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

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Bump on SHIELD CAN- PMIC on motherboard

One day without warning, my son's Samsung galaxy s7 phone would not turn on or show signs of charging. He took very good care of this phone and didn't put even a scratch on it or drop it. We replaced both the battery and display. Before gluing the phone back together we tested it, and it still shows no sign of life. We bought the phone new on eBay, but when we opened it two years later when it stopped working, it was obvious we had been scammed. There was a big F written with sharpie pen where the serial number should have been on the sticker, and other stickers, stamps, and internal scratches of previous repair. Besides this, there is a big bump on the PMIC shield on the motherboard. Does anyone know what this indicates, and if it is repairable? We really want to recover the data from this motherboard. But the area that appears damaged is either where the storage is located or close to it (from what I gather from research). Are there any good tutorials on using a multimeter to test the different parts of the motherboard? I don't know where to place the points of the multimeter to test the voltage of the power button, and if the battery needs to be inserted into the phone to be able to test the voltage of that part. Specifically, it is part R7027 that the voltage level needs to be tested at. I just don't know how to do this. It is hidden by that same shield with the bump on it. Can the power key FPCB be replaced easily? Images of the motherboard are posted below. The bump stands out pretty well.

(I used the schematic for S7 SM G930F at simplecodehub.com posted by blue-thunder to reference the parts list, location, and flow of repair)

1) What does the bump on the PMIC shield indicate?

2) tutorials on testing different parts of the motherboard?

3) Where to place the points of the multimeter to test the voltage of the power button at R7027.

4) Does the battery need to be in the phone to test voltage of parts on the motherboard?

5) Can the power key FPCB be replaced?

6) Can the PMIC be fixed without losing the phone data?

7) What would have caused these issues? Something by the user, manufacturer, or refurbishment?

This may not be worth it to repair financially, and I am okay with that. I am in it for the learning experience, and the slight chance at saving my son's minecraft worlds and pictures that are on this phone. Thank you for your time. I am a complete novice, so I appreciate any help and respectful guidance.

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Beantwoord deze vraag Dit probleem heb ik ook

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Ja Nee
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Is the charging port ok? All pins inside ok and solder joints solid? Don't suppose you have access to a power meter to see if the board is pulling any power from the charger.

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Thank you for your reply! There are no visible signs of damage to the port or looseness. This phone has wireless charging capabilities, so we had tried charging it wirelessly before taking it apart. The charger lights up when it starts charging a phone. We tested our other wireless charging phones on the same charger. When we put the dead phone on the wireless charger, the charger DID recognize it and acted the same as while charging our other phones. The phone itself did not respond in any way. Not even the blinking LEDs work. No dead battery screen, flash or vibration. Inside the phone, we don't see any damaged pins or cables internally. I haven't taken the shield off yet because I have never soldered before and wondered if there was a way to test it without taking it off. I have a Fluke electronics multimeter combo kit 179/EDA2 Kit. I am not sure if it has functionality to read if it is pulling power from the charger. Would the battery need to be connected in the phone to test this?

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So. I have even better news for you. Obviously if you find damage under the shield, solder skills are probably going to be necessary. But. These shields are actually not soldered on. The one on the back with the black sticker over it is. But these are just snapped on. I can usually pop these off with just a fingernail, just be careful. They typically bite into my nails a bit, you can probably also use a spudger for this purpose if you're more precious with your fingernails than I am, I just don't always have as much luck getting into the corner any other way.

Only answered rather than commenting to attach this picture. If you look closely, you can see how the shields in this area clip onto a frame which is soldered onto the board. They are pretty bendy, but I doubt you care too much about getting the shields back on. Where the arrow is, you can see on the shield just below the one you've got the damage to, there's a small gap between the clipped on shield and the soldered on bit.

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@catbyte_io it might help if we know what exactly is damaged under the EMI shield. If you have a hot air station or a soldering iron, remove that shield. If not, you can use some strong scissors (like trauma shears or similar and cut it off) Careful of course but it is possible,. "Can the power key FPCB be replaced easily?" yes, it can be replaced just nothing really easy, but it depends on your comfort level. Let us know if your model is a SM-G930 or if there are any Letters after.

To check any voltage on your phone, you will need to set your meter at DC voltages. Then place the Black probe on Ground and the Red probe to one contact on the Resistor.

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Under that EMI shield you will find your R7027

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You can download those pictures and zoom in with your own graphics viewer. They are scanned at a pretty high rate.

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Thank you for your help! The motherboard says SM-G930FD, and right below that SM-G930F-V8. That is printed near the camera, and you can see it in one of the pictures, although not very clearly. The cable on the daughter board says SM-G930F_REVO.BD

I have never soldered before, but I am getting a Hakko and will practice on an old computer before touching this. There are holes in the shields, so I thought maybe there would be access through those. It sounds like there is no choice but to take it off though. I am not 100 percent sure if there is damage under the shield, or if they used a damaged shield to begin with. Whichever the case is, it will be a good experience to take a look at what is going on underneath. Thank you!

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@catbyte_io yeah it has to come off. The odd thing is that it is pushed out. can't figure out why that would be unless the EMI shield was pushed down into the components. Time to disassemble. This Video should work for that.

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Thank you for the video. Most of the disassembly videos do not show how to take off the home button or the board with the charging port. This one did, and that was helpful.

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Erin zal eeuwig dankbaar zijn.
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