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Reply to Sparks coming out of the DC pin when battery was getting low

Thanks for getting back. Since I wrote my question I learned that the DC pin or where I plug in the electrical cord is part of the mother board. So even though the
adapter is broken off internally I am told I have to replace
the whole mother board and that runs big time dollars.
The computer works fine when it runs just on the battery.
But the battery is now drained and needs some juice.

Posted by on

  • lawner Nov 09, 2008

    Thanks for your advise and help. I learned that the motherboard is ok it just requires the DC pin to be resoldered to the board. I have knowledge how to solder small items and worked with a soldering gun before. Just dont know whether it would be a hassle for me to take the laptop apart to get to the area that needs to be soldered.

  • lawner Nov 11, 2008

    Thanks for the descriptive suggestion. Even though I have experience soldering things and taking things apart the risk in taking apart a laptop for the first time may be too high and it would be best to have one who has more experience to open the laptop and to perform the soldering job. I will call it an insurance policy. If I mess up I may lose everything or run into more expensives.

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Too bad can't help you out with the motherboard man! guess you'll have to find a way to charge your battery.

Posted on Nov 07, 2008

  • cpenny29 Nov 11, 2008

    well, in disassembling laptops, you need to take extra careful.
    depending on the make, you can try removing the plastic cover on top of the keyboard area. keep in mind that these plastic that covers the whole laptop are clipped together so there are no screws so be careful not to break it.once you've removed it you will see the screws that holds the keyboard so you need to unscrew that and gently lift the keyboard slowly and you will see a ribbon cable attached to the keyboard and to the motherboard. detach that cable and remove your keyboard completely and set aside.from there you can check if you can see the adapter terminals.
    Good Luck to you! (you'll need it!)


  • cpenny29 Nov 12, 2008

    well, i'm glad you took that into consideration!
    good luck in your laptop!
    just remember, we're here to help!


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1) Check the AC adapter (Charger) to see if it is putting out 20 Volts DC.

Use a multimeter with the Function knob set to DC Voltage. If just a symbol, the symbol is a dotted line over a solid line.

If there is a multiple setting for the Function knob with DC Voltage, set it to the 0 to 50 Volt (DC) scale.

If you do not have one, or access to one, an economical yet reliable multimeter, can be purchased for as little as $10. (Less in some places)
A multitude of stores carry them. An auto parts store is but one example.
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http://www.laptoppartsnow.com/uhsdfsrzdgir779.html

This is the DC Power Jack. May be labeled as DC IN on the laptop,

http://www.discountelectronics.com/index.php?l=product_detail&p=14640

I want to show you it, and have you look at the cable end, that is coming from the AC adapter (Charger) TO the laptop.
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See the 3 pins? Arranged in a triangle? Note the socket holes in the cable end.
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The Positive (Red) probe lead of the multimeter, is inserted into the single socket hole, in the cable end.
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Read very near 20 Volts?
Have an assistant wiggle both cables. First the one from the charger To the laptop, then the one from the charger to the wall receptacle. (Or surge protector, actually)

2) Charger checks out?
Go to the DC Power Jack.

You may wish to skip checking the charger out first, and check the DC Power Jack, if you Know that the charger is good.

Battery removed see if you can wiggle one of those 3 pins around.
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Looking back at the second link above showing the DC Power Jack, note the metal prongs coming down towards the bottom of the jack.
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Note the 3 long pins sticking down towards the back of the jack.

The 4 outside prongs made from the outer case, are used to anchor the jack into place. They go down through holes in the motherboard, and are soldered on the opposite side.

There may be Ground attached to the case through these prongs also.

The two pins sticking down towards the Back of the jack, are also Ground pins. (Negative)
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A) IF, any of the pins wiggle, the jack is broken, and needs to be replaced.

B) IF, the outer shell of the jack wiggles, the jack May just need to be soldered back into place.

(Could also be an indication of more damage than appears to the eye)

Same thing for the single Positive pin solder joint.

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Symptoms of a broken Laptop DC power jack:


- The laptop only operates when you hold the DC power plug in a certain direction (DC jack is broken or loose).
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The usual signs of that are:
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If I could be of further assistance, let me know. If this helps or solves the issue, please rate it and give a testimonial for my response

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dear N9YK

you can follow this

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