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Dodgy AC Jack

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Dodgy AC Jack

Postby adam81 » Thu Jul 23, 2009 2:31 pm

My laptop was showing signs of a dodgy power jack, wiggle the ac jack and the light comes on, wiggle again and it doesn't. 100% this was the issue.

I pulled it apart and first attempted a bit of glue to fix down the ac jack, when I put the laptop back together it failed to charge or run from ac, so I pulled it apart again and bought a new jack and soldered it in. Still exactly the same problem. I've put a multimeter across the jack, and am getting 20 volts from one of the pins to the board, but the other 2 pins show continuity between them and are not supplying 20 volts to the board.

I'm at a loss now, does anyone have any idea which pins should supply power to the board or not?
Cheers
adam
adam81
 
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Joined: Thu Jul 23, 2009 2:25 pm

Re: Dodgy AC Jack

Postby KitamuraComputers » Sat Aug 15, 2009 11:58 pm

adam81 wrote:My laptop was showing signs of a dodgy power jack, wiggle the ac jack and the light comes on, wiggle again and it doesn't. 100% this was the issue.

I pulled it apart and first attempted a bit of glue to fix down the ac jack, when I put the laptop back together it failed to charge or run from ac, so I pulled it apart again and bought a new jack and soldered it in. Still exactly the same problem. I've put a multimeter across the jack, and am getting 20 volts from one of the pins to the board, but the other 2 pins show continuity between them and are not supplying 20 volts to the board.

I'm at a loss now, does anyone have any idea which pins should supply power to the board or not?
Cheers
adam


There's only the center pin leg that should be supplying voltage, as that's the + terminal. Then there's the - pin, which is the part of the socket that touches the outer side of the plug. The other is simply a ground pin, which won't have any voltage across it unless there's an earth fault. Looking at the bottom of the socket, the center pin is usually the rearmost pin, and your negative and ground are the two side ones.

Check for any dry joints, and make sure your copper pads are clean and free from grease or contamination, this itself can cause a poor connection. The solder may look clean, but it could be "dirty". Overheating the joints during de-soldering can cause problems too. Did you use a solder sucker when de-soldering, and did you "tin" the tip of the iron with solder when re-soldering the new one?

What model FSC laptop are you using?
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KitamuraComputers
 
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Joined: Sun Feb 22, 2009 7:41 pm
Location: Birmingham


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