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needing suggestions for determining if a laptop motherboard is receiving current

Hi Everyone;

         I have a laptop disassembled and wish to determine if the motherboard is receiving current.  Prior to disassembly, the laptop was not powering up at all.  And, prior to that, it would only power up and stay powered on if the AC adapter chord is held up.  Based upon these symptoms, I replaced the DC recharge port.  The AC adapter is working fine and outputing the correct DC voltage as determined by my digital multimeter.  If possible, I would like to use this new digital multimeter to determine if the laptop motherboard is receiving current following the DC recharge port replacement.

           In closing, any help regarding this question will be greatly appreciated.  I will look forward to hearing back from everyone.

           Thanks so much.

           George
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GMartin
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GMartin
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3 Solutions
 
greg_vanderCommented:
just test the motherboard with the multimeter : start near the ac connector. ther are a lot of cases where the solder is broken at the connector .
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GMartinAuthor Commented:
Hi Greg
          Thank you for you reply.  If it would not be too  much trouble, could you send  a link illustrating the steps?  I am just not sure of the exact points on the motherboard to carry out the testing.  A multimedia link would be most preferred, but, any link with diagrams will work just fine as well.
     
           Thanks

           George
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nobusCommented:
George, what model laptop is it?
or post a picture, then we can look for specific info
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GMartinAuthor Commented:
Hi

        My apologies.... The laptop is an Acer Aspire 3690.   If you should need more information, please feel free to let me know.  I will be monitoring this post throughout the weekend.

         Many thanks once again for everyone's willingness to assist me with this question.

         George
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nobusCommented:
george, i could not find a manual conataining motherboard picture  - can you post one?
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GMartinAuthor Commented:
Hi

          Unfortunately, I have a friend of mine who has it at this weekend.  He is helping me with the removal of the DC recharge port.  At any rate, once I get it back, I will take a pic and upload it.

          Thank you.

          George
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nobusCommented:
you can measure at the supply connectors for disk drive, cd and other cards if 5V is there
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GMartinAuthor Commented:
Hi There;

         Great suggestion Nobus!!!  I should had thought of that, but, I didn't.  If possible, could you give me an example or illustration on how to test these connectors to determine if 5V is there?

         Thank you.

         George
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nobusCommented:
well - you have to look what device it is and look for the power connections to it - here an example for sta devices :  http://en.wikipedia.org/wiki/Serial_ATA#Standard_connector
for ide drives 43 and 42 = oV, 41 = + 5V

that should get you going
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GMartinAuthor Commented:
Hi Everyone;

         Thanks for the information and links given.  While everything given does make sense, I believe I need to get more experience with testing using a digital multimeter.  Only then will everything really come together.

          Thanks again for the information.

          George
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nobusCommented:
george, FYI here is some of my "experience" :
i have a couple of very flexible wires 10-20 cm long, with a small alligator clip at each end in different colors.
so i connect say the black wire to the black VOM lead, and the red to the red VOM lead.
now i take a couple of needle pins in both alligator clips, which i can use to contact inside tiny plugs, or even perforate wire insulation to measure at the wire, without cutting it -  or just clip them on a ground contact somewhere...
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