Vaio SVF15N - DA0FI3MB8E0 - DEAD

[CornholioGSM]

Hello

soo i need my first help.
By me is vaio SVF15N1C5E from my friend.
It was repaired one month ago - fet PQ27 was blown. So i have changed it. Original was AON7400A
Laptop works without problem so i have returned it to friend.
But my friend use not original charger and this is problem because laptop was returned back and again PQ27 smashed. So i have changed it again, test to find short on mainboard with no short result.
Problem is , that now is mainboard fully dead and no charging.

I have not found scheme for exactly this laptop, but i have found scheme for smaller version and it looks approx same.
Can anyone please look into scheme for check where can be problem?

thx

[caspian]

Re: Vaio SVF15N - DA0FI3MB8E0 - DEAD

trace the 19v rail on the mainboard to discover where it is not present.

[CornholioGSM]

Re: Vaio SVF15N - DA0FI3MB8E0 - DEAD

i have found, that i dont have nothing on VA. I can measure on PQ35 19V on pins 1-3 and 4...but nothing on 5-8.
Testd with another P-mosfet but nothing

[tibd]

Re: Vaio SVF15N - DA0FI3MB8E0 - DEAD

According to supplied schem pq35 is a 6 pin dual transistor, are u sure u ment that chip or is it pq34 u mean. Missing VA, then check the VAOFF Circuit.

[CornholioGSM]

Re: Vaio SVF15N - DA0FI3MB8E0 - DEAD

sorry sorry sorry....i am stupid idiot. i mean PQ34 - TPCA8109 - Pfet

oki - i will check VAOFF