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iPhone 12 Pro Max does not display repair
Machine model: iPhone 12 Pro Max
Mobile phone does not turn on
Maintenance process:
The problem with the iPhone 12 Pro Max is that the phone does not display when it is turned on.Measurement display touch BTB connector to find the 15th pin Short circuit, this pin pp7v3_DISPLAY_Avddh is 7.3v VCC of display screen, which is u9100 output to display screen BTB connector j11800.
iPhone 12 Pro Max does not display repair Figure 1.
This line Short circuit causes the VCC output of u9100 to be pulled low.
iPhone 12 Pro Max does not display repair Figure 2.
The rosin smoke method, a filter Capacitor in this line is the first to melt.
iPhone 12 Pro Max does not display repair Figure 3.
iPhone 12 Pro Max does not display repair Figure 4.
This Capacitor capacity is relatively large, can not be removed or not installed, after replacement, boot display normal, troubleshooting.
iPhone 12 Pro Max does not display repair Figure 5.
