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i have an iphone 5s that overheated in 2019 and died completely, which was later submerged in water for about half a day and smashed (stupidly), is there any chance whatsoever of recovering the data off the board? the phone in a new housing, battery, display, etc just warms the battery like it did before it was water damaged, is it a lost cause?
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probably not. once the phone innards get wet, your worst enemy is time. the quicker you can get it dried, the better. the longer the liquid sits, especially in a closed phone, the greater the damage from corrosion.
here's what i recommend. get the motherboard out and give it a good 1+ day soak in 99%+ isopropyl alcohol (IPA). if you see any visible residue or corrosion, give it a very gentle scrub with a very soft tooth brush (like the kind dentists give free to young kids). after the scrub, give it another soak (at least half a day this time) in clean IPA. agitate a little then take it out and give it one final rinse with clean IPA. bend a paperclip open and pop one end through an open hole so you can hang it to dry in a slightly (or much) warmer room than usual room temperature. make sure the humidity is as low or lower than normal (ie, using a hot shower to raise the air temperature of the bathroom would defeat the purpose - i know this should be obvious, but sometimes ya just gotta say it). let it air dry for at least a day or two.
at this point, if you have known working and dry parts, you can reassemble and give it a shot. i'd be hesitant to use the original parts because of both the liquid and physical damage.
at this point it's a crap shoot. if the board is dead, no amount of IPA will resurrect it. but i have used this method to bring motherboards back to life than had suffered major liquid damage.
good luck to you
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yeah, thanks for confirming what i had feared. oh well, i will now backup my phone and be more careful next time
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