iPhone 12 loses power to touch PP_VDD_MAIN, you can use turpentine to save costs or invest in a thermal camera to repair more effectively. Here I use hard turpentine, see melting in the area in the picture below, remove the capacitor ok.
You can refer to the touch detection here: https://www.lekhuyenmobile.com/2021/06/huong-dan-sua-iphone-12-mat-nguon.html
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Good luck!