Xiaomi 161201-aa notebook no booting, maintenance without charging common failing

Xiaomi 161201-aa notebook no booting, maintenance without charging common failing

Xiaomi 161201-aa notebook no booting, the positive pole of 5V Capacitor and the ground are connected with external Connect the power supply source, plug in 19v and standby normally 0.015, press the start key screen booting up.Find a chip to replace, plug in and retest, the voltage has been normal, troubleshooting.

[machine model]Xiaomi 161201-aa notebook

[fault phenomenon] notebook no booting

[maintenance process]

Connected to a Xiaomi 161201-aanotebookThe customer said that the after-sales service could not have broken the no booting. The customer said that the battery could not be repaired.

It is found that DC power supply 0.009 is not normal when it is plugged in.Disassembly measurement, the motherboard does not have water damage, also does not have Short circuit.

Xiaomi 161201-aa notebook no booting without charging common failing maintenance Figure 1

Xiaomi 161201-aa notebook no booting without charging common failing maintenance Figure 2

It is found that there is VCC near the power interface, but it is only 5V, which is the small Capacitor welded with Hand solder in the above figure. This situation has been repaired before. It is obvious that common failing of Xiaomi notebook has not been boosted.

Xiaomi 161201-aa notebook no booting without charging common failing maintenance Figure 3

In order to judge whether the idea is correct, in the measurement, 5V Capacitor positive electrode and ground are connected to an external Connect the power supply source, plug in 19v, standby normal 0.015, press the start key screen booting up.This machine has tp-c interface and data transmission function. The default 5V is Xiaomi. The boost circuit is designed on the main board of Xiaomi. This chip is broken. It has been repaired before, but it will not be charged. That is because the notebook battery still has power. It can be turned on, and the charger doesn’t respond. This time, the battery is dead, so no booting.

Xiaomi 161201-aa notebook no booting, no charge common failing maintenance Figure 4

Found a chip to replace, plug in and retest, the voltage has been normal, troubleshooting, maintenance is over.

Xiaomi 161201-aa notebook no booting without charging common failing maintenance Figure 5

There is also a new Xiaomi pro, which is also the chip common failing. However, the new chip has been encrypted, so it is useless to replace it. In this case, you can buy a tp-c decoy device, directly remove the original interface, plug in the charger, and let the power supply detect that it is a high-power machine, so try to boost the voltage, but in this case, the data function of tp-c interface is not available,Eighty or ninety percent of our customers will definitely accept it if the machine can be used.