Options. Unplugging the battery connector would not have caused any damage. In your description you say it is an LCD screen and these can be problematic and you should have purchased an OLED screen. If it is an OLED screen I would back the phone up and do an update or restore and see if the problem persists, if it does you will need to return
So I just had my iPhone XS Max screen replaced and she is no longer water resistant. Before i cracked screen and had replaced i have taken and used my phone in water numerous times. Then have it replaced. Sits next to hot tub, gets splashed and is now ruined. Will apple replace my phone, i have AppleCare but they say no water damage!
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iphone xs max display replacement