lenovo g 570 not power on

[javed]

model lenovo 570
boar num la-75ap
problem no power on ..
check. no voltage on dc jack ..with adapter i check charger ist ok that means..
board is short ... i check in dc supply..board 19v shorting
check volt in mosfte . one is short pq 32 is short change put supply but dc show more shorting .
fined pq 310 is also short .. change and check .... now sys is fine....