Acer 4739z
PROBLEM:power on and switches off in 2seconds(BLUE LIGHT GLOWS FOR 2SECONDS AND OFF)
DIAGNOSIS:
1.VIN 19v ok
2.+3V_ALW AND +5V_ALW ok
3.PL14 COIL +3VPCU ok
4.PL13 COIL +5VPCU ---------------0V NOT OK IT SHOULD BE 5V
5.FOUND PQ11 MOSFET SHORT.REPLACED SAME MOSFET.SHORT REMOVED BUT SAME ...

good one........................
helpful sir