Asus FL5900U notebook does not trigger the repair of non-boot

Asus FL5900U laptop does not trigger not turn on, plug in and try the current 0.010A does not trigger, directly find K42J material board to remove one over, replace the resistance, and so the board is cold, plug the current directly run up the light machine.

[Machine Model] Asus FL5900U notebook

[Motherboard version number] X556UV

[Fault phenomenon] laptop does not trigger not boot

[Repair process].

Received a peer ASUS FL5900U fault machine, the motherboard version number X556UV, plugged in to try the current 0.010A does not trigger.

Asus FL5900U laptop does not trigger or power on repair Figure 1
Disassembly, bare board by the switch again test Still. Since the standby has 0.010A did not measure the resistance value, directly hit the major inductor voltage, turned around only 3.3V and 5V, a newer board seems to be missing all the way to standby 1V, the next point map, open the point to view.

Asus FL5900U notebook does not trigger the repair of non-boot Figure 2
Here resistance value of more than 100 no to ground, find the chip PU8302 check 11 feet of power supply 5V, 8 feet on signal 0V no, all the way to run lines directly on the map.

Asus FL5900U laptop does not trigger and does not turn on repair Figure 3

华硕FL5900U笔记本不触发不开机维修图4

Asus FL5900U laptop does not trigger and does not turn on repair Figure 4

华硕FL5900U笔记本不触发不开机维修图5

ASUS FL5900U laptop does not trigger and does not turn on repair Figure 5

华硕FL5900U笔记本不触发不开机维修图6

ASUS FL5900U laptop does not trigger and does not turn on repair Figure 6

华硕FL5900U笔记本不触发不开机维修图7

Asus FL5900U laptop does not trigger and does not turn on repair Figure 7

PR8333 – and then to PR8318, found that PR8318 one end +3VSUS only 1.1V, conversion did not come from the chip PU8803, check on the signal PR8819 only 0.6V at both ends, the other end is VSUS_ON, and then run the line to the EC next to the resistance RN3010, look at the board is a 104 row resistance 10K VSUS_ON, the other side of 3.3V normal, directly find K42J material board to remove one over, replace the resistance, and so the board is cold, plug the current directly run up the light machine. Troubleshooting, repair to this end.