iPhone X screen display flower screen repair

iPhone X screen display flower screen repair

Machine model: iPhone X

Fault symptom: Blurred screen is displayed on the mobile phone screen.

Test results: The mobile phone can be turned on normally, and all functions are normal. Screen Blurred screen.
Fault analysis: All functions of the mobile phone are normal, only the screen Blurred screen, and the maintenance direction is in the display circuit part. However, the performance of the fault proves that all signals on the display screen exist, and Blurred screen should be an abnormality of the related components of the display screen signal circuit. Focus on checking and displaying FPC BTB connector and GPU circuits.
First of all, replace the measuring screen, eliminate the problem of the screen itself, and the fault remains the same.
Open the Xinzhizao Soft software, find the annotation drawing of Huawei iPhone X, and find some circuits showing FPC xt14401 and GPU.

iPhone X screen display flower screen repair figure 1.

According to the parameters of Boardview diode value, the display screen FPC BTB connector was measured, and no abnormality was found.

iPhone X screen display flower screen repair figure 2.

Search for GPU-related circuits in schematic, and find Boardview to measure the position diode value. No abnormality is found.

iPhone X screen display flower screen repair figure 3.

iPhone X screen display flower screen repair figure 4

iPhone X screen display flower screen repair figure 5.

iPhone X screen display flower screen repair figure 6.

Then, the motherboard is powered on, and the measurement shows that BTB connector works VCC, and GPU inputs VCC. No VCC is abnormal. However, during the measurement, it was found that the shape of one VCC VCC of GPU was completely different from that of the next one. It was determined that the VCC was not original. After replacing the original VCC, the fault was repaired.