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iPhone 8 Plus screen display abnormal fault repair
Machine model: iPhone 8 Plus
Malfunction: the screen display of the mobile phone is abnormal.
iPhone 8 Plus screen display abnormal fault repair Figure 1.
Maintenance process: it was cleaned after being put into water, but there was Backlight/Screen Half Black. After being disassembled, it was found that there was no large area of water damage on the motherboard, and there was no trace of water damage water damage on the backlight chip.
Measure the ground of backlight VCC and backlight circuit diode value, and display the ground value of BTB connector PP_DISPLAY_BL12_ANODE_CONN all the way backlight VCC OverLoad.
iPhone 8 Plus screen display abnormal fault repair Figure 2.
PP_DISPLAY_BL12_ANODE_CONN is connected to U5650 through Fuse resistor R5730. Check that Fuse resistor R5730 has burnt marks.
iPhone 8 Plus screen display abnormal fault repai Figure 3.
Replace a R5730 resistor, start the test, and repair the fault.
iPhone 8 Plus screen display abnormal fault repai Figure 4.
