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.
Related
Is there an antenna build in for nfc???in this cover.
Want to use a 4300mah battery without nfc antenna and use the antenna in the cover.
Is there anybody ?who knows what the other pins on the wireless charging cover do??
Just got the battery without nfc and tried and can confirm that the nfc still works.
So if you purchase a wireless charging cover and a battery no functions are lost.meaning there is a nfc antenna in the official charging cover and cases.
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")
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.
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
Does anyone have a circuit diagram of an Umi Super main board? I am especially interested to know just what purpose the three flexible connections in the uper right corner on the board serve. They obviously make contact with opposite side of the phone case when it's assembled. There are also three at the top left corner of the board as well. After droping the phone, the two connectors at the very top on both sides broke off. The result was that the battery was quickly drained and no longer could be charged.
I managed mount them back on so that they also had functioning contacts by carefully super glueing them in place. After reasembling the phone it worked again but only for two days, then again I couldn't charge the phone. It turned out, that the connector on the right top corner had broken off again.
So just what is it for, anyway, because as far as I can tell, really only the second connector has a connection to metal on the cover when assembled?
So now I very, very carefully sodered it together and I knew I could destroy the rest of the electronics, but had nothing to loose... Then I tested the connection with a ohm meter and it was as it should be. Again I reassembled the phone, but still can't charge its battery. Maybe I really did kill something else in the process.
Still I am interested in a circuit diagram to understand what might be the problem. Can anyone help out?