Samsung np350v no data .

[mo000]

hi
Samsung np350v QCLA4 LA-8861P ,REV 2.0
the laptop power up with led on and off nothing else .
I found 3.3v and 5v
but no voltage on bios

vcc bios comes from +3VS
i track +3vs on the schematic


no +vsb on gate of q29 q30

i track the +vsb



here i can't find PQ1 AND PQ2 on motherboard .

any help? .

[Techtiger]

Re: Samsung np350v no data .

try to find out PJP3 jumper its +19V when that voltage comes to R409 R410 but it will NOT cross untill SUSP hit's Q10 Q11 after Q30 Q29 gate voltage will be +15V to DC to DC convert

[mo000]

Re: Samsung np350v no data .

try to find out PJP3 jumper its +19V when that voltage comes to R409 R410 but it will NOT cross untill SUSP hit's Q10 Q11 after Q30 Q29 gate voltage will be +15V to DC to DC convert

finally i found the pjp 3 and pq1 and pq2 next cmos battery
but amazing something was happen
first no voltage on pjp3
PQ1 D=0 g=19v s=19v this mosphet should works and get the +VSBP after the voltage appears at the gate ; this voltag comes from pq2
but after i check the pq2 by the multimeter the voltag appears on pjp3 and the laptop works and show data on the screen

i don't know exactly what happen
can someone explain that? .

[mo000]

Re: Samsung np350v no data .

any idea ?

[digitalpc]

Re: Samsung np350v no data .

any idea ?

mabye track damaged

[peste]

Re: Samsung np350v no data .

maybe bad soldering..