Chosen Solution

hello for all wish you all nice day please can you tell how I can know if my iphone 8 plus has water damage i see some topics saying from the sim try slot and other said from motherboard can you please tell me how i can know using both methods ??? note : I attached an 8 plus motherboard tell me please where is the indicator

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the only way to really determine water damage is to open the phone and look at the LCI. if you take a look at your picture of the motherboard you posted, see the square at the upper left. look at the thin part of the board where this connects. there is a white oval just above a flex connector. that’s the LCI. if it contacts liquid, it will turn red.