Lenovo rescuer y7000 battery does not charge and mechanical revolution x9ti does not show maintenance when starting

The Savior is the battery does not charge, the mechanical revolution is to use the charger and battery at the same time boot does not show.Dismantle the machine and directly find and disconnect the two resistors pin, find a 2m resistor on nm-c371 Parts motherboard, and a 133k resistor on apple Parts motherboard. Install the machine to test and repair the fault.

Machine model: y7000 of Lenovo rescuer and x9ti of mechanical revolution

Fault phenomenon: the rescuer is that the battery does not charge (once the charger is turned off), the mechanical revolution is that the charger and battery are turned on at the same time without display.

Maintenance process: school students came to the store to repair notebooks. One was the y7000 rescuer of nm-b701, and the other was the mechanical revolution with board number gkxcx7x 1.3.

Lenovo’s rescuer y7000 is that the battery does not charge (when the charger is turned off), the mechanical revolution is that the charger and battery are turned on at the same time without display. Although it is not the same computer, according to the past experience, we should first repair the mechanical revolution.

Lenovo rescuer y7000 battery does not charge and mechanical revolution x9ti boot does not show maintenance Figure 1

auto power off t possible to measure the voltage of the c1701.071 and the voltage divider of the VCC.077v CPU is not connected with the measured voltage of the c1701.077v CPU.

Remove the machine and directly find and disconnect the two resistors pin, measure diode value, which is a little smaller than normal value, and it is welded back to the original position, and it is powered on again. It should be the problem of these two resistors. We found a 2m resistor on nm-c371 Parts motherboard, and a 133k one on apple Parts motherboard. After installation test, the normal logo of mechanical revolution appeared and the fault was repaired.

Lenovo rescuer y7000 battery does not charge and mechanical revolution x9ti boot does not show maintenance Figure 2

Let’s take a look at the rescuer. After a measurement on the board and an oscilloscope, we found the battery in the machine, and also communicated with EC. We ordered a battery on the basis of Accessories first, and then we installed it. We thought it was a battery fault, so the customer came to take it. As a result, the customer tested it with a charger, but it still didn’t charge.

The old battery of the customer is still in use. It is said on the Internet that the limiting current of the pin pin is not correct and the partial voltage VCC is not correct. All the above resistors are replaced from C371 Parts motherboard, and the two MOSFET isolated by Current protection are replaced. After half an hour of test, they can be charged. It seems that Current protection isolation MOSFET has poor conduction, which leads to no charging and troubleshooting,This is the end of the repair.

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