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HUAWEI Mate 40 Pro Boot Black Screen for repair
Machine model: HUAWEI Mate 40 Pro
Fault phenomenon: the screen does not display when the mobile phone starts screen is black or frozen.
HUAWEI Mate 40 Pro Boot Black Screen for repair Figure 1.
Repair process: start the machine for test, the screen screen is black or frozen of mobile phone is not displayed.It was found that the phone had been repaired after dismantling the machine. The CPU was redone before.
HUAWEI Mate 40 Pro Boot Black Screen for repair Figure 2.
HUAWEI Mate 40 Pro Boot Black Screen for repair Figure 3.
HUAWEI Mate 40 Pro Boot Black Screen for repair Figure 4.
When the mobile phone starts screen is black or frozen, priority is given to the display of BTB connector and its nearby components. The first test shows BTB connector diode value, and it is found that the second pin diode value is ol, indicating that the pin connecting line is disconnected.Compared with Boardview, the normal diode value should be 450 or so.
HUAWEI Mate 40 Pro Boot Black Screen for repair Figure 5.
separate under the small board, found a place in the lower layer of the small plate pad break off.
HUAWEI Mate 40 Pro Boot Black Screen for repair Figure 6.
Scraping out the wiring,Jump wire is connected to PAD, and welding small board is renewed.
HUAWEI Mate 40 Pro Boot Black Screen for repair Figure 7.
The mobile phone Normally booting up is installed and tested. All functions are normal and the fault is repaired.
