I just notice 2 pins on my back panel (around the camera), it look like a NFC reader, someone know what it is for ??
I can't post a picture...
They're for the wireless charging coil (region specific).
My bad, I was wrong. After getting my V20 and reading the user guide I can now see the device surrounding the cameras is the NFC antenna.
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Just wanted to check. There are contacts on the rear cover, that go to contacts in the phone. Can anyone confirm what these are for? I want to say that the antenna is in that cover, and these are to connect the antenna to the phone. I'm about 95% sure i'm right on this, since i lose a few bars of signal when the rear cover comes off, just wanted to make sure i'm right.
I saw this thread and asked the rep while I was in the store today for warranty stuff, he said he has no idea and that it's either for antenna or inductive charging on a supported charging mat, like the palm pre has.
He showed me what the wireless charging thing looked like on his palm and it looked similar. Apparently you just set the phone down on a mat and it charges.
Don't know if that helped any, but it would be cool if it was for charging. I'll keep my eyes open for any accessories that would confirm this.
The back cover is indeed the antennae. And no, it (unfortunately) has nothing to do with a wireless charging method.
I need an expert advice in choosing Samsung original charging back or this Qi receiver. I have gotten used to with NFC to toggle things and I need NFC to work. Right now I have NFC cards (Mifare smartcards) pasted at the back of my desk and I use it over the desk that is 2 cm thick. I don't even have to touch phone to the desk for NFC to work. I hover 5mm above and Tasker takes over (with one profile I copy files off network drive). With so much of automation, I cannot go back to NFC working sporadically or working when I have to physically touch the card.
I do not use protective cases as I want my phone looking slim and sexy. And I heard original wireless back cover is too thick. Please tell me how thick it is. And if you are using Qi receiver, please tell me if you can read tags through 2 cm thick wooden table.
And I found NCF compatible Qi receiver in Amazon (click here). I have a question to people who own original samsung wireless back cover - is there buffer space between back of the cover and battery for thermal insulation? It would justify additional thickness.
I wish someone checked temperature difference at the surface of the battery when using Qi coil vs original back cover.
Having used both, I can assure you that the OEM cover is best for NFC, and I don't even notice the extra thickness. I even prefer the look, as the camera no longer sticks out. It's the only solution that works adequately with my NFC activated BT adapters, and is much more forgiving about placement on the chargers.
---------- Post added at 09:34 AM ---------- Previous post was at 09:33 AM ----------
And... It's the only solution I've found with working tap to pay.
rcobourn said:
Having used both, I can assure you that the OEM cover is best for NFC, and I don't even notice the extra thickness. I even prefer the look, as the camera no longer sticks out. It's the only solution that works adequately with my NFC activated BT adapters, and is much more forgiving about placement on the chargers.
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Thanks I ordered original wireless charging back.
Buy the original wireless charging back, at least that won't void your warranty if something goes wrong.
Anyone using the qi enabled s-view flip cover? I'm wondering if it's possible to charge the phone with qi when you have the flip cover open and put it on the back of the phone?
Would be nice if it worked as I would be able to use wireless charging in my car while running waze.
Galaxy S4 mini GT-i9195 comes with nfc and there are multiple apps to read e-passports (like nfc passport reader). The nfc antenna is part of the battery.
Trying to read two passports only one could be read successfully. Connection to the second passport got interrupted. Trying to change the position of the mobile did not help. Removing the cover of the mobile did not help either.
The nfc antenna is glued to the back of the battery. In case one has two batteries it is possible to modify one battery. Li-Ion batteries may burn, so only continue if you know what you are doing.
The outer protection foil has to be removed. Then the nfc antenna can be carefully peeled off from the battery. Just keep the two connections to the battery connected. Finally the nfc antenna can be glued with tape to some plastic card as shown on the attached photography. - The bottom of the battery has to be insulated with tape. Plastic card and battery have to be connected with tape to protect the two thin antenna connectors.
Result: second passport could be read. Probably because the antenna coil is no longer disturbed by the metal of the battery underneath.
Credits go to user mistayoung from s3forums.com (Extended Battery Case Mod) who documented how he moved the nfc antenna of a galaxy s3 on top of a maxi size replacement battery.
Hello
1) I have phone that was water damaged on couple parts (The water detection stickers are intact on cell phone and inside under main board, except on battery have half red)
I was cleaning board and one tiny resistor was burned/unsoldered well it come off and I was not able to measure it. It is R710 (look for SIM600 top) you can see on schematic. SM-N900A-TSHOO-7 (you can fine in google or other search engine)
My Phone is SM-N900T and it look exactly as SM-N900A (I guess the hardware is same but software might be different)
2) Also the screen does not come on. Any body know is voltage across C622 should be exactly 3.0 volts? I have there same voltage as battery if Battery 4V I get there 4V and if I ohm-out it look like connected directly to the battery terminals??? or chip shorted (U606 "MAX77804")
The idea was to do wireless charging for the clock. For the base took the Chinese charge from the Samsung watch, bought in Ali. The accessories for the receiving part were purchased at the nearest radio equipment store, the circuit there was the deformity of a simple coil, a diode, a zener diode and a capacitor, in total.
On the test launch "on the forehead" the circuit did not work, because charging the Samsung clock received feedback, which obviously I could not provide (I do not have enough knowledge for this). Good. We remove the "guts" from the docking station, and instead of the usual scheme we put the card from the universal wireless charging (also bought from China), only solder the transmitter coil from the station. The feedback from the docking station was realized simply at the on / off level, because of the reed switch (in the hours set by the magnet) that the charging will not work at idle, when there were no clocks, turned on the clock, switched off, turned off.
The receiver decided to connect not directly to the BMS battery, although I really wanted it, everything is available, take it and solder it. But with a high degree of probability, the charge indicator will not be excluded, which is not very good. Therefore, the eyes are afraid, and the hands are made, it is useful to disassemble the clock that will fall on the contacts of the power connector. In fact, everything turned out not so scary, you just need to remove the battery and carefully remove the black plastic frame that clings to both sides of the dog on the body. Very gently bend it to the side, trying not to tear off the loop of the pulse counter and the wire of the vibro and the microphone. Completely remove this is not necessary, it is enough just to raise, and here they have power contacts. We solder the wires and collect everything back.
Link to the video and photos can not post, the forum does not allow, because I do not have 10 messages. Sorry. I'll try that photo show 4pda.ru/forum/index.php?showtopic=775044&st=1420#entry72962124