Acer ES1-411 notebook is not turn on for repair

Model: Acer ES1-411

Malfunction: Notebook no booting

Maintenance process: when DC power supply is connected, the standby current is 0.001, and when Switch is pressed, the current is 0.059. It seems that it is not powered on, so the motherboard is removed.

Acer ES1-411 notebook is not turn on for repair Figure 1.

There are 3.3V and 1.8V (standby for CPU) for standby time measurement, but there is no 5V. Turn off the power supply and call 5V diode value as 0. After reading schematic,5V goes to several power chips. The result of Current heating test solution can’t be burned out. The filter Capacitor at the end of 5V Inductor was removed.

Acer ES1-411 notebook is not turn on for repair Figure 2.

After Capacitor was removed,diode value returned to normal. When Switch 5V was pressed, only 1.4V came out, and the chip was probably broken. Change it on the next day after purchase, and 5V came out perfectly.