A1708 boot into the system is very slow, especially stuck after entering the system (the current detection line is disconnected)

A1708 boot into the system is very slow, especially stuck after entering the system (the current detection line is disconnected).

A MacBook pro A1708 is slow to boot into the system, which is very stuck. After testing, it is found that the current detection line is broken. Then how can you repair this problem? The following specific methods:

[Fault model] A1708

[Fault phenomenon] Booting into the system is very slow, and it is particularly stuck after entering the system.

[Maintenance process] I received a machine sent by a customer for repair, model A1708. The fault is that the boot is very slow to enter the system, and it is particularly stuck after entering the system.

When the motherboard is removed and carefully checked, the probability of Apple’s normal use is still relatively small, so this is a water inlet machine, because when the motherboard is removed, it is found that some capacitors are a little black, either water or moisture.

It was found that a capacitor under the charging chip had been burnt black. After deducting it, it was found that there was something wrong with the pad below, and the measured resistance was normal. However, it seemed that the capacitor was disconnected from R7061, and it was really unreasonable after the measurement.

A1708 boot into the system is very slow, especially after entering the system. Figure 1.

Check that this line is the signal line from the charging IC to the current detection resistor, and fly the line directly to connect the broken lines.

A1708 boot into the system is very slow, especially after entering the system. Figure 2.

A1708 boot into the system is very slow, especially after entering the system. Figure 3.

After the start-up test of the flying line, the system is no longer stuck and returns to normal.

[Maintenance result] The mainboard was installed, and the startup test was successfully lit. The recording, camera, sound and WiFi of the system test were normal, and the stress test of the baking machine was normal for half an hour. The maintenance was over.