Laptop Power Checking process (Step 2)

1) Check (19v/Battery) on LDO IC Pin.
2) Check LDO Enable Signal(some time auto generated but            some time this signal have a Circut).
3) Check 3v/5v ALW supply on LDO IC pin.
4) Then Check 3v/5v Run Power Supply on Switching Mosfet..

(Note: If This Step is Ok then Go Step 3)

www.thetechnicaljunction.com