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Announced on October 13th, 2020, the iPhone 12 mini is a smaller version of Apple's iPhone 12. It features a 5.4-inch OLED display, an A14 Bionic processor, and dual rear cameras.

Why is Face Id not working and Black Screen?

My phone was submerged for a few seconds and was fine immediately after, but a bit later it began to get lines across the screen. Then, on a later date, it went entirely black with occasional times where I could power it on to see something although it would have a magenta or green tint.

Now, its black, hasn't turned on really, and flashes or shows a green/white bar at the bottom of it or another place. Face Id also doesn't work and I'm wondering why.

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Hi @jillhelp

Check the status of the LCI for your model. If it is red then water has entered the phone.

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. The corrosion starts immediately and is ongoing until it is completely cleaned away

Do not try to charge or to turn on your phone anymore and then remove the battery as soon as possible from the phone to minimize any further damage. Given that you have been using it for a while since the phone got wet, you can only try to see if it can be fixed

Then you need to dis-assemble the rest of the phone and clean all the affected parts using Isopropyl Alcohol 99%+ (available at electronics parts stores) to remove all traces of corrosion and water. If possible do not use "rubbing alcohol" as in some cases this is only 70% IPA or less, can contain additives which may leave conductive residues and is not as effective. If you do have to use it check the label to verify the amount of IPA. The higher the percentage of IPA the better

Here is a link that describes what happens. Electronics Water Damage

As always with electronics, especially surface mounted pcb be gentle when handling and especially when brushing away the corrosion. You do not want to remove any components from the board. Remove the shields that may be covering some components as the water may have got in under there. The ends of any flex cables and their connectors need to be cleaned as well

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

Here is the ifixit iPhone 12 mini repair guide that may help.

If this process seems too daunting, take your phone to a reputable, professional phone repair service, experienced in liquid 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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crwdns2944067:06crwdne2944067:0:

@jayeff - I would check the LCI, but I can not open the sim tray. I already made another post on that if you would like to help with that too.

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@jillhelp

Here's the ifixit iPhone 12 mini SIM Tray Replacement guide that may help. You may have to use a bit of force to eject it.

If still no good you may have to open the phone anyway. Perhaps the water has caused more damage than you thought.

Does the case seem to be swollen?

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@jayeff No, it does not seem to be swollen. I have also never opened the sim tray

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@jillhelp

What happens when you push the pin into the sim tray eject hole, does the tray come out even little bit e.g. enough to grab it with tweezers or to place a fingernail behind the edge of the tray to prise it out?

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No, it doesn't come out even a bit. In fact, in my personal opinion it seems like the sim ejector pin doesn't go all the way into the pin hole.

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Jill crwdns2934231:0crwdne2934231:0
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