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Released by Samsung in March 2016. Model SM-G930.

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My phone is probably dead/doesn't want to charge.

Hello there,

I have Samsung Galaxy S7 from 2016 year. Before 3 weeks I was charging him with original charger and cable (Fast Charging) and it stopped and doesn’t wanted anymore to be charging. I cleaned the port and wiping it out with Isopropyl alcohol but still doesn’t want to charge. I tryed to charge him up with my original samsung wireless charger. He started to charge but very very slow needed about 12 hours or more to charge to 100%. And after 2 days the wireless charging too doesn’t work anymore.

  • I want to ment that before 1 month and half I replaced the battery with a new original one. I am a tech guy and repairing a phones. Everything went good.

I checked what can be the problem inside but didn’t found something. I checked some youtube videos for this problem and saw some videos about 2 chips which needed to be resetted. I did this, but still the same issue. The phone doesn’t want to charge no matter how.

My old battery was having a 50% life inside it and I put it back and the phone started up but doesn’t want to charge. I backed up my files wirelessly before the battery drained.

I didn’t find any solution for now. I am searching for external battery docking station where I can put my battery to charge it up and put it back to phone to can back up everything. Is there a such devices and if yes can someone tell me for what to search? Because I searched in eBay but didn’t found anything there.

Before years when I was having a Galaxy S4 there was a such devices, but for S7 I didnt find something.

Please help me out. Thanks in advance.

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@boomlex since you already replaced the battery with a new one, do an organized troubleshooting like suggested by Samsung for your model phone. Everything else is just costly and unnecessary replacement of parts.

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I am not so good at diagnostic motherboards problems, too am still beginner at microsoldering process.

I checked L7022 Capacitor it seems to be okay at 5V from my measure multimeter.

The C7149 capacitor strange but when i was trying to measure him it peeled off pretty easily. Now I does not have that capacitor. I ordered from eBay many ones to have just in case. Anyway I didn't find the problem. Maybe it's in this c7149 capacitor which fallen off. I am uploading a picture from the microscope. I don't know what to do. Any suggestions? This is from the back

Picture: https://i.imgur.com/e5PY9og.jpg

I tryed like this guy https://www.youtube.com/watch?v=a33I_404... to heat those chips on front of the motherboard to just re-flow the chips. But nothing happend. When I put usb cable on I am hearing a strange noise like little cracking thing. The motherboard is getting heat but those chips like on the youtube video which i linked are still cold and doesn't get heated, are they the real problem or?

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@boomlex C7149 falling off is definitely a problem and can be the issue. You will have to replace it. It's Samsung part number 2203-006841 and is a 1000NF (or 1UF)10% 16V capacitor in a 1005 package

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When I receive the capacitor will replace it to see will it have any difference. Will update when have info. Thank you.

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@oldturkey03 I want to ask you something. If that doesn't work. Is it possible to buy a second hand motherboard and to replace the chip with my data from the broken one to the new one motherboard and if yes is it hard? Is it only one chip and who exactly is can you show me a picture?

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@boomlex sorry but no it does not. Chip-off does not work either because of all kinds of decryption of those chips. The only way to do it is by getting your phone to start up.

The S7 uses UFS 2.0 in a FBGA153 layout and it is not likely you get any readable info by performing a chip-off and reading the chip like they did with the eMMC chip. Samsung uses that memory on the Galaxy S6, S7 and above. Remember that full disk encryption is required on Android 6.0 it is unlikely that this will work. I would contact them and see what the charge it for the recovery. Let us know since we would really like to know what the cost of that type of data recovery is and if they even have a setup for the S7.

https://www.samsung.com/semiconductor/es...

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It is possible to externally charge a lithium phone battery with a DC Bench Power Supply by connecting the positive and negative cables (I use multimeter probes) at 4.3V on the negative and positive pins of the battery connector on the battery itself.

Be careful not to overcharge I stop charging them when they pull less than 1.0A.

To determine polarity it should still at least have some power left to measure with multimeter.

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As far as the battery with an external charger, it depends on the battery connection. If you have the old school flat contacts on the battery, a universal charger will work. I bought one off of eBay that works better than the one I found at batteries plus. Model YBY-001-018.

I had the same problem with a galaxy j7 and ended up replacing the charger port / headphone / vibrator cable assembly. If Samsung had put the charge port on a board, I may have been able to replace just the charge port. Nope, all one piece.

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That is the problem. The battery is not like the old ones with flat contacts. It's a flex cable connecting to motherboard. I am badly seraching for charger with connector like that. I don't have a idea how to charge the battery by myself :/ what to do or make. About the charging port. I already ordered a new charging port to test. I am waiting for it. Because I measure the charging port and seems to be okay. But will give it a try with a new one.

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Mr. Lex será eternamente grato(a).
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