Troubleshooting of Lenovo rescuer Y9000X 2020 notebook when it is not turned on

Troubleshooting of Lenovo rescuer Y9000X 2020 notebook when it is not turned on.

Brush BIOS first, and buy pure ME BIOS, but the programmer does not support QH128AHIG, and it is successful to switch to 25L12873F. The sound of the boot test is also normal. The fault is perfectly repaired.

Machine model: Lenovo Y9000X 2020

Main board number: LA-J061P

Fault phenomenon: the notebook does not turn on, pressing the power button has no response, and the discharge is invalid.

Maintenance process:

It is found that 3.3V stands by, the inductance is 19 to the ground, 1.05V to the ground is 0, and the others are normal. Connected to the 1.05V induction burner, there is only 200 mA current, and no short circuit point can be found.

Without drawings, according to experience, these two sets of voltages reach the South Bridge at the same time. The south bridge SR40B is made of black glue, and only a few empty spots are removed. Then measure the normal grounding of each inductor, weld the new south bridge, measure the normal grounding value, and install the test.

The test found that the boot was slow, and it took 20 seconds to display, which was generally caused by ME mismatch after changing the south bridge. Intel Zhiyin makes an exclamation point, and there is no sound output, and so is the reloading system. Plug-in power prompt slow charger, mine is 65W, which may be power mismatch. The customer changed the case and didn’t know how much the original power was. Upon inquiry, it is 95w, so we have to wait for the customer to bring the original power supply for testing.