Lenovo Y7000P laptop boot auto power off repair

Machine model: Lenovo Y7000P

Plate No.: nm b962 R1zero

Fault phenomenon: start auto power off, sometimes the logo will light up

Maintenance process: there is no drawing for this machine. You can refer to the drawing point of c221 (Xinzhizao Soft). The current of 1.2A or so drops to 0.023, and switch and 0.023 are not very high, but my intuition tells me that the standby time is a little bit high, so I can’t say it.

Lenovo y7000P laptop boot auto power off repair Figure 1.

Remove the motherboard bare board boot phenomenon, brush a BIOS fruitless, eliminate peripheral and BIOS problems.Take out the artifact thermal imaging in standby without switch, the network card chip actually has nearly 40 degrees, which is definitely abnormal.

It’s really good to dismantle it, and the standby is changed from 0.023 to 0.009, but the same wired network can’t be used. In pursuit of perfection, I found the same 8111H and replaced it.

Lenovo Y7000P notebook boot auto power off repair Figure 2.

Lenovo Y7000P notebook boot auto power off repair Figure 3.

I thought it was a spike, but the result was the same as before. This time, the LOGO dropped when the screen was not lit, and I found another chip to replace it, which basically ruled out the problem of the chip itself.

After checking the peripheral circuits,Measuring diode value measured VCC, removed VCC filter Capacitor, and removed anti-static. See the definition of pin in the chip data manual (a group of lighting cable is either an interface or a south bridge. Can lighting cable also lead to auto power off? ).

Lenovo Y7000P notebook boot auto power off repair Figure 4.

Everything that was removed was restored, except that the network card chip was not installed. After communicating with the customer, you can buy a USB external connection, as shown in booting up.