Lenovo E14 & E15 Are Not Charging Problem

 

Laptop Model: Lenovo E14, E15

Laptop Board Number: NM-D011

Fault: Not charging

　　

 

Maintenance process:

    After disassembling the Laptop and unplugging the battery, the voltage at the common point of the single-plug power supply was 3.0 volts, and it kept jumping.

　　Looking forward, VINT20_IN also has no voltage, and continuing forward, this voltage is generated through the conversion of QB5 and QB6.

The front and rear voltages of QB5 are normal. The Gate of QB6 is normal, the Drain level is normal, the Source has no voltage, and the Mosfet has not broken down. I want to try another one first. When the air gun blew, the Mosfet flew away. I looked at the soldering pad and MOSFET and found that they were completely desoldered.

Decisively, the pads and Mosfet were plated with solder, the tubes were welded on, the plug-in current brushed up, and the power was turned on for a test. The charging sign came out, and the repair was completed.