Sorry for not respond, I was busy these days

I've been checking the motherboard and.. Yes, the 3V_SUS_ON goes high when I press the power button.

So, I decided to install the CPU, RAM and keyboard. Then I adjusted the power supply to 19.5V and 3A, when I turned on the power supply I saw the amps goes up and down, and the mosfet PQH8602 burned out.

Originally when I found this motherbord didnt have this mosfet, and I put in its place the AON7410 but I think that was not a good idea. I think i should put the PEA16BA (the original in this motherboard)....

The EC Pic ...

QUOTE=reformatt;n3291890]
Look closely for corrosion at these points, it can often be as simple as that. Corrosion often does some strange things on Asus boards.
[/QUOTE]

Thanx for respond.

Yes, the schematic shows that line as 3VSUS_ON.

Thats right, the +3VA_EC is present and 5VSUS_ON/5VSUS is present too, but 3VSUS/3VSUS_ON is not present.

The paths I peled (or scratched) near of the EC and measured the path in ohms from start to finish and its ok (the multimeter shows 0.1 ohm).

I have been loonking for corrosion but...

Here is the datasheets and some pics
...

Hello guys,

Well, I've acquired a broken laptop that I'm determined to fix it. I have experience repairing laptops, but I've never worked on one like this (ASUS Gl702ZC) which has a BGA-type KBC (EC/Super I/O) without pins.

I've been inspecting the motherboard and found a current draw of 0.035 A with 5V present, but theres no 3V regulated by the TPS51285A (I'll attach the datasheet).

I have the 3V and 5V Vregs, and I also have the EN corresponding to 5VA, but I dont have the PWM EN for 3VA.

(Curiously, the battery charging coil shows 19V.)...

try put the power on button, then press the power on button and insteanly remove the power on button from the conector.