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Old 10-15-2019, 11:28 AM   #1
mo000
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Default Samsung np350v no data .

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? .

Last edited by mo000; 10-15-2019 at 12:08 PM..
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Old 10-15-2019, 02:15 PM   #2
techtiger
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Default 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
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Old 10-16-2019, 03:19 PM   #3
mo000
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Default Re: Samsung np350v no data .

Quote:
Originally Posted by techtiger View Post
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? .
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Old 10-19-2019, 02:12 PM   #4
mo000
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Default Re: Samsung np350v no data .

any idea ?
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Old 10-19-2019, 02:49 PM   #5
digitalpc
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Default Re: Samsung np350v no data .

Quote:
Originally Posted by mo000 View Post
any idea ?
mabye track damaged
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Old 10-20-2019, 09:28 AM   #6
peste
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Default Re: Samsung np350v no data .

maybe bad soldering..
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