Lenovo rescuer Y7000P turned on and turned off (lack of single display power supply)

Lenovo rescuer Y7000P turned on and turned off (lack of single display power supply)

Lenovo rescuer Y7000P, power on and power off after triggering. Generally, when you get a computer, first disassemble the motherboard, and then measure the major inductance resistance of the motherboard to see if there is any unreasonable place for maintenance. Let’s take a look at the detailed explanation below for the specific operation!

[Fault model] Lenovo rescuer Y7000P

【 Fault Phenomenon 】 Power failure during startup

[Maintenance process] I received a machine sent by a customer for repair, the model is Lenovo rescuer Y7000P, and the fault is characterized by power-on and power-off after triggering.

Lenovo rescuer Y7000P power-on and power-off Figure 1

After taking the motherboard, remove it. First, measure the resistance values of the major inductors on the motherboard. If there is no obvious short circuit, then we can turn on the power to see the current, which can be triggered normally. When it is more than one year, it will automatically power off later. After measuring the voltage, we find that most of the voltage comes out, but the power supply of the single display does not come out. Check it out.blueprint, it is found that there is no centralized display power supply +1.8VS_VGA. Look for the drawings to generate this QV5 and QV10.

Lenovo rescuer Y7000P power-on and power-off Figure 2

When measuring the resistance nearby, it is found that the resistance at one end of RV17 is OL, which is obviously abnormal. This path should be from a common point to generate partial pressure, and the distance between the upper end of RV17 and the common point is infinite.

Lenovo rescuer Y7000P power-on and power-off Figure 3

It should be disconnected. We directly pull the wire from the common point, and then test that the resistance is not short-circuited, and then directly power on. The startup current jumps normally, and the voltage of +1.8VS_VGA is also generated normally. The test can enter the system normally.

Lenovo rescuer Y7000P power-on and power-off Figure 4

[Maintenance result] The mainboard was installed, and the startup test was successfully lit. The recording, camera, sound and WiFi of the system test were normal, and the stress test of the baking machine was normal for half an hour. The maintenance was over.