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Infinix Mobile is a Chinese entry level smartphone company founded in 2013.

I dropped my phone (Infinix Smart 9) in dirty water

(Infinix Smart 9)

I dropped my phone on dirty water, I removed the case and immediately turned the power off, after 5 hours letting it dry I turned back on and charged it, it was charging really slow like 2% every 20 minutes and the battery drains every 4 to 5 minutes.

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@jadeedjohn46575 For now, you must stop continuing to try to charge, sync or otherwise use your phone. This potentially can make a bad situation worse. This may further damage your phone.

The next thing to do is to clean it. Since iFixit does not yet have a specific guide for this, use something like this videoRemove the main board and the charging board. You will have to remove all the EMI shields off those boards. If you do not remove the shields, you are not cleaning the board.

Take a close look at all components and connectors to assess the damage. Look for major corrosion, evaluate the pins in the connectors etc,. Take a look at all connectors as well as cable ends. Once you got any gross contamination cleaned, use 90%+ isopropyl alcohol and clean all of your parts (except the display) some more. For a proper cleaning, use this guide. It was written for an Apple iPhone 3G but all the steps are still pertinent to your phone as well. I can not stress the importance of a good cleaning enough, so do it over and over while replacing the alcohol after each cleaning. Best thing to do would be to clean it with an ultrasonic cleaner, but if you do not have access to one, this will at least help. While you clean your boards, check for any obvious damage, like burned or missing components etc. The importance here is the cleaning.

I personally do no longer clean the charging boards, but I replace those. They are fairly inexpensive and readily available at many places. By replacing it I always have a known-well starting point should further troubleshooting become necessary.

When it is properly cleaned, replace the battery. This is a must and not an option. It will fail if you do not take care of it now. All these steps are to avoid delayed failure caused by corrosion. Once all this is done, reassemble your phone and reevaluate. Until it is cleaned, everything will only be a guess.

While you work on your phone, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has a device with the same issues as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.

Repair is War on Entropy!

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Jadeed John Dauring crwdns2934231:0crwdne2934231:0
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