HUAWEI P40 Repair Cases Sharing

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HUAWEI P40 repair cases sharing.

Model: P40

Announced: 2020, March 26

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Case 1. The cameras turn off automatically and Wi-Fi cannot work

Received the phone and tested it, as the customer described the phone camera turns off automatically, and try to open the Wi-Fi button but it turned to grey shortly.

1 Wifi turns to grey

Troubleshooting: based on the repair experience and the circuit block diagrams of P40. The Wi-Fi and camera share a 1.8V voltage. When the main camera with a problem, the power supply for the Wi-Fi will be pulled down. So the Wi-Fi issue might be caused by the camera.

Disconnect the main camera flex cable only and remain the rest camera connectors connected, then test the camera and Wi-Fi functions again. 

2 Detach the Main Camera Module

Now, the camera and Wi-Fi functions work fine

HUAWEI P40 Repair

So the issue should be caused by the main camera module damage, the issue can be resolved by replacing the main camera with a new one.

P40 Rear Camera Module

REWA ACADEMY

Case 2. No Boot After Dropping Damage

The drop damage causes the SoC upper layer short damage. Replace it with a new one, then the phone can boot normally.

MB P40

REWA ACADEMY

Case 3. No Wi-Fi Issue Caused by Drop Damage

For the Wi-Fi issue caused by drop damage, there’s a high chance it’s the Wi-fi chip gets poor soldering or the Wi-Fi crystal oscillator with inner line broken.

First, let’s check the motherboard under the microscope, as we can see there’s a deformation on the shielding cover.

Deformation

The shielding cover with some damaged signs, let’s remove the shielding cover and check carefully.

After checking we can see the crystal oscillator is cracked already. Replace the crystal with a new one, then assemble the phone to test, the Wi-Fi function back to normal.

Crystal Oscillator

(Tips: for the removed shielding cover, if you have a new or good shielding cover you can solder it back with medium-temperature solder paste + soldering iron station

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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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