Apple A1932notebook20v does not generate voltage and does not start (short circuit at common point)

Apple A1932notebook20v does not generate voltage and does not start (short circuit at common point)

[Fault model] Apple A1932 notebook

【 Fault Phenomenon 】 20v does not generate voltage and does not start.

[Maintenance process] I received a machine sent by a customer for repair, the model is Apple A1932 notebook, and the fault is that it does not turn on.

Plug in the adapter to see the current, and find that the voltage is only 5V. The current is 20mA, which is generally the standby condition is not met. Let’s first measure whether there is a short circuit in the power supply inductance of the motherboard, and remove the motherboard and find that the resistance of the common point is 0001. After careful observation, it is found that a capacitor is black, so directly deduct this capacitor.

Apple A1932 notebook 20v does not generate voltage, does not boot Figure 1.

The measured common point resistance value returns to normal, and the power-on test can be lit.

Apple A1932 notebook 20v does not generate voltage, does not boot Figure 2

[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.