Drop Damaged HUAWEI Mate 40 Pro Repair

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Received a serious drop damaged HUAWEI Mate 40 Pro

HUAWEi Mate 40 Pro

Model: Mate 40 Pro

Announced: 2020, October 22

Defect Phenomenon

Because of the quarrel, the wife smashes the mobile phone in anger, felt regret after calming down, then sends the phone to our repair shop and wishes the phone can be fixed. 

  • Both the front screen and back cover are cracked
  • The phone cannot be booted

01 The cracked phone

Troubleshooting

Remove the back cover and protect the cameras with the sticker

02 remove the back cover and protect the cameras with sticker

Then take out the motherboard and check the cosmetic carefully, find the motherboard was deformed

03 The motherboard has get deformed

Even the shielding cover can be taken off easily.

04 even the shielding cover can be removed easily

A lot of inductors around the chip are loose and dropped

05 a lot of inductors around the chip are loose and droped

Remove the inductors directly and also check carefully to see if there are still other poor soldering components and chips. After checking, then try to boot with the DC power supply connected.

Luckily, there is no current leakage. This means there is a higher chance to get the phone fixed.

06 There is no large current leakage

Then let’s check the conditions of the CPU and the UFS chip, remove the thermal grease, and clean with PCB cleaner, the CPU and UFS chip looks fine.

07 looks fine

So, let’s put back the inductors one by one. Then check the boot current again.

08 lets put back the inductors one by one

The phone still cannot be booted.

Carefully check with the thermal camera, and multimeter and finally find out there is an inductor is damaged.

09 Multimeter and thermal imager

10 this inductor is damaged

Replace the below inductor with a new one then test again, and the boot current is back to normal.

Temporarily assemble the phone and trigger the boot process, boot current curve is normal, and can feel the vibration of the phone. But no display…

Based on the repair experience, the no display should be caused by the poor soldering of the two layers of the motherboard. Measure the diode value on the display and touch connector, it’s higher than normal value

11 Measure the diode value on the display and touch connector

Recombine the two layers of the motherboard and test again, the phone can be booted normally and the display function is also back to normal

12 recombine

Drop Damaged HUAWEI Mate 40 Pro

Summary

The issue was fixed by

  1. solder back the missing and loosen inductors
  2. replace another damaged inductor (we find it with the help of the multimeter and thermal imager)
  3. recombine the two layers of the motherboard

No matter what happened, try your best to control your temper and don’t be angry. If you cannot help to get angry at least don’t smash your phone. 

>>> Join REWA Academy to light up your repair skills!

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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.

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