asus n551j schematic

[Nikosz]

Hello,
i need asus n551 schematic pls.
Thanks

[Nikosz]

Re: asus n551j schematic

I have a asus n551 with shorting, first blowing one mosfet specifically pq8801 (P0903BEA ), i replace it, it goes bad as soon as i plug it in.
i remove the mosfet and no shorted with power adapter .
i need asus n551 schematic and any help to find a solution pls.
Thanks

[Duranitron]

Re: asus n551j schematic

I have a asus n551 with shorting, first blowing one mosfet specifically pq8801 (P0903BEA ), i replace it, it goes bad as soon as i plug it in.
i remove the mosfet and no shorted with power adapter .
i need asus n551 schematic and any help to find a solution pls.
Thanks

there must be a short somewhere in the board, i usually replace the control ic that is connected to the mosfet if the mosfet goes bad just a suggestion. hope this helps..

[Nikosz]

Re: asus n551j schematic

there must be a short somewhere in the board, i usually replace the control ic that is connected to the mosfet if the mosfet goes bad just a suggestion. hope this helps..

Thanks, i replace the IC control, i have tested it without ic control, but it stays short

[Duranitron]

Re: asus n551j schematic

Thanks, i replace the IC control, i have tested it without ic control, but it stays short

visual check where the mosfet is connected and try to clean it.. i have an experienced in board connectors that is ok when you check it without power but shorting out when you put power on it. specially boards that is thin or boards that was liquid spill damage. hope this helps..

[Duranitron]

Re: asus n551j schematic

did you check for short? placing negative prod of your tester to ground and poking the mosfet or parts around it with the positive prod. maybe there are still shorted mosfet around it. use binocular microscope if available or just a magnifying lens with strong light.. happy hunting!

[Nikosz]

Re: asus n551j schematic

i check for short circuit with Psu
and i find only the bga n16-gt-a2 to be heated.
Board view for asus n551j

[Duranitron]

Re: asus n551j schematic

is this mosfet that shorting out part of the supply for BGA ic that is heating up? there is something shorting it out when power is applied. visual check it again..try to look from the shorting mosfet connection..and what it supplies the power to. there is a shorted component else where hope its not the bga nvdia.. try again till you get it..

[on/off]

Re: asus n551j schematic

The Question how many volt when injecting?

Many people got mistake when injecting 19V rails with high volt, if one of High Side/ Upper Side fet shorted between Drain to Source, then directly voltage goes to COILS/OUPUT/LOAD side. (Maybe CPU, CHIPSET, RAM lines--- ~1V-1.5V)

[worm6666]

Re: asus n551j schematic

has somebody a board schematics ? I need to reveal the magnetic switch related to lcd - when lcd closed - the power on button doesn't work. need to overcome this behavior. thank You.