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Released September 20, Apple's largest and most expensive 2019 smartphone features a 6.5" OLED display, a triple-lens camera system, and greatly improved battery life. Successor to the iPhone XS Max.

iPhone turns off when removing case

Iphone 11 PRO MAX, turns off while removing covering case. Only on the top right corner of the phone, when looking from the screen facing me.

Is this a logic board issue or could it be a loose connector or something else?

For context, the battery was recently changed but not by me.

Whats my best course of action at this point?

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It sounds like something may be shorting to ground, or some other electrical line when under pressure (assuming there is some flexing and struggling when removing the case). Most likely something is getting squished into something else it isn't supposed to be. Could be any number of things, but I will specifically call out that the main power rail for this phone does go to the display, so this could be as simple as the cable for the display is getting pinched, or was damaged.

If the battery was changed recently I would take it back to the person who did the repair and let them know since it sounds like this was something that started as a result of the repair.

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