Asus x751ld rev 2.0 mosfet problem

[NConstantinou]

Dear all
i have the above m/b and i am facing a problem with 2 short mosfets P2003BEA.

can i substitute with any N channel mosfet that has Vds 30v, Vgs 20v and Id=10A.
P2003 BEA states 20mOHMS Vgs10v!

Thanks

[NConstantinou]

Re: Asus x751ld rev 2.0 mosfet problem

IF I SUBST. WITH ap9402 WHICH IS
Vds 30v
Rds 18Mohms
Id 20.6A
Vgs 20v

or
M3002 mosfet
would that be ok!

[piernov]

Re: Asus x751ld rev 2.0 mosfet problem

https://logi.wiki/index.php/User:Pie...iginal_part.3F

[NConstantinou]

Re: Asus x751ld rev 2.0 mosfet problem

Thanks for the reply,

Finally I have changed the mosfet with 7410.
On ic up1589 vin is ok, enable 3.3 and 5v is ok, entrip1,2 are ok, enldo is ok but there are no outputs on coils for 3.3 and 5v. On pins 7 I have 0v and on pin 19 0.1v
I checked with multimeter in diode mode these 2 pins and look ok.
I checked for short, no short.
On switch button I have 3.3v but not on pin 8 of bios.
Do you have any suggestions.

Thanks

[mcplslg123]

Re: Asus x751ld rev 2.0 mosfet problem

Check Feedback resistors and powergood.

[NConstantinou]

Re: Asus x751ld rev 2.0 mosfet problem

ok i will check resistors.
i would like to point out something.
i have changed 1589 ic.
at all times pin 20 it shown short except once.
i unsolder the ic and trace were not short nor when the the ic was install pins were touching to each other. that happen with different ic's.
i will trace that also

thanks
i will come back to you

[NConstantinou]

Asus x751ld rev 2.0 dual mosfet 6 pin

I have the above m/b which does not have 3.3 and 5v supplies.
Ic step down regulator seems to work ok. i have Vin, LDO3.3 and 5v,EnLDO 6v,
Entrip1,2 ok.
there is one dual mosfet 6 pins (very small) label NT which is getting very HOT. Is located near the RT8239B.
testing pins 1 and 6 seems ok and 3 and 4 are ok is diode mode.
does anyone knows what is the function of that 6 pin mosfet!
does that preventing 3.3 and 5v to power up!

Thanks
Note: no short is shown on any coils.

[SMDFlea]

Re: Asus x751ld rev 2.0 dual mosfet 6 pin

This might be the one with NT marking ,https://www.badcaps.net/forum/showpo...14&postcount=9

The boardview will show you what its connected to https://www.badcaps.net/forum/showthread.php?t=89785

.

[NConstantinou]

Re: Asus x751ld rev 2.0 mosfet problem

Ok. After investigation of m/b I found that 3
+3vEC and 3v vcc are shorted near the EC IC.
The EC ic is ite8585e.
Does this mean that IO is burned!
Thanks