Xperia Tablet Z Qi Charging Possibility? - Xperia Tablet Z Q&A, Help & Troubleshooting

Just curious if anyone else will try or has tried this?
I note the Xperia Tablet Z has NFC pins for wireless charging. From the Nexus 7 I know you can solder to these points internally and use a Qi charging pad.
Given the size of the XTZ I imagine you cannot fit a pad inside to do this (nor would you want to open this), but, in conjunction with a case, has anyone tried soldering to the external nfc?
I have a tablet on order and will be trying this and was curious if anyone else has attempted it. USB charging is slow, and perhaps this will allow us to charge faster than usb?

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Sean09 said:
Just curious if anyone else will try or has tried this?
I note the Xperia Tablet Z has NFC pins for wireless charging. From the Nexus 7 I know you can solder to these points internally and use a Qi charging pad.
Given the size of the XTZ I imagine you cannot fit a pad inside to do this (nor would you want to open this), but, in conjunction with a case, has anyone tried soldering to the external nfc?
I have a tablet on order and will be trying this and was curious if anyone else has attempted it. USB charging is slow, and perhaps this will allow us to charge faster than usb?
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I think that is possible because:
1) It have two external contact pin on left-side that for charging for docking.
2) Refers to this video http://www.youtube.com/watch?v=B3GJSlpFFVc, you can find the positive pin and negative pin or ask someone has a docking.
3) buy a coil from http://www.amazon.com/Aftermarket-Product-Wireless-Charger-Receiver/dp/B00BHOR3SA
4) Find some cases that suitable hold the coil.
for safety, find out the voltage from docking contact pin.

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I am going to give it a try once mine arrives, as the dock charges faster than the USB, so it should take the Qi no problem. Just a matter of cleanly integrating it into the case I choose, since based on the disassembly I have seen there is no space internally. Fitted between the case and tablet shouldn't be a huge issue.

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Sean09 said:
I am going to give it a try once mine arrives, as the dock charges faster than the USB, so it should take the Qi no problem. Just a matter of cleanly integrating it into the case I choose, since based on the disassembly I have seen there is no space internally. Fitted between the case and tablet shouldn't be a huge issue.
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Did you have a go at this? Curious to know if you were successful or not.

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Unfortunately I was unable to do any sort of testing on this matter as once I returned home where my supplies were, the tablet stopped working. Once I get a replacement I will investigate further.

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Bummer, that's unfortuneate. Would be great if you could keep us informed as to how you go with this. Time permitting, I may have a shot as well.

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Anyone make progress? I'm trying to figure it a decent way to attach the wires without soldering to the tablet.

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You absolutely have to find out what voltage and current the docking station pins are rated for or else you're very likely to fry something. It's very possible that the docking connector uses a higher voltage than 5 V or a higher current than 1.5 A, especially considering the dock charges noticeably faster than the USB charger.
Since the port on the tablet has a lot bigger contact surface area than those of a micro USB connector, my guess would be that they use a higher current, but it might as well be a higher voltage and the large surface area is for providing a reliable connection. You will have to find this out yourself with a multimeter unless it's explicitly stated on the docking station.

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Djhg2000 said:
You absolutely have to find out what voltage and current the docking station pins are rated for or else you're very likely to fry something. It's very possible that the docking connector uses a higher voltage than 5 V or a higher current than 1.5 A, especially considering the dock charges noticeably faster than the USB charger.
Since the port on the tablet has a lot bigger contact surface area than those of a micro USB connector, my guess would be that they use a higher current, but it might as well be a higher voltage and the large surface area is for providing a reliable connection. You will have to find this out yourself with a multimeter unless it's explicitly stated on the docking station.
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Given that the dock charges well above what Qi does, how can you damage it by not applying enough power? Worst case it won't charge well, but you can't really overload it, no? How can a 500-1000ma Qi pad getting connected cause it to get damaged if it wants more power?
I note a guy built his own pogo pin charger here as well, which may be another option for me as I cannot think of a decent way to affix the wire without solder.
http://chargeconverter.com/blog/?p=194#comment-1930
I know you can damage it by reversing polarity, however.

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Sean09 said:
Given that the dock charges well above what Qi does, how can you damage it by not applying enough power? Worst case it won't charge well, but you can't really overload it, no? How can a 500-1000ma Qi pad getting connected cause it to get damaged if it wants more power?
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I wasn't talking specifically about the tablet when I said "fry something". It's true that applying a lower voltage than what the tablet expects shouldn't cause any damage, but there's no way of knowing without analyzing the charging circuits. It may confuse the charging circuit and provide power backwards.
On the topic of current, a Qi pad rated for 1000 mA would definitely not be enough. I'm not sure what a Qi pad contains, but it would at least need a coil and a rectifier. Assuming there's no current limiter involved, these components would get hotter than expected and possibly overheat, causing damage to some extent.
By all means, build your own hardware but don't skip out on your research.

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Djhg2000 said:
You absolutely have to find out what voltage and current the docking station pins are rated for or else you're very likely to fry something. It's very possible that the docking connector uses a higher voltage than 5 V or a higher current than 1.5 A, especially considering the dock charges noticeably faster than the USB charger.
Since the port on the tablet has a lot bigger contact surface area than those of a micro USB connector, my guess would be that they use a higher current, but it might as well be a higher voltage and the large surface area is for providing a reliable connection. You will have to find this out yourself with a multimeter unless it's explicitly stated on the docking station.
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Djhg2000 said:
I wasn't talking specifically about the tablet when I said "fry something". It's true that applying a lower voltage than what the tablet expects shouldn't cause any damage, but there's no way of knowing without analyzing the charging circuits. It may confuse the charging circuit and provide power backwards.
On the topic of current, a Qi pad rated for 1000 mA would definitely not be enough. I'm not sure what a Qi pad contains, but it would at least need a coil and a rectifier. Assuming there's no current limiter involved, these components would get hotter than expected and possibly overheat, causing damage to some extent.
By all means, build your own hardware but don't skip out on your research.
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Thanks for the pointers. Seems my qi receiver pad is only rated for 650ma and gets extremely hot as the tablet is connected, presumably because it is trying to draw the 1750~ the dock provides. I would assume if I left it for long periods it would melt the receiver. I will order one rated for 1000ma to see if it gets as hot, then worry about permanently affixing it.