sony svf14 HK8 no power

[pc.heidari]

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

[mayss]

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.

[pc.heidari]

Re: sony svf14 HK8 no power

i have done this but no power . still on power btn no voltage .

[mon2]

Re: sony svf14 HK8 no power

Remove D1 diode and test again.

[pc.heidari]

Re: sony svf14 HK8 no power

d1 not on board . empty

[mon2]

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.

[pc.heidari]

Re: sony svf14 HK8 no power

resistance nbswon# with gnd are 7.6 m/ohm .

[mon2]

Re: sony svf14 HK8 no power

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