Hi,
Did you also remove the shields that are covering some of the components, you didn’t say? The water may have got in under them and the corrosion that has started to occur there may be still continuing to damage them, more so with the power still connected to the systemboard. Also all flex cables will need to be disconnected and their ends and their associated systemboard cable connectors need to be cleaned as well
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.
Rice does not stop the problems caused by corrosion. Rice is for dinner, not repair.
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. 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 video that shows how to dis-assemble the phone 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,
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