I dropped my phone on tub of water so camera is not working
Camera is not working because i dropped it on a tub of water
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Did it drop into the water or only onto the tub and it did not get wet?
If it fell into the water:
Water, 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. The corrosion starts immediately and is ongoing until it has been properly cleaned away.
First do not try to turn on or charge your phone and then remove the battery as soon as possible from the phone to minimize any further damage.
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 etc. Do not use "rubbing alcohol" as in some cases this is only 70% IPA or less, can contain additives and is not as effective. If you do check the label to verify the amount of IPA. The higher the percentage of IPA the better.
Here is a link that describes the process.
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. You may also have to remove any shields covering the components as water may have got in under them. Also any flex cable ends/cable connectors will need to be cleaned as well
Hopefully after you have done all this the phone might possibly work correctly again.
Here’s the ifixit Xiaomi Mi 8 repair guide which may be of some 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,
If it didn’t get wet:
Use the repair guide above to access the camera and check that it is still connected OK
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