Asus X512DK

[Luís Amaral]

Hello guys, i'm working on a Asus X512 DK that arrive with DC IN problems, charger only had 3v on VCC, solved that part, but now i only have 2.7v on power button, i can´t find shematics, but i think the probem is the gates on VS lines are too low...

I post a photo with the voltages, anyone could help will be appreciate !

[mon2]

Re: Asus X512DK

Remove all power.

Meter in resistance mode (2k scale).

Check the resistance to ground of the rail that is 2v7.

Post your readings.

[Luís Amaral]

Re: Asus X512DK

Remove all power.

Meter in resistance mode (2k scale).

Check the resistance to ground of the rail that is 2v7.

Post your readings.

25K Ohms

[mon2]

Re: Asus X512DK

Resistance is good.

Trace the rail back to the nearby mosfet and post the markings or a clear picture (preferred).

Remove all power. Meter in resistance mode (2k scale).

Measure the resistance for the mosfet to check if it is damaged:

source & drain
source & gate
gate & drain

Post the readings.

[Luís Amaral]

Re: Asus X512DK

Resistance is good.

Trace the rail back to the nearby mosfet and post the markings or a clear picture (preferred).

Remove all power. Meter in resistance mode (2k scale).

Measure the resistance for the mosfet to check if it is damaged:

source & drain
source & gate
gate & drain

Post the readings.

Already replaced the mosfets, and tested them, they are good !

[Luís Amaral]

Re: Asus X512DK

Already replaced the mosfets, and tested them, they are good !

Replaced also PWM

[reformatt]

Re: Asus X512DK

I've had some issues with this motherboard with corrosion at the top RHS corner near the LCD connector. The area is covered by a piece of foam to deflect air into the lappie. There are some decoupling capacitors under it for the +5V rail which go short. BTW, the two big coils on the extreme RHS are +5V and +3.3V respectively from top down. This is the 2nd time I've had to replace the caps in this area for this customers lappie. Lives near the ocean so air is moist.

I just replaced the cap in question with a 0.1uf as a guess. Seems to work ok. Sorry for the blurriness.

[Luís Amaral]

Re: Asus X512DK

I've had some issues with this motherboard with corrosion at the top RHS corner near the LCD connector. The area is covered by a piece of foam to deflect air into the lappie. There are some decoupling capacitors under it for the +5V rail which go short. BTW, the two big coils on the extreme RHS are +5V and +3.3V respectively from top down. This is the 2nd time I've had to replace the caps in this area for this customers lappie. Lives near the ocean so air is moist.

I just replaced the cap in question with a 0.1uf as a guess. Seems to work ok. Sorry for the blurriness.

Thanks for the info, this one i could not repair it

[reformatt]

Re: Asus X512DK

Just a heads up to check under that foam block near the LCD connector if you get one of these in dead. Easy to overlook.