iPhone 12 Pro Cannot Be Booted After Water Damage

Share:

The client’s water-damaged iPhone 12 Pro cannot be booted, and it was sent to the repair shop after water damage for around 20 days. 

 01 The cosmetic is fine

Troubleshooting

First, disassemble the phone and take out the motherboard

  • Remove the two screws on the bottom
  • Place the phone on the heating platform, and set the heating temperature to around 70℃ to soft the glue between the screen and the frame
  • Insert the slight card then the screen can be separated easily

02 The phone get disassembled easily

There are two water damage indicators

  • The one near the SIM card reader is fine
  • The one near the earpiece speaker turned red

03 water damage indicator

Which indicates the water or moisture is getting into the motherboard through the speaker mesh.

Protect the front camera, infrared camera, and dot projector first

04 Protect the front camera infrared camera and dor projector first

Take out the screen and have a check, there’s no obvious damage on the screen

05 Take out the screen and have a check theres no obvious damage on the screen

Then take out the motherboard and connect it with the DC power supply machine to have a check

It’s large connect once connected with DC power supply

06 Large current once connected with the DC power supply machine

It means there is a short on the motherboard. Let’s check the cosmetic of the motherboard under the microscope carefully again, the board looks fine, the components are clean, the motherboard does not get deformed, and the middle layer also with very nice soldering and connection.

07 The components are OK side effect also OK

After measuring, we find the PP_VDD_MAIN is shorted to ground

08 After measuring we find the PP VDD MAIN is shorted to ground

Connect with the DC power supply machine and observe under the thermal image camera, cannot find out the obvious shorted components. So the defect component must be located on the inner side.

09 no obvious hot

We have to separate the motherboard with the heating platform and the hot air gun to check the inside components. After checking, we find something abnormal. The capacitor C413_E with two colors. Based on the repair experience, the inside of this capacitor must be damaged.

10 The capacitor justed turned colors

two colors

Remove the C413_E directly, and no need to solder it back

11 remove the C413 E

The reason of no need to solder it back

  1. It’s close to the middle layer on the left side, heat to solder it back may cause two layers poor connection
  2. On the right side is the Baseband CPU, if overheated, may also lead to baseband CPU poor soldering
  3. There are many other filter type resistors on the PP_VDD_MAIN, lost one won’t make a big difference

After removing this capacitor and measuring the diode value again, the short on the PP_VDD_MAIN is gone.

Then recombine the two layers of the motherboard and assemble the phone.

12 Clean the pads on the middle layers then rebonding the two layers of the motherboard

13 Assemble the phone

Power on to test, all the functions are OK.

12 Pro Cannot Be Booted

The issue gets resolved by removing the filter type C413_E on the PP_VDD_MAIN

>>> iPhone 12 Pro Online Course will be launched soon, stay tuned to the REWA Academy and Youtube Channel to know the latest news.

Share:

REWA Academy

As an enthusiastic educator and expert in mobile technology, REWA Academy has dedicated its career to empowering individuals through technical education. With a keen focus on cellphone repairs, they have developed comprehensive online and offline courses at REWA Academy. Their expertise spans a wide array of areas, including iPhone repair training, phone hardware, software, and advanced troubleshooting techniques. Through their writings, they aim to demystify mobile technology complexities, making it accessible and understandable for both novices and professionals in the field.

Advanced Phone Repair Course

Do you aspire to become a professional in the phone repair industry? If so, visit REWA Academy to learn in-depth phone repair from industry experts.

Leave a Reply

Your email address will not be published. Required fields are marked *

RELATED Articles

How to Fix the iPhone 12 Pro Max Touch Not Working

How to Fix the iPhone 12 Pro Max Touch Not Working

When your phone’s screen becomes unresponsive, the usual solution is to replace it. However, screens are quite expensive these days. In this article, we will introduce an alternative method of...

Samsung A53 Won’t Turn On Repair

The Samsung A53 model is widely recognized as one of the most desirable smartphones currently available. However, like all electronic devices, it is susceptible to occasional operational issues that may prove...

Use the Vivo T1 In the Rain and Won’t Turn On

The client uses the Vivo T1 in the rain and won’t turn on after that. Let’s see the detailed troubleshooting and fixing process. Model: Vivo T1 Announced: 2021, October 20 Defect...