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iPhone 8 Plus screen display exception repair
Machine model: iPhone 8 Plus
Symptoms: The screen display is abnormal.mobile phone The display screen in the lower right corner of the screen is not bright, and there is no backlight. 
iPhone 8 Plus screen display exception repair Figure 1.
Maintenance process: this is usually caused by a problem with the backlight VCC. Dismantle the machine and take down the motherboard. The measurement shows that BTB connector J5700 found that PP_DISPLAY_BL34_ANODE_CONN is connected to the ground diode value OverLoad, which is disconnected.
iPhone 8 Plus screen display exception repair Figure 2.
Looking up the drawing, it is found that this backlight VCC is supplied to display BTB connector through R5733 Fuse resistor.
iPhone 8 Plus screen display exception repair Figure 3.
During the inspection, it was found that R5733 Fuse resistor had burnt out.
iPhone 8 Plus screen display exception repair Figure 4.
SMD REWORK STATION removed, solder ball short-circuit.
iPhone 8 Plus screen display exception repair Figure 5.
Installation test, boot display is normal, function is normal, and maintenance is over.
iPhone 8 Plus screen display exception repair Figure 6.
The fault is abnormal screen display caused by damage of resistor R5733 of PP_DISPLAY_BL34_ANODE_CONN backlight VCC Fuse.
