Xiaomi 11 mobile phone photo flash back repair

Machine model: Xiaomi 11
Malfunction: mobile phone shoot flicker exit
Maintenance process: the customer describes the normal use of the mobile phone, turns on the mobile phone Camera flicker exit, and turns on Camera directly to screen is black or frozen for one or two seconds. Then the flicker exit button just appears.

Xiaomi 11 mobile phone photo flash back repair figure 1.

Fault analysis: the mobile phone Camera flicker exit is either VCC or i2c bus has a problem.
Maintenance process:

Xiaomi 11 mobile phone photo flash back repair figure 2.

The front Rear Camera of this model has a camera power supply U7306 in addition to the pentagonal MOSFET VCC.

Xiaomi 11 mobile phone photo flash back repair figure 3.

Redo this chip directly.

Xiaomi 11 mobile phone photo flash back repair figure 4.

The boot failure is still the same, and the image head BTB connector diode value is normal before and after playing. When testing i2c VCC, it is found that there is no VCC.

Xiaomi 11 mobile phone photo flash back repair figure 5.

There is no VCC in the CCI_I2C1_SDA and CCI_I2C1_SCL of the rear-camera main camera when they are turned on, and there is no VCC in the front-camera CCI_I2C0_SDA and CCI_I2C0_SCL when they are turned on.

Xiaomi 11 mobile phone photo flash back repair Figure 6.

It is found that the transmitters of these two i2c are both CAM_IO_1P8.

Xiaomi 11 mobile phone photo flash back repair Figure 7.

The camera power supply U7306 is still found.

Xiaomi 11 mobile phone photo flash back repair Figure 8.

As we have redone this adhesive power supply, we can basically eliminate Inveracious Soldering and damage. After checking its working conditions, it is found that there are two i2c buses.