Motherboard doesn't receive power

[paul1149]

I have an acer d250 netbook that was working fine, but it is possible the previous owner dropped it while the lid was open, because the hinges had broken loose.

So I decided to move the guts over to a good case. Should be simple, I thought, but on testing the newly assembled unit the MB was dead. Further testing showed only a weak pulse at the MB power block, of about 2 volts every 2 seconds, whereas there should be some 19 continuous volts coming in. The male power plug when unplugged from the MB registered full voltage.

Is this a throwaway or is there some relatively easy fix? My soldering skill is limited.

Thanks.

 

[jarotech]

When you said you have a netbook "that was working fine", it was working before you "move the guts over a good case" is that what happens. If so you have a short-circuit on the motherboard.

 

[paul1149]

A short circuit would make sense, and probably would be impossible for me to track down.

 

[jarotech]

What you could do is to take out the motherboard from the case and plug the screen and power supply and see if it still working.

 

[paul1149]

I've done all that.

 

[jarotech]

You have the KAV60, let me see the schematic for an answer.
may take a while.

 

[jarotech]

It could be also the ac adapter, without a charge it will show around 19v but with a charge it will drop. Check with another one if you have one around.

 

[paul1149]

Did that too, and both are known good.