Repair of Redmi note8Pro mobile phone without taking pictures when it enters the water

Non-photographing caused by water inflow is mainly power supply corrosion and i2c corrosion.

Machine model: Redmi note8Pro

Fault phenomenon: the mobile phone does not take pictures when it is flooded.

The machine is flooded. Turning on the camera prompts that you can’t connect to the camera. Please restart your phone.

Maintenance of Redmi note8Pro mobile phone without taking photos when it enters the water Figure 1

Fault analysis:

Non-photographing caused by water inflow is mainly power supply corrosion and i2c corrosion.

Maintenance process:

Observe that the camera seat of the motherboard is very clean, and the photo-sensitive seat on the left side of the front seat has corrosion marks.

Maintenance of Redmi note8Pro mobile phone without taking photos when it enters the water Figure 2

Clean it again, and the boot failure remains. Careful observation of the rear main image head seat found a foot virtual welding. When the tweezers are pulled, the solder feet have come off. Add some tin paste.

Maintenance of Redmi note8Pro mobile phone without taking photos when it enters the water Figure 3

After welding, the resistance returned to normal, and the failure of startup test remained.

Maintenance of Redmi note8Pro mobile phone without taking pictures when it enters the water Figure 4

From the point map, it is known that the power supply of the rear main camera comes from several pentagonal tubes in the shielding cover next to it.

Maintenance of Redmi note8Pro mobile phone without taking pictures when it enters the water Figure 5

Dismantling the shield is very clean. The main camera i2c is directly connected to the cpu, and there is no pull-up in the middle.

Maintenance of Redmi note8Pro mobile phone without taking photos when it enters the water Figure 6

The solder-off pin is all i2c, and now the resistance is normal. Considering that the overall motherboard is slightly corroded, we basically rule out power supply and i2c.

Installing a rear main camera alone can actually take pictures when starting the test.

Maintenance of Redmi note8Pro mobile phone without taking photos when it enters the water Figure 7

So each camera was installed one by one, and it was found that when the front camera was installed, the camera could not be turned on, and the machine commander could not turn on the front camera according to the phase icon. So we are here to check the front and seat.