ASUS u31sd LAPTOP WILL NOT TURN ON

[opamp]

Re: ASUS u31sd LAPTOP WILL NOT TURN ON

I found how to read this board look at the picture where I marked, see how one is PJ8800 and the other one is PJ8801? that's how you follow the voltage. You need to take a picture of the full board (both sides of course) and mark each one until the counting stops, you know PJ8802, PJ8803 and so on.

[opamp]

Re: ASUS u31sd LAPTOP WILL NOT TURN ON

Also ask the guy of the schematics for a refund or to get you the right schematic.

[opamp]

Re: ASUS u31sd LAPTOP WILL NOT TURN ON

Remove the WIFI card before you take the pictures.

[CR Designs]

Re: ASUS u31sd LAPTOP WILL NOT TURN ON

I found how to read this board look at the picture where I marked, see how one is PJ8800 and the other one is PJ8801? that's how you follow the voltage. You need to take a picture of the full board (both sides of course) and mark each one until the counting stops, you know PJ8802, PJ8803 and so on.

are you suppose to be checking voltage at these points
Here's some more pictures of the MB

[CR Designs]

Re: ASUS u31sd LAPTOP WILL NOT TURN ON

Remove the WIFI card before you take the pictures.

Here's a picture with the wireless card removed. I think the ic you guys were looking for was under the wireless card

[heavymachines]

Re: ASUS u31sd LAPTOP WILL NOT TURN ON

Here are the pictures,circled ones reading bad

those are smd capacitors...polarized along with the ones that look like mini coke cans....

polarized means it has negative and positive polarity.
non polarized capacitors means there is no polarity.. you can put then in any way you like and won't hurt anything...polarized capacitors can only go in one way because of negative and positive polarity....


there are different packages they come in and a wide range of them too... and different materials there made with...

[heavymachines]

Re: ASUS u31sd LAPTOP WILL NOT TURN ON

Here's a picture with the wireless card removed. I think the ic you guys were looking for was under the wireless card

there is a good reason i said to remove heat sink and ribbon and tape etc and that's why.... before you take pictures...

[heavymachines]

Re: ASUS u31sd LAPTOP WILL NOT TURN ON

Also ask the guy of the schematics for a refund or to get you the right schematic.

i agree

[CR Designs]

Re: ASUS u31sd LAPTOP WILL NOT TURN ON

lets check all your diodes, set your dmm to diode, put neg and positive probe on each side of smd package and it should get reading one way and 0 the other way when probe is switched....



if you get reading both ways you will need to desoldier it and retest on the table however remember to keep track of the markings and make absolute sure you put it back the same direction it came off .... mark where the line is so you don't put it back on backwards....

diodes let voltage go one way and not back the other way very much like a one way valve for water pump in your house....

here is a picture of what they look like and different packages they can come in and not to be mistaken for smd capacitors sometimes they kinda look like each other ....take a picture or the ones you already have and mark each one you tested so we can make sure your not testing the wrong thing.....

On post 167# you said check diodes , I assumed those were diodes by the pictures you posted. can you send pictures of what they look like on this MB or circle a thew on the pictures of MB already posted... Thanks I know what the larger ones on TV look like. this laptop stuff is all new

[heavymachines]

Re: ASUS u31sd LAPTOP WILL NOT TURN ON

those are smd capacitors...polarized along with the ones that look like mini coke cans....

polarized means it has negative and positive polarity.
non polarized capacitors means there is no polarity.. you can put then in any way you like and won't hurt anything...polarized capacitors can only go in one way because of negative and positive polarity....


there are different packages they come in and a wide range of them too... and different materials there made with...

and polarized capacitor are always marked with a white stripe or negative symbol to signify polarity....

[heavymachines]

Re: ASUS u31sd LAPTOP WILL NOT TURN ON

On post 167# you said check diodes , I assumed those were diodes by the pictures you posted. can you send pictures of what they look like on this MB or circle a thew on the pictures of MB already posted... Thanks I know what the larger ones on TV look like. this laptop stuff is all new

there is a difference they look close i suppose but the legs and form factor is different....

[CR Designs]

Re: ASUS u31sd LAPTOP WILL NOT TURN ON

are you suppose to be checking voltage at these points
Here's some more pictures of the MB

What do I do when the numbers stop?

[opamp]

Re: ASUS u31sd LAPTOP WILL NOT TURN ON

Here's a picture with the wireless card removed. I think the ic you guys were looking for was under the wireless card

Post the numbers on this IC and see if it has 3.3v. Start with the pins on the corners some should have always on voltage(3.3v).

[opamp]

Re: ASUS u31sd LAPTOP WILL NOT TURN ON

What do I do when the numbers stop?

Mark them on a picture so we can get an idea how the voltage is distributed, you see these are multiple layered boards. That means if one part is next to the dc jack the following part could be on the opposite side of the board on the opposite corner , do you get the picture? you never know that's why a schematic is real important for these boards.

[CR Designs]

Re: ASUS u31sd LAPTOP WILL NOT TURN ON

Post the numbers on this IC and see if it has 3.3v. Start with the pins on the corners some should have always on voltage(3.3v).

iTE
IT8572E
1123-AXA
DCEAOB

Do I put CPU and heat sink back on to check ic ?

[CR Designs]

Re: ASUS u31sd LAPTOP WILL NOT TURN ON

What about the diode check. need to know what to look for.

[opamp]

Re: ASUS u31sd LAPTOP WILL NOT TURN ON

No just don't power it up.

[opamp]

Re: ASUS u31sd LAPTOP WILL NOT TURN ON

What about the diode check. need to know what to look for.

I have marked a couple of diodes check the picture.

[CR Designs]

Re: ASUS u31sd LAPTOP WILL NOT TURN ON

I have marked a couple of diodes check the picture.

WOW those are small, about how many will be on MB ?

[CR Designs]

Re: ASUS u31sd LAPTOP WILL NOT TURN ON

What should my meter settings be set for the ic?