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iPhone X Won’t Turn On repair
Machine model: iPhone X
Customer description:mobile phoneWon’t Turn On
Test results: mobile phone Won’t Turn On, powered on short-circuit current 700MA
Fault analysis: According to the current analysis, the motherboard has been Short circuit Current protection.
First, open the Xinzhizao Soft software, find the iPad 2018 Boardview, and find the secondary VCC of the motherboard.
iPhone mobile phone Won’t Turn On maintenance figure 1.
Then, open schematic, find schematic of power management chip, combine Boardview, and measure each input and output of power management chip separately.
iPhone mobile phone Won’t Turn On maintenance figure 2.
After testing, it is finally found that the BOOST chip high temperature is serious.Capacitor was measured around the chip, and Capacitor Capacitor was found. But I wasn’t sure which Capacitor was, so I smoked Short circuit and powered on 1.8V to power up the line.
iPhone mobile phone Won’t Turn On maintenance figure 3.
Finally, a small Capacitor Short circuit next to the BOOST chip was found. After the auto power off source was unplugged, the fault was repaired.
iPhone mobile phone Won’t Turn On maintenance figure 4.
