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This is the device page for the Samsung Galaxy J7. The OS that comes stock to the device is Android OS v5.1.

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dropped my phone in water all my buttons on the bottom dont work

dont work but everything else works

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Hi,

As you know water and electronics and electricity are not a good mix.

The impurities in the water causes corrosion and provides circuit paths for the electricity which were not in the phone's operating design and could damage the components.

First do not turn on your phone and then you need to with the phone turned off, remove the battery as soon as possible from the phone to minimize further damage.''

Then you need to dis-assemble the rest of the phone and clean all the affected parts using Isopropyl Alcohol 90%+ (available at most pharmacies), to remove all traces of corrosion and water. Do not use "rubbing alcohol" as in some cases this is <70% IPA, can contain scents and is not as effective. If you do have to use it, check the label to verify the amount of IPA.

Here is a link that describes the process.

Electronics Water Damage

As always with electronics, especially surface mounted PCBs be gentle when handling and especially when brushing away the corrosion. You do not want to remove any components from the board.

Hopefully after you have done all this the phone might possibly work correctly again.

Here is a link to the ifixit guide(s) for repairing your phone, which may be of some help.

Samsung Galaxy J7 Repair

If this process seems too daunting, take your phone to a reputable, professional mobile phone repair service, experienced in water damage repair and ask for a quote for a repair. If you decide to do this, do it sooner than later.

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Was there any cracks in the screen or just the water damage? What device is it? How are the speakers and battery after the dip? Usualy after going in water vacume sealing it in a bag of rice helps or the silicone packing beads. If it is buttons that may be replaceable if it doesn’t have any other issues. Water damage can have some other underlying issues that may go unoticed unless opened.

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