Repair of alien p18e laptop without charging

After disconnecting the resistance and capacitance connected with the charging chip, it returns to normal, and the resistance and capacitance measured separately are normal. Since CSSP passes through the hole from here, the original resistance pin is disconnected, and the flying wire is re welded. After the flying wire, the CSSP and CSSP voltage return to normal, install the machine, enter the system, and the charging is normal.

Repair of alien p18e laptop without charging

Machine model: Alien p18e

Board No.: la-9931p

Fault phenomenon: unable to charge, discharge normal

Maintenance process: after dismantling the machine for inspection, it was found that the problem was not simple. When the customer sold it to me, he said it had not been repaired, but the battery was broken. As a result,Current protection isolation had been dried and rotten.

Repair of alien p18e laptop without charging
Maintenance of alien p18e notebook without charging Figure 1

Since the charger can be turned on, it shows that Current protection isolation should not be a problem. Master Lu suggested that the remaining time for charging was too long, so he thought whether the charging current detection fault was right or not. When the charging chip pin was detected, it was found that VCC was abnormal.

迅维实地学员分享:外星人P18E笔记本不充电维修 图2

Maintenance of alien p18e laptop without charging Figure 2

On the two resistors connected with the current detection resistor, one measured 20V and the other only 1V. After disconnecting the power supply, it was found that the CSSP pin was very low to the ground diode value.

迅维实地学员分享:外星人P18E笔记本不充电维修 图3

Maintenance of alien p18e notebook without charging Figure 3

After disconnecting the resistance and Capacitor connected to the charging chip, the resistance Capacitor measured separately is normal. Since CSSP is through the hole from this place, it is supposed that Short circuit in the half layer may be broken. Therefore, the original resistance pin is disconnected and welding Jump wire is renewed.

迅维实地学员分享:外星人P18E笔记本不充电维修 图4

Maintenance of alien p18e notebook without charging Figure 4

After Jump wire, CSSP and CSSP VCC returned to normal. After the battery was connected and the original adapter was inserted, the charging Inductor waveform was measured.

迅维实地学员分享:外星人P18E笔记本不充电维修 图5
Maintenance of alien p18e notebook without charging Figure 5

So the machine was installed and entered into the system. The charging was normal. At this point, the maintenance was finished.

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Maintenance of alien p18e notebook without charging Figure 6