The iPhone 13 Pro's baseband CPU has been upgraded to the Qualcomm X60. It is believed that the phone signal will be more stable than previous models.

Then we see if a single logic board of iPhone 13 Pro can trigger the boot-up. Power the logic board with a Direct Current Supply.

Connect the display. Trigger the boot-up with tweezers.

We can see that iPhone 13 Pro took longer to trigger the boot-up than previous models. It takes 8-10 seconds for the Apple logo to appear on the screen. This may be caused by the system.