Need schematic or boardview for Asus K55VD Rev:3.1

[kiyanmz]

Hello.
The problem is that my laptop power voltage of 19 volts gone 4-6 but changing and swing .
However, when a few minutes plugin adaptor, gate voltage of entrance MOSFETs come back and laptop would switch.
I can not fault anything and I follow the path .
I thank you for your tips .
Thanks.