HUAWEI P40 Pro Repair Cases

Share:

HUAWEI P40 Pro repair cases experience sharing.

P40 Pro Demo

Model: HUAWEI P40 Pro

Announce date: March 26, 2020

Case 1. The mobile phone can be used normally, but with current leakage and consumes power quickly.

Connect the motherboard with the DC power supply and find there’s a current leakage of 200mA.

200mA Current Leakage

Then separate the two layers of the motherboard, and found there are two anti-static diodes (D1801 and D1803) have been burned already.

Diodes

D1801 D1803

Since the two diodes are for antic static use. We’d better replace them with new ones, then assemble the motherboard to test, the phone can work normally.

Two Diodes

Case 2. Both the Wi-Fi, Bluetooth, and camera functions failed.

This kind of issue normally is caused by the common part of Wi-Fi & Bluetooth and camera circuits.

After checking, found it’s the Camera Power IC U2101 damaged.

case 2

HUAWEI P40 Pro Repair

Replace the chip with a new one, then both the camera and Wi-Fi functions are back to normal.

POWER SUPPLY For WiFi and BT

 Tips: based on the repair experience, this chip damage is a common problem for the Wi-Fi and camera issues.

Case 3. No Service and Camera Function Failed After Drop Damage

This kind of issue normally is caused by the poor connection of two layers of motherboards. 

Separate the two layers of motherboards with the hot air gun and heating platform, sure enough, part of the pads between the two layers are missing. As we can see from the below picture.

Pads Missing P40 pro

So let’s fix the missing pads one by one first.

Then assemble to test, after testing, all the functions are OK.

(This is also a common issue for the P40 Pro and most two-layer structure phones.)

Case 4. Cannot Boot

Defect phenomenon: cannot boot and with current leakage once connected with the DC power.

This kind of issue is normally caused by the capacitor short, we can use the rosin inspection method to find out the shorted components.

Use the rosin inspection method, to find out the shorted component easily.

Case 4

It’s the C1143 get damage

C1143

Check the schematic, it’s a filter-type capacitor. Remove it directly then phone back to normal.

(If your soldering handwork is good enough, better solder back a new capacitor with the same specification; if not, just remove it is also OK)

>> Visit REWA ACADEMY to learn more repair tips!

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...