How to solve the problem that Apple xs max can't boot? Reason for opening or closing

I'm an Apple maintenance engineer. Let me talk about it.

First, the general reason why the iPhone can't boot:

1. It may be that the hardware of the iPhone motherboard is damaged, which makes it impossible to boot.

2. It may also be that the battery of the iPhone is in poor contact or damaged, which makes it impossible to boot.

Second, the fault handling method:

1. When the iPhone suddenly goes black, crashes, can't be turned on, and doesn't respond, you can try to hold down the power and the Home button of the main screen at the same time 10 seconds or more. See if we can force a reboot.

2. If the forced restart is successful, you can see an Apple logo on the screen. After successful restart, it can be used normally.

Third, if the above method fails, it means that the motherboard is a problem and can only be repaired.

Motherboard failure is not replacing the motherboard. The motherboard consists of hundreds of chips, such as cpu, baseband, power chip and power amplifier, which only need to be replaced.

The cost of chip replacement is generally several hundred, and the motherboard replacement is three or four thousand.

Many small shops don't know how to repair this high-end model, they all change the motherboard. Don't believe it.

The picture below shows the details of repairing the motherboard for mobile phones at ordinary times. Just fix the chip on it