iPhone 11 Pro Max suddenly turned off and now it won't turn on

Hey all!

I was given an iPhone 11 pro max and the previous owner said that it was working fine, and the next day the phone wouldn't turn on. it's worth mentioning that some days before, a message from the system popped up a liquid-detection alert but they didn't care. When I got it, I tried making the phone to enter diagnostic mode, tried to do a hard reset but nothing. My mind is really messed up, and I don't know any other possible things to try. The thing I suppose that might cause this whole issue is the charging PCB (because of that alert that the system popped up). Any possible things to try?

Thanks in advance!

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