sevinsky's Avatar
    Apparently, I can't post a link to it, but search for DigiYes Charging Receiver on Amazon.
    GrayW0lf and jchapman01 like this.
    05-23-2015 09:10 AM
  9. Borteeo's Avatar
    This is brilliant. How did you know that you needed to cross the wires - which one would be positive/negative? Was the adapter for wide-up or narrow-side-up (using terminology I've seen on the Ebay ads :P)


    Here's my Qi charging solution. I didn't want to open the 1520, so I took a generic Qi charger (one that plugs into a micro USB jack), cut the USB plug off, stripped the tips of the wires, crossed them, and taped them onto the left & center pins on the back of the phone. (Nothing is attached to the right pin.) It seems to be working OK. I have the phone in a case, so you don't see any of this.
    06-07-2015 02:34 AM
  10. Sonartech's Avatar
    Will it work long-term? That depends on how fragile the installation is. I would assume double-stick holds the receiver on the back of the phone, so it's probably pretty secure, so my only concern would be the electrical connections. As pictured, this receiver is only connected to (-) and (+), but (SLEEVE_DET) isn't connected, so I'm not sure how John's device is even sensing the charge voltage. In my testing, (SLEEVE_DET) had to be grounded (connected to negative) in order for the PMIC to determine a PMA charging sleeve was attached (and therefore expect a charge voltage through these pins). So, I'm not sure what's going on there, but John says it works. The physical connection to the chrome buttons seems like it might get twitchy since it's only held on with tape, but then again, it's completely removable without any sign of it ever having been there.

    Anyway, it's still potentially a decent solution for people not interested in opening their devices, fraking with the PMA flex, soldering in a receiver, etc... Electrically, it's essentially identical, except for the missing connection to SLEEVE_DET which doesn't appear to be a problem for Jim's device (for some reason).

    The "shield" on the back of the receiver is a ferrite core/pad used to magnetically couple the receiver coil to the transmitting coil. Ferrite is extremely hard but also very brittle, and it cracks very easily on these thin Qi receiver coils. It's best to avoid cracking it if possible, but small cracks don't appreciably degrade performance. The coils (Tx and Rx) must be facing each other to be properly coupled. A Qi coil that's backwards (i.e. has the ferrite pad in between the two coils) won't couple properly.

    SonarTech
    Last edited by Sonartech; 06-10-2015 at 11:46 AM.
    GrayW0lf and TheBadGuy_88 like this.
    06-10-2015 11:31 AM
  11. rezoloot's Avatar
    I've bought a couple of 1520 wireless backs and a couple of 920 coils, I'm fairly certain i'll blunder the first, so it gives me two chances to get it right using one or both methods (nickel pen and solder for earth), I'll post pics anyway, a lot more pictures so you can see how easy or hard it is for a novice

    And thanks to all for their patience and advice

    Rez

    Ok.
    so you can see the three cases I have, I bought two wireless 1520 backs 12, two 920 backs wireless and the 1520 has the three pins for charging on the plate RM-940 USA AT&T variant (don't mind the screen or the charger DT-910, they both have protectors so look a bit ragged
    wp_20150613_11_34_54_pro.jpg
    all the parts
    wp_20150613_11_37_14_pro.jpg
    the 920 wireless charging rates at 6.98 volts on the dt-910
    wp_20150613_11_42_42_pro.jpg
    stripping the 1520 wireless back
    wp_20150613_11_49_53_pro.jpg
    added the 920 wireless charging unit to to the wireless 1520 back
    wp_20150613_11_54_59_pro.jpg
    added the three pin strip
    wp_20150613_15_09_48_pro.jpg
    was so eager to get it in, did not take a pic


    will add more pics later when the children have gone to bed, I woulw not open it tbh but two thing a, its charging as you can see but I think I've put the coil to low because it just keeps the charge at a steady 88% which it was when I modded it and b, want to show you how have soldered it, you may think its very messy but, the tools Im working with are a bit naf and the solder is the biggest there is, I'll put all pics up later.

    Thanks for looking guys and please comment, positive or negative, it all helps me become more proficient at the end of the day.

    Regards

    Rez
    Last edited by rezoloot; 06-13-2015 at 10:06 AM. Reason: Updated the mod
    sweatshopking likes this.
    06-11-2015 05:44 PM
  12. sadude69's Avatar
    I just wanted to add some additional info. I have a Lumia 1020 wireless charging cover that I took apart yesterday. Here is the piece I am planning on using but I am not sure it will work as it looks nothing like the 925/920 pieces. Can anyone confirm if this is an acceptable equivalent?

    The first picture is the Lumia 1020 charging over piece that connects to the 2 external pins of the 1020 device.
    wp_20150621_15_05_42_pro_li.jpg
    Second Image is my international 1520 cover that I plan to mod. I will use the QI coil here and will most likely just acquire the Lumia 925 charging cover at this point
    wp_20150621_15_05_49_pro_li.jpg
    06-22-2015 08:49 AM
  13. rezoloot's Avatar
    Hi sadude69

    The only problem I could possibly see is that, there are three plates to connect to, on the 1520 phone (not the wireless shell you have. which has two) and 920/5 has three but there only seems to be two on the 1020 wireless charging unit, Maybe the guys here could say if that is a major problem but to my recollection going through this thread, (page 5 onward) you will probably reach the same conclusion, the 920 I tried mine with was not charging enough either, maybe a faulty unit, my rubbish soldering (OR BOTH) so am trying with a 925 and the 1520's coil with a better way of connecting the plates, will put up pics when done, good luck with your mod and please post when done
    Last edited by rezoloot; 07-01-2015 at 10:09 PM. Reason: too much info on first attempt
    07-01-2015 10:06 PM
  14. Microsoftjunkie's Avatar
    Why don't ppl just buy a back cover with the coil already in it? They're only $30.
    07-01-2015 10:25 PM
  15. rezoloot's Avatar
    If you look through the thread you'll find that there is quite a bit more tech than just the coil required to make it a wireless charging phone, quite a bit indeed and tools plus the rock like steady hand

    If it makes you feel any better, I thought the same before reading what the intelligent ones had to say
    07-02-2015 08:34 AM
  16. Talderon's Avatar
    Why don't ppl just buy a back cover with the coil already in it? They're only $30.
    If you look through the thread you'll find that there is quite a bit more tech than just the coil required to make it a wireless charging phone, quite a bit indeed and tools plus the rock like steady hand

    If it makes you feel any better, I thought the same before reading what the intelligent ones had to say
    I think what he means is the buy the Wireless Charging Covers that are on the market for the AT&T 1520.

    On that point, the ones that are on the market are PMA, where this thread is about Qi. These are 2 different and non-compatibale standards for Wireless Charging.

    Many people (myself included) bought the 920 and other earlier phones that had Qi built in. Those with the Qi hardware that do not want to buy a case + more hardware are the ones that are interested in this mod. There is no external hardware needed and you can use your existing Qi chargers.

    Myself, I still have all of my Qi hardware, but I decided to buy the PMA case and charging plates for my 1520 without doing this hardware hack. Why? I managed to get the case and 2 PMA 2-Device charging pads for $40 on an Amazon deal.

    The case is minimal and works well for me.
    rezoloot and Microsoftjunkie like this.
    07-02-2015 12:48 PM
  17. Microsoftjunkie's Avatar
    I think what he means is the buy the Wireless Charging Covers that are on the market for the AT&T 1520.

    On that point, the ones that are on the market are PMA, where this thread is about Qi. These are 2 different and non-compatibale standards for Wireless Charging.

    Many people (myself included) bought the 920 and other earlier phones that had Qi built in. Those with the Qi hardware that do not want to buy a case + more hardware are the ones that are interested in this mod. There is no external hardware needed and you can use your existing Qi chargers.

    Myself, I still have all of my Qi hardware, but I decided to buy the PMA case and charging plates for my 1520 without doing this hardware hack. Why? I managed to get the case and 2 PMA 2-Device charging pads for $40 on an Amazon deal.

    The case is minimal and works well for me.
    Thx, tthat'sa good deal. I think iI'llgo that route and upgrade all my other gadgets.
    07-02-2015 07:55 PM
  18. Liam Wong's Avatar
    Has anyone experienced slow charging after using this mod? It took about 5 hours to charge from 46% to 100% yesterday night, so around 11% per hour. Back when my RM-938 1520 was still alive, it was around 25% per hour. When I measured the voltage of the coil, it read ~7 volts (shouldn't it be more like 12?). I'm using the Lumia 920 coil btw. Thoughts?

    edit: I read a few pages back and 7v is correct.
    Last edited by Liam Wong; 07-22-2015 at 02:16 PM.
    07-21-2015 10:46 AM
  19. AwaySys's Avatar
    Did you ever decide to make a video on the replacement of the rear cover for the 1520 ?
    09-12-2015 05:07 PM
  20. br3nd0's Avatar
    Question - and apologies if this has already been answered in the previous 11 pages.... I'm a massive fan of the 1520 and I have a Black RM-937 international HK version with wireless charging inside the back housing.

    I really want to get a green shell on this bad boy, but the green one thatOriginal Parts Mobile sell is the RM-940 version.

    Can I simply strip the green RM-940 one back to plastic shell and 'transplant' all the parts from the black RM-937 housing over to the green one?
    10-26-2015 02:28 AM
  21. Steve Russell3's Avatar
    I have thought of something similar myself . I knew it works work because I have taken a bench adjustable power source and put 3v to the exposed small metal contacts on the back of the case and got it to take a charge. I am sure ATT intended to sell a case to snap on the back , just another way to suck more money out of people . They did the same with the LG G3 and after much effort finally got a PMA back. After getting the back ATT knocked the charging back out with Lollipop. Without ever admitting any wrong they sneaked in an update that fixed the issue. The whole mess is ATT trying to push PMA charging which I am sure they have a vested interest in . Both systems work well a but QI charges at a greater distance and is cheaper . Not on is att pushing PMA but screwing up phones advertised with QI charging. This wireless charger you have in the photo certainly looks PMA , I have not seen a QI like this before. Thanks for your time and efforts in trying ti rite someone else's wrong (ATT) !
    11-16-2015 07:45 AM
  22. Steve Russell3's Avatar
    Wireless charging usually is slow . Mostly 750mah and some go to 1000mah. I have noticed the 1520 is a slow charger even with the OEM charger .
    11-16-2015 07:51 AM
  23. Steve Russell3's Avatar
    Thx, tthat'sa good deal. I think iI'llgo that route and upgrade all my other gadgets.

    Yes indeed they are different. I thought a few years back the phone companies came to an agreement that QI would be the standard. Strange how ATT insists on trying to push PMA . Got to have something to do with money . Both are good , qi works at a greater distance !
    11-16-2015 07:55 AM
  24. Steve Russell3's Avatar
    Hi sadude69

    The only problem I could possibly see is that, there are three plates to connect to, on the 1520 phone (not the wireless shell you have. which has two) and 920/5 has three but there only seems to be two on the 1020 wireless charging unit, Maybe the guys here could say if that is a major problem but to my recollection going through this thread, (page 5 onward) you will probably reach the same conclusion, the 920 I tried mine with was not charging enough either, maybe a faulty unit, my rubbish soldering (OR BOTH) so am trying with a 925 and the 1520's coil with a better way of connecting the plates, will put up pics when done, good luck with your mod and please post when done
    That third connection has me bothered too rezoloot. I saw where someone had shorted it to the -negative.
    11-16-2015 08:01 AM
  25. theefman's Avatar
    Anyone still offering a service to mod an ATT version with Qi? Seems all the Unicorns have gone back to their magical kingdom.....
    Sent From my SP3i3
    04-28-2016 06:00 AM
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