DC Power Jack Repair

This will explain how to repair a failed or loose DC power jack on a laptop.

 

First of all, you’ll have to disassemble your laptop and remove the motherboard.

 

For this repair you’ll need the following tools.

1. Soldering iron or soldering station. I use Weller WES51 soldering station and for this job I set temperature to about 800-850°F.

2. I use high-tech rosin core silver-bearing solder from Radio shack with diameter 0.022″ ( Catalog #: 64-013 ). I think standard rosin core solder will work just fine.

3. Desoldering pump for removing solder around component leads. I use Edsyn

Soldapullt pump, model DS 017.

4. 99% isopropyl alcohol and tooth brash for cleaning the motherboard from flux.

5. A new DC power jack.

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Laptop DC power jack repair guide.

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As you see on the following picture, the solder drop on the positive terminal looks different than on other three contacts. That’s where the problem is. The positive pin is not making a good contact with the motherboard and because of that power to the laptop cuts off when I move the power plug inside the power jack.

 

I’m going to desolder the power jack from the motherboard, clean contacts on both power jack and motherboard and then solder it back in place – this is the proper way fixing the power problem.

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Start desoldering process with adding some new fresh solder to all three contacts. This will make old solder more flowable, easier to remove.

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While heating one of the contacts, remove the solder from this contact using the desoldering pump. Repeat the same steps with all power jack contacts until you remove as much solder as possible.

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Grab the power jack and carefully try removing it from the motherboard. Most likely you will not be able to remove the power jack the first time because there will be some solder bridges left between the contacts and traces on the motherboard. Carefully wiggle the power jack without applying any significant force and at the same time heat up all contacts one by one. This will help you to remove the power jack.

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The DC power jack is almost removed from the motherboard.

Be careful. Inside the positive hole there is a copper sleeve witch connects the terminal

on one side of the motherboard with the traces on the other side. If you are removing the power jack with force, you can pull the sleeve from the hole. You don’t want to do that.

 

So, do not apply any force and make sure the solder is melted when you are removing the power jack. I hope you understand what I’m talking about.

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After the power jack is removed, clean all oxidized contacts with a knife.

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Apply a fresh coat of solder to all contacts on the power jack.

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The power jack terminals will look dirty because of melted flux.

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You can remove the flux using the tooth brash and alcohol. It’s not necessary but it will make your job looking clean.

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Apply a fresh coat of solder to all power jack terminals on both sides of the motherboard.

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This side has been coated.

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And this side has been coated too.

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Now you can install the power jack back on the motherboard. Put something under power jack so there is no gap between the jack and the motherboard. Now you are ready to

solder the jack back in place.

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Solder all power jack pins.

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The job is done and the laptop DC power jack is fixed. B-E-A-utiful! Now just install the motherboard back into the laptop and you are done.

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