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Toshiba A55 laptop with no power

Hello folks. I am a newbie at using a multimeter - please forgive. This laptop will not power up at all. I have tried all the obvious things with no luck. Everything I have read leads to the power jack. I have the laptop taken apart - the jack is wired instead of directly connected to the motherboard.

Is this correct - there are 4 pins on the motherboard connector where this attaches. 2 of the 4 pins have what appear to be maybe slight oxidation? (the solder is yellow instead of silver). Do I check for continuity by simply touching each of the 4 pins with one needle than a ground point on the motherboard? And the meter should read '0' on each?

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  • jakkwbgcer Nov 03, 2008

    OK - you mean put a needle/tip on each yellow pin, right? When I do that, the meter goes from 1 down to 0.04 or .03 (my meter is digital). Should I check all four pins like this?



    Thank you.

  • jakkwbgcer Nov 03, 2008

    OK - you mean put a seperate needle/tip on each yellow pin, right?
    When I do that, the meter goes from 1 down to 0.04 or .03 (my meter is digital). Should I check all four pins like this?

    Thank you.

  • jakkwbgcer Nov 03, 2008

    "Yes, you are right. You need to touch each of the 4 pins one by one and the other on a ground point. The value should read 0. This way you can figure out the ppoint where you have the problem and get it repaired."



    When I do that, the two yellowed pins stay at zero. The other 2 pins read .03 or ,04 (is that close enough to zero?). So, the two yellowed pins need re-soldered?



  • jakkwbgcer Nov 03, 2008

    Sorry - I meant the two yellow pins stay at 1 instead of zero. Please forgive.

  • jakkwbgcer Nov 03, 2008

    OK, do I need to remove the old solder first, or just put more on it?

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Yes, you are right. You need to touch each of the 4 pins one by one and the other on a ground point. The value should read 0. This way you can figure out the ppoint where you have the problem and get it repaired.

Thanks

Posted on Nov 03, 2008

  • Indrajit Roy
    Indrajit Roy Nov 03, 2008

    Yes you need to put a seperate needle/tip on each yellow pin. You need to check all the pins this way.



    Click on this link http://en.wikipedia.org/wiki/Multimeter#...



    Thanks

  • Indrajit Roy
    Indrajit Roy Nov 03, 2008

















    If your multimeter reads 1, you guessed too low of a value. Move the dial to the next range up until you get a valid reading. If your multimeter reads at close to 0 (zero), you guessed too high of a value. Dial to the next range down until you get a valid reading; if you get to the lowest range and the value is still 0, whatever you're testing has zero resistance.

    Testing switches or relays is another common use of the resistance-testing feature of your multimeter. You can clip your test leads onto the lugs of an SPST switch to verify that it's working. (Hint: Occasionally, they don't work.) When the switch is open, you should get a value of 1, meaning that the resistance is higher than your meter can measure. When the switch is closed, you should get a low resistance — close to 0 (zero) ohms. You can also test SPDT or DPDT switches or relays to make sure which lugs are connected in which switch position.

    Measuring voltage
    To run a test to measure voltage, you connect the red multimeter lead to the positive side of the battery or circuit that you're testing and the black lead to the negative or ground side and set the dial to the voltage range you expect.

    Consider checking the voltage at the contacts of a battery pack. To do this, touch the red lead to one of the battery pack outputs and the black test lead to the other. With a 4-battery pack loaded with fresh batteries, you should get a reading of about 6 volts. (If you get a reading of -6 volts, don't worry: Just reverse which lead you are touching to which battery pack output.) When batteries get old, the voltage drops. If you get less than 5 volts from a 4-battery pack, it's time to get new batteries.

    When a circuit doesn't work, one of the first things to check is the voltage between the +V bus and the ground bus of the breadboard. Here's how:

    1. Strip both ends of a 3" piece of 22 gauge wire.

    2. Clip one end of each wire to one of your test leads.

    3. Slip the free end of the wire attached to your red test lead into any contact on the +V bus.

    4. Slip the free end of the wire attached to your black test lead into any contact on the ground bus.

    Although you might not get a reading of the full 6 volts because of drain on the battery from the circuit, you should get a reading above 3.5 volts.

    If you get a reading close to 0 (zero) volts, check to make sure that your battery pack and the wires from the battery pack terminal block are connected properly.





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Set the multimeter to Ohm meter / resistance meter. Then place the pin not on the ground but on both wires with yellow solder. If the tester's pin did not move, it means no connection. Resoldering those points will fix it. Do the test again.

Posted on Nov 03, 2008

  • Michael Galve
    Michael Galve Nov 03, 2008

    Yeah, 1 needle stays on 1 point and just move the other needle touching all 3 other pins and look which one has the zero reading. The one with zero reading has the cold solder or open wire. Resolder it and do the meter test.

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