ASUS fx86f notebook cannot be started for repair

Machine model: ASUS fx86f / fx505gd

Fault phenomenon: notebook Won’t Turn On

Maintenance process:

A ASUS fx86f notebook computer, the fault is the notebook Won’t Turn On, take out the main board to measure, the current is 0.02-0.04, repeated current of change, except that the linear 3 / 5V is normal, the common point is normal, the others are all jumping, namely automatic switch-Current protection-automatic switch-Current protection.

In this case, the damage of c9404 is common failing, and the measurement is normal.

ASUS fx86f notebook cannot be started for repair Figure1.

Open Xinzhizao Soft to find schematic, and measure that there is no Short circuit in Inductor,Switch, Hall element and all kinds of Capacitor.All kinds of pwrgd were normal.

ASUS fx86f notebook cannot be started for repair Figure2.
Disconnect PM_Rsmrst ා does not trip, but can not determine the fault, then disconnect PM_The current does not jump when susb / C ා.

ASUS fx86f notebook cannot be started for repair Figure 3.
Check PM_VCC opened by susb.

ASUS fx86f notebook cannot be started for repair Figure 4.
It was found that VCC in vccio group was abnormal.

ASUS fx86f notebook cannot be started for repair Figure 5.
Other Inductor have VCC current of change, but there is no current of change in this Inductor above.This chip is MOSFET integrated, after removing it, power on to 0.15 does not jump, after repeated confirmation is apw8715 chip problem.Replace the chip, power on test,Normally booting up, troubleshooting, maintenance is over.