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Old 12-26-2021, 04:40 AM   #1
pc.heidari
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Default sony svf14 HK8 no power

hi . i have a sony svf14 da0hk8mb6e0 rev e .
no power
main have 3.3 and 5 pcu . bios pin 8 have 3.3 .
kbc chipset have 3.3 pcu and other .
but on pwrbtn (nbswon ) are 0.3 v
on kbc pwrbtn out ok
lid sw ok
rsmrst ok .
bios check
why no any voltage on power btn ? laptop dont power
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File Type: rar HK8 brd.rar (88.1 KB, 7 views)
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Old 12-26-2021, 07:35 AM   #2
mayss
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Default Re: sony svf14 HK8 no power

Make a short circuit of the KBC leg 15 (EC_PWRBTN #) to ground and see if the motherboard starts.
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Old 12-26-2021, 09:03 AM   #3
pc.heidari
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Default Re: sony svf14 HK8 no power

i have done this but no power . still on power btn no voltage .
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Old 12-26-2021, 09:23 AM   #4
mon2
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Default Re: sony svf14 HK8 no power

Remove D1 diode and test again.
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Old 12-28-2021, 04:12 AM   #5
pc.heidari
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Default Re: sony svf14 HK8 no power

d1 not on board . empty
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Old 12-28-2021, 07:52 AM   #6
mon2
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Default Re: sony svf14 HK8 no power

What is the resistance to ground for NBSWON# on the switch ? Red meter probe on NBSWON# and black meter probe to ground.

Confirm with the meter, that the switch is working. When you close the on/off switch, does the meter show close to 0 ohms ? I am assuming that the ON/OFF function is a simple mechanical switch for this design. Not sure if there is a logic board with the on/off switch.
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Old 12-30-2021, 03:53 AM   #7
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Default Re: sony svf14 HK8 no power

resistance nbswon# with gnd are 7.6 m/ohm .
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Old 12-30-2021, 07:20 AM   #8
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Default Re: sony svf14 HK8 no power

What is the resistance when you press the on/off button ?
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