iPhone 7 retarded after white apple unlimited restart repair

iPhone 7 retarded after white apple unlimited restart repair

Machine model: iPhone 7

Fault symptom: Stuck on Apple logo Restart repeatedly

Maintenance process: coder, WiFi and pad break off have been repaired. When the single board is turned on, watch the current 500 or so restart, and measure Capacitor diode value near Baseband power supply.

iPhone 7 retarded after white apple unlimited restart repair Figure 1.

iPhone 7 retarded after white apple unlimited restart repair Figure 2.

GND at both ends of C5604, the power supply of Baseband or Short circuit is removed, and the point of Baseband power supply leads to big RF and small RF. There are three Capacitor in Related circuit, all of which are diode value or GND, and the rest are resistors without GND at both ends.

iPhone 7 retarded after white apple unlimited restart repair Figure 3.

iPhone 7 retarded after white apple unlimited restart repair Figure 4.

iPhone 7 retarded after white apple unlimited restart repair Figure 5.

iPhone 7 retarded after white apple unlimited restart repair Figure 6.

Click on the other end of the resistor, all of which are connected to big RF, small RF, and there are the most points to big RF. Remove big RF diode value and come back.

iPhone 7 retarded after white apple unlimited restart repair Figure 7.

Replace RF and install Baseband power supply.Connect the power supply does not restart when the startup current exceeds 500, but the current returns to 0 at 1.8A or so. When the CPU shielding cover is disassembled, it is found that a coil is cracked.

iPhone 7 retarded after white apple unlimited restart repair Figure 8.

iPhone 7 retarded after white apple unlimited restart repair Figure 9.

Kill L1804.

iPhone 7 retarded after white apple unlimited restart repair Figure 10.

There are obvious marks of paint dropping and dropping Inveracious Soldering Oxygenation. Replace the coil, start the machine normally, and the maintenance is over.