Lenovo Xiaoxin air13iwl notebook standby Short circuit maintenance

Lenovo Xiaoxin air13iwl notebook standby Short circuit maintenance

[machine model] Lenovo Xiaoxin air13iwl

[mainboard version] la-g651p 1.0

Short circuit

[maintenance process]

Received a Lenovo small new air13iwl fault machine, plug in the power supply for a while there is VCC, not VCC.I didn’t find any burning places or moving things.

Lenovo Xiaoxin air13iwl notebook standby Short circuit maintenance Figure 1

Lenovo Xiaoxin air13iwl notebook standby Short circuit maintenance Figure 2

The motherboard was removed from Current heating test. At the beginning, pr303 resistor was connected to one end, and 1V Current heating test current was 1.25. It seems that Short circuit is behind.

Lenovo Xiaoxin air13iwl notebook standby Short circuit maintenance Figure 3

But I can’t figure out where high temperature is. When the current is adjusted to 2V, the current is more than 4a. Under a sticker, there is an Capacitor next to the standby chip pu701, which is directly removed.

Lenovo Xiaoxin air13iwl notebook standby Short circuit maintenance Figure 4

Lenovo Xiaoxin air13iwl notebook standby Short circuit maintenance Figure 5

So this is about the drawing problem: the drawings of version 1.0 and version 0.2 are exactly the same, and the comparison of each hardware component is the same, so there is no need to tangle with the schematic version.
There is also BIOS is not universal, 1.0 version of BIOS and 0.2 version of BIOS is not universal, specially try.Bios1.0 version should correspond to a sticker to brush, do not brush without brain, otherwise it will not be used [read by the programmer used by BIOS].

Lenovo Xiaoxin air13iwl notebook standby Short circuit maintenance Figure 6
Start up test,Normally booting up.Video card driver and fan are all normal. Troubleshooting and maintenance are over.

Lenovo Xiaoxin air13iwl notebook standby Short circuit maintenance Figure 7