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HUAWEI Mate 30 boot screen is black.
Machine model: HUAWEI Mate 30
Fault phenomenon: The customer describes that after the phone is turned on by pressing the power-on button, the screen brightness is low, and when fast-forwarding the system, the screen is black, and it doesn’t light up directly.
Maintenance process: after getting the mobile phone, start the test, and the fault phenomenon is consistent with the customer’s description.
HUAWEI Mate 30 boot screen is black Figure 1.
It was found that the screw hole on the side of the main board display seat was damaged and disconnected, but it was not completely disconnected. This situation was generally caused by improper operation during disassembly and assembly.
HUAWEI Mate 30 boot screen is black Figure 2.
HUAWEI Mate 30 boot screen is black Figure 3.
Looking at the drawings, we know that the broken circuit is AMOLED_ELVDD, the display power supply on the display stand J1901. Because the circuit is not completely broken, the boot LOGO interface can be displayed normally. When the working current of the display is large, the current is insufficient, and the display screen will be black and not displayed.
HUAWEI Mate 30 boot screen is black Figure 4.
Repair the broken line, apply green oil, and repair the fault.
HUAWEI Mate 30 boot screen is black Figure 5.
HUAWEI Mate 30 boot screen is black Figure 6.
