Lenovo notebook 320-15ISK boot does not trigger fault repair

3V standby, replaced by an AMS1117-3.3, suspected that there is something wrong with the graphics card chip, turned off the power, removed the power supply inductor of the graphics card, and powered on again. The machine runs normally, the fault is repaired, and the maintenance is over.

Machine model: Lenovo Lenovo notebook 320 15ISK

Fault phenomenon: the notebook does not trigger when it is turned on.

Maintenance process:

Disassembled and inspected, it was found that the 3V circuit burned the pads, and I don’t know if there were any other circuits damaged behind it.

Lenovo notebook 320-15ISK startup does not trigger fault maintenance Figure 1

The picture below shows the original 3V circuit. Without the original chip, the customer is in a hurry and can only repair it urgently.

Lenovo notebook 320-15ISK does not trigger a fault. Figure 2

3V standby, replaced by an AMS1117-3.3.

Lenovo notebook 320-15ISK does not trigger a fault. Figure 3

After checking that there are no errors, turn on the power, measure all the voltages, and the current will rise all the way. If the power is off, the screen and other accessories can be turned on and displayed. I think it is good. Turn off the hard disk, and restart it on the blue screen when the boot is near the desktop.

Turn it off again, and replace the hard disk of the tester with the system. As long as the discrete graphics card is not driven, the machine is all right. After driving the discrete graphics card, it is the same as the failure of the original hard disk. If you fast forward, the system will report a blue screen error. Suspect that there is something wrong with the graphics card chip, turn off the power, remove the power supply inductor of the graphics card, turn on the power again, the machine runs normally, the fault is repaired, and the maintenance is over.