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  1. petrev's Avatar
    Hi,

    Based on previous work by many others including "Otterbox wireless charging mod" by Cubanaso
    Cheap Charging Mod + Case

    Uses:-
    GENUINE Nokia Lumia 925 Wireless Charging Cover CC-3065 (ebay item.321826141838) 3.99
    plus
    S-Line Wave Silicone Gel Case Cover FOR Nokia 1020 (eBay item.171183008287) 1.79
    or probably any other Gel case.

    Total Cost ~ 5.80 ish

    Needs :-
    Soldering Iron and solder
    Stanley Knife (or similar)
    Wire cutters
    Short bit of thin wire - 10cm max
    Vinyl Tape

    Useful:-
    Heat Gun / Hair Dryer
    Double Sided Tape if attempting to mount in case (or thin foam like "3 M" cheap stuff on eBay)
    Lots of patience !

    Method...

    You have to get the coil and contacts out of the case back, then remove the central contact and move the 2 remaining to 4mm apart.
    I cut the PCB in half and trimmed and repositioned to get 4mm gap.
    You could unsolder and move 1 contact closer and re-solder in 4mm position.
    You have to make sure there is no electrical path between the contacts on the film PCB - If you don't cut the PCB to move the contacts closer like I did (i.e. you are moving and re-soldering one contact) then you need to remove any path by unsoldering the little SMD resistors that are linking any affected tracks. Check for infinity before connecting contacts to coil in any case.

    You also have to rotate the film PCB that the contacts are attached to by 180. Destroy any electrical circuit between the contacts and reattach the coil to them using short, thin wires. Reattach the contact cover after removing a little bit of the middle area so that the contacts are kept 4mm apart.

    I kept the contacts and cover in place by reapplying the inner surface cover (thin plastic that cuts to size with scissors.

    The entire assembly has to be cut to a minimum size (about 1 - 2mm larger than the coil).

    I then, after much trial and lots of errors, decided to reattach the Back Plate of the case to add stiffness to the assembly and keep everything in place nicely. This is a piece of the hard back plate that just covered the coil and has the Nokia Logo on it (nice) - the thinnest part of the case but thicker than the phone side thin cover.

    This piece may not be necessary and does add some thickness and stiffness but also stiffness.
    There may well be a way to do this all without first removing the coil from the back plate by just cutting the whole part out of the back but I haven't tried that method (only one donor CC-3065 Case).

    I first tried using the film PCB attached to the coil as is. Just moving the contacts closer together - but - that was when I discovered that space was to tight and the 1020 contacts were mounted the opposite way up to save space. I copied this and rotated them 180 to get them as close as possible to the coil.

    After many trials I managed to get the assembly mounted in the case with double sided foam tape - but - good contact is more hit and miss than I liked, so I mounted the assembly to the phone instead with vinyl tape - checked operation and then fitted the case - Works a treat and if you don't want to keep swapping cases this is not a problem. If you do then you will have to mount in a case or re-attach each time you swap to a case without charging (e.g. Camera Grip Case)

    Any Questions ? Just ask ??
    (I can't post photos/links into text as too few posts - so editing photos now . . .)

    Photos . . .
    Attached Thumbnails 1020-chargermod1-01.jpg   1020-chargermod1-02.jpg   1020-chargermod1-03.jpg   1020-chargermod1-04.jpg   1020-chargermod1-05.jpg  

    1020-chargermod1-06.jpg   1020-chargermod1-07c.jpg   1020-chargermod1-08.jpg   1020-chargermod1-09c.jpg  
    Last edited by petrev; 11-17-2015 at 07:38 AM.
    11-16-2015 03:50 PM
  2. Steve Adams's Avatar
    Thank You! Now I can get my wireless charging setup. I have been asking this for ages. Its great to know that you just remove the center contact and adjust the spacing. AWESOME! Off to ebay to buy a few cases!
    11-17-2015 04:21 AM
  3. Steve Adams's Avatar
    BTW, do you think the phone will charge through a leather flip case? also, do you think this can fit inside the speck candy shell?
    11-17-2015 04:21 AM
  4. petrev's Avatar
    Thank You! Now I can get my wireless charging setup. I have been asking this for ages. Its great to know that you just remove the center contact and adjust the spacing. AWESOME! Off to ebay to buy a few cases!
    Hi,
    You have to make sure there is no electrical path between the contacts on the film PCB - If you don't cut the PCB to move the contacts closer like I did (i.e. you are moving and re-soldering one contact) then you need to remove any path by unsoldering the little SMD resistors that are linking any affected tracks. Check for infinity before connecting to coil - Must put this in the method - Ta.

    Get them while they are cheap !

    BTW, do you think the phone will charge through a leather flip case? also, do you think this can fit inside the speck candy shell?
    Probably charge fine through a leather case.
    Fit with a hard case is probably problematic - Probably have to leave out the Back case piece as this is relatively quite thick.
    Use of vinyl tape for the rear instead would probably help, and with trial and error may work.
    I prefer the Gel type cases as they can protect more in some cases (cover Camera bulge) - may be less safe in a drop ??

    Pete
    Last edited by petrev; 11-17-2015 at 07:43 AM.
    11-17-2015 07:31 AM
  5. Steve Adams's Avatar
    Yeah, I was thinking I was going to leave the plastic of the charge case off and carefully peel off the charge coil and install it on my spek. That way I can use the cases I have now.
    11-17-2015 09:13 AM
  6. tweedie's Avatar
    cheers for those photos. May chat with you later. just waiting for my 925 charging bits to arrive from post. I think I've ordered mine from usa... (let me check)

    .... bugger, it is from usa, but its a 920 charging coil. hope its suitable (gulp) Wireless Charging Coil for Nokia Lumia 920 - Parts4repair.Com
    11-17-2015 09:27 AM
  7. petrev's Avatar
    Hi,

    The 920 coil should work fine - Just got to remove from PCB and then add some wires or somesuch to stick into the contact holes on the back of the 1020 - Keep in place with vinyl tape at a guess. May be neater and slimmer in the long run but not quite as easy, maybe, to get the contact without the little pins ?

    Have fun experimenting and let us know how it goes . . .

    Pete
    11-17-2015 11:15 AM
  8. TechieTim's Avatar
    Excellent idea and post!
    I had the same idea and searched to see if anyone had done it already, and found you had! Good - saves me some R&D / trial & error! :-)

    I wondered why the circuitry was discarded, but having now made one myself, I discovered that the 920 cover includes rectifier circuitry to provide 7v dc to the phone, whereas the 1020 takes the high frequency ac straight from the coil. (presumably the 1020 has the rectifier circuit in the phone).

    Just out of interest, I took a look at the signal coming out of the coil. A screen shot is here for your info:

    2016-12-22.jpg
    Last edited by TechieTim; 12-22-2016 at 09:07 AM. Reason: update
    11-21-2016 04:51 AM

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