iPhone 6s boot white apples restart fault repair

Machine model: iPhone 6s

Malfunction: boot Stuck on Apple logo

iPhone 6s boot white apples restart fault repair Figure 1.

Maintenance process: plug in lighting cable, it can be powered on but there is no current, disassemble and measure charging connector 35 Boardview PP3V0 _ LAT _ Conn Short circuit lighting cable 19301.pin found that there was a problem with PP3V0_TRISTAR VCC, which went from VCC to USB management chips U4500,PMU.

There are several Capacitor through Fuse L5408_RF to U5411_RF, and it is found that U5411_RF has bruise marks under microscope.

iPhone 6s boot white apples restart fault repair Figure 2.

Measure the next Capacitor Short circuit, deduct it or Short circuit, and remove the conversion Short circuit Fuse L5408_RF.

iPhone 6s boot white apples restart fault repair Figure 3.

Then measure that VCC of C5403_RF C5404_RF road is still 0 to diode value. It seems that chip U5411_RF is broken. After replacement,Short circuit is troubleshooting, and the charging of the boot-in system is normal, and the maintenance is finished.