Apple MacBook A1466 notebook power-on does not trigger repair

Before dismantling, there was no corrosion by visual inspection, and it was found that a fuse F7140 was 8.45V at one end and 4.1V at the other end, which jumped repeatedly.Drag a wire directly, and then power on it to trigger automatically. After repeated tests, it is normal.

Before dismantling, there was no corrosion by visual inspection, and it was found that a fuse F7140 was 8.45V at one end and 4.1V at the other end, which jumped repeatedly.

Drag a wire directly, and then power on it to trigger automatically. After repeated tests, it is normal.

Machine model: Apple MacBook A1466 notebook

Motherboard model: 820-3437-B

Trouble: It used to work normally, but when I took it out recently, I found that I couldn’t start the machine.

Maintenance process:

Power-on shows a yellow light but it doesn’t trigger. Remove the back cover and unplug the battery, but it doesn’t power on automatically. Just remove the motherboard, and there is no corrosion by visual inspection before removal.

Apple MacBook A1466 notebook power-on does not trigger maintenance Figure 1

When the CPU fan was removed, the capacitor C7372 cracked directly when touched.

Apple MacBook A1466 notebook power-on does not trigger maintenance Figure 2

Dismantle this capacitor quickly. After dismantling, the amount is not short-circuited, and it is still not triggered when it is energized. However, when measuring the voltage, it is only 4V at first. But the data will be 1.5V for a while, 4V for a while, and jump repeatedly.

Measure the voltage from PPDCIN to 14V+, open the point bitmap to trace, and find a fuse F7140 with 8.45V at one end and 4.1V at the other end, which jumps repeatedly.

Apple MacBook A1466 notebook power does not trigger maintenance figure 3

When the power supply is disconnected, Fengming can’t open it. It seems that this insurance has also been blown up. Just drag a wire directly, and then power it on automatically. After repeated tests, it is normal.