Solved How do you test laptop mobo with a Multimeter?

Acer Aspire as5315-2826-vhb notebook
April 17, 2013 at 14:38:29
Specs: windows 7, 2gb
I would like to know how to test the voltages on a laptop motherboard using a multimeter.
A friend of mine told me he uses the power socket as the earth for the the black probe and then the red probe is placed at the point on the mobo that you wish to test. Is that correct?
Any ideas?

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#1
April 17, 2013 at 16:28:13
✔ Best Answer
The negative terminal of the charging port may or may not be the preferred ground to use when measuring voltage. The circuit board may show the ground symbol or the etchings may indicate a large area of common voltage that might be the ground. If you have access to the board schematic it should show the ground.

Of course once you've determined the locations you need to know what the correct voltages there should be and, if they're not right, which component is defective. That will be the hard part.


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#2
April 17, 2013 at 19:02:55
Yes, you can use the shielding of the DC jack as ground. If you are troubleshooting a DC Jack then you will want to test for 19V at the mosfet transistors at the DC Jack. If you get voltage there, then it's not your DC Jack.

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#3
April 25, 2013 at 03:07:53
Thanks for replies.
I am still not absolutely sure and don't want to damage anything by placing the probes at the wrong points. You have given me some clues..

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#4
April 25, 2013 at 19:57:56
You're not likely to do any damage to the motherboard using a voltmeter. Well unless the probe touches more than one point at the same time thus causing a short. Voltmeter inputs have a very high impedence and don't interfere with a working circuit. Other multimeter functions such as ohmmeter, maybe a transistor or diode tester, are best used on a circuit that's not running. The ammeter function won't tell you much and you need to disconnect at least one side of the component in order to check the current flow. (There are the inductive-type ammeters but I don't think most small meters are equiped with those.)

DAVEINCAPS - Wandering aimlessly since All My Children was canceled.


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