HUAWEI Mate 30 Crack into Halves Damage Repair

Share:

HUAWEI Mate 30 Crack into Halves! Whether this phone can be fixed or not?

Mate 30

Model: HUAWEI Mate 30

Announced: 2019, September

Customer’s Feedback

The client was drunk and break the phone into halves in an unconscious state.  And when woke up the next morning, only the upper half (with the motherboard inside) of the phone can be found. 

Seems it’s not the first phone issue caused by the drunk client.

Cry with Laughter

Troubleshooting

No matter why and how the phone gets damaged like this, let’s have a check the motherboard first.

Remove the screws and take out the motherboard

01 Remove the cover and screw take out the motherboard

The motherboard looks good, no obvious deform or damage

02 The motherboard looks good

Connect the motherboard with the DC power supply, trigger to boot

03 Boot the board with DC power supply

The boot current jumped from 100mA to 40mA and was then fixed at 40mA

This defect phenomenon with a high chance is caused by the CPU power supply or the CPU dos not work.

Repair Process

Remove the shielding cover on the CPU chip and check carefully, the CPU looks fine.

Touch the small inductors around the CPU chip with the tweezers slightly to check. After checking, there is no component loose or missing.

Check the other side of the motherboard. The shielding cover on the PMU IC has gotten deformed, let’s remove the shielding cover and have a check

04 The shielding cover on the PMU IC also get deformed

PMU IC looks good and the small components around it are also in the good conditions

04 Check the phone components around the PMU

A small inductor is loose and easy to be removed when pushing with the tweezer

05 A small inductor is loose and easy to removed when pushing with tweezer

However, based on the repair experience, the small inductor missing won’t cause 40mA no boot issue.

Anyway, let’s solder it back to position first.

06 Solder the chip back to position

After soldering back the small inductor and testing again, the issue is still the same (boot current fixed at 40mA).

Will the issue be caused by the CPU power supply? Let’s connect the DC power supply and measure the voltage values.

07 Measure the PMU voltage values

All the voltage values are OK.

So the issue might be caused by the poor connection of the two layers of the motherboard or the CPU.

Let’s resolder the CPU to have a try first.

  • Remove the thermal grease on the CPU and black glue around the CPU
  • Heat up and remove the upper RAM layer first
  • Then remove the lower Kirin 990 layer CPU

After removing the CPU, there are some pad corrosive traces, so we’ll need to clean the glue and tins on the PCB pads.

Then measure the voltage value of the motherboard again, it shows the current is 5mA. This means the motherboard is fine.

08 Clean the glue and solder tin balls on the CPU

Reball and solder the CPU chips back to the motherboard.

09 Solder back the CPU

Then power on to test again, this time the boot current is normal, the phone can be booted normally.

Mate 30 Crack into Halves

The motherboard is fixed, and then let’s assemble the board to have a test

Mate 30 Crack into Halves

With the new screen, new battery, new housing cover, and the other new parts assembled, the Mate 30 can be booted normally, and test the functions, display, touch, audio, Wi-Fi, etc. are all OK.

The issue gets resolved perfectly by CPU resoldering.

11 Mate 30 Crack into Halves 2

>>> Visit REWA Academy to light up your repair skills

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...