I just noticed that there is a pair of contacts on the inside of battery cover and matching spring loaded contacts in the housing, next to the lower left and right corners of the battery. Anybody knows what are they for?
If they are really electrical, is it possible to detect from software if the bettery cover is removed? Not that this could be used for anything useful, but just curious if that's possible.
vponomarev said:
I just noticed that there is a pair of contacts on the inside of battery cover and matching spring loaded contacts in the housing, next to the lower left and right corners of the battery. Anybody knows what are they for?
If they are really electrical, is it possible to detect from software if the bettery cover is removed? Not that this could be used for anything useful, but just curious if that's possible.
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I'm just guessing but I know that the first version of the car kit involved replacing the back cover....so...I'm guessing it relates to having the car kit plugged in and just putting the phone in the kit without needing to attach a cable in the phone each time.
Did I mention that I'm just guessing.
n11 - Good guess.
Thanks for the tip. So, from what I understand, these contacts are for power supply, correct?
vponomarev said:
Thanks for the tip. So, from what I understand, these contacts are for power supply, correct?
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Well...since Mega Maniac has given such strong support to my guessing ability I'll answer this way: Yep, I guess the contacts are for the power supply.
The contacts are probably for proper grounding since the battery cover is metal. It would be bad to have a static charge differential build up on the cover take out the circuit board. Or it may be that the cove is the antenna. But I doubt that. Just my opinion.
I was thinking within the same line, but more like bettery cover being a shield to prevent any external radio interference. But power connector theory sounds more reasonable. I'm NOT going to verify this theory by applying 5V to these contacts.
vponomarev said:
I was thinking within the same line, but more like bettery cover being a shield to prevent any external radio interference. But power connector theory sounds more reasonable. I'm NOT going to verify this theory by applying 5V to these contacts.
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I'm now guessing that you are a very smart person...grin.
Just for the record I dont have the HTC navigation car mount, but if you are talking about the teo connections either side of the back cover then I cant see what else it would be. Essentially my opinion is as much of a guess as n11, but I would bet my HD2 on it, because there is just about nothing else it could be.
I'd like to know for certain what these are for as well.
Grounding
These connectors are probably grounding, if you see on the cover the paint is striped away where the connectors meets the cover.
If this was in anyway connected to the battery for charging it would short out the battery since the cover is made of metal.
Just Checked With my multimeter and there is a direct connection between the two points, and also between the screws and the two points, so grounding it is.
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.
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.
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.
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?