There is no way to restart? IPhone11 dead again? The solution is revealed

There is no way to restart? IPhone11 dead again? The solution is revealed.

The customer described that the charging of iPhone 11 crashed, and it could not enter the system after restarting. After checking the restart report, the fault point was found immediately. The specific maintenance process is as follows:

“Machine model” Apple iPhone11

[Fault Phenomenon] Restart

[Maintenance process]

Received an Apple 11 repaired by a customer, and the customer saidmobile phoneAs soon as the charger was plugged in, it crashed. Now the mobile phone has only 6% power left, and it can’t be recharged. So I quickly sent it to us to see if it can be repaired. It’s really a delay without the mobile phone.

Apple iPhone11 can’t restart in the system Figure 1

After receiving the mobile phone, I turned it on and saw that there was really only a little power left. When I plugged in the charger, I immediately lit up the Apple logo. If I didn’t plug in the charger, I didn’t restart it for a long time. It seems that there is something wrong, but before disassembling the machine, let’s take a look at the restart report.

Apple iPhone11 can’t restart in the system Figure 2

Since there is a restart, there must be a restart record. If you want to repair an Apple restart, you must be able to read the restart record and restart code. Otherwise, a simple external configuration problem may make some people do CPU, which is not worth the candle.

Open the restart report, and find the latest restart record with the beginning of panic Full. The specific query method is available from Xin Zhizao, so we won’t say much here. Next, look at the following figure:

Apple iPhone11 can’t restart in the system Figure 3

Apple iPhone11 can’t restart in the system Figure 4

In the second line of the figure, there is a code starting with @Apple, and the suffix is CS42L77Audio. This is the problem. Let’s open the 11.schematic diagram, search CS42L77, audio, needless to say, is the audio problem, and CS42L77 can search the audio chip with the location number U4700 in the schematic diagram. Now that the fault point has been found, we can just dismantle the motherboard and build it. Dismantle the chip, find a new chip to replace it with tin, and plug it into the charger again. OK will not restart, and the sound test is normal.

Apple iPhone11 can’t restart in the system Figure 5

Apple iPhone11 can’t restart in the system Figure 6

[Maintenance result] Install the motherboard into the mobile phone, and start the test. The mobile phone is normally booted into the system, and the functions such as charging, WiFi, voice, compass, vibration and telephone are normal. The maintenance is over here.

This case was originally provided by Xunwei Quick Repair Flagship Store, and it is forbidden to reprint without authorization!