In this guide I remove the motherboard and repair the DC power jack in a Dell Inspiron B130 laptop. You can use same instructions for Dell Inspiron 1300 and Inspiron B120 laptops. All three models have same type of body.
In my case the power jack started failing intermittently. The laptop started switching from AC to battery power on its own. In order to switch it back to the AC power I had to fiddle with the adapter plug and find the right position. I tested the laptop with another adapter and it failed exactly the same way. I came to a conclusion that the DC power jack is not making good contact with the motherboard and has to be repaired.
In Dell Inspiron 1300/B120/B130 laptop the DC power jack is soldered to the motherboard. If the jack is broken, you’ll have to unsolder it and replace with a new jack.
Let’s start removing the motherboard.
Before you start taking the laptop apart, do not forget to turn off the power and remove the battery.
Lift up the right side of the keyboard cover with a small screwdriver and continue removing the cover with your fingers.
After the cover is removed you can access two screws securing the keyboard. Remove both screws.
Lift up the keyboard and place it upside down on the palm rest.
Now you can access the cable connector and release the cable.
Unlock the connector, pull the cable and remove the keyboard.
On the following picture the connector is displayed in the unlocked position.
Remove two screws securing display hinges on the bottom of the laptop.
Remove two screws securing display hinges on the back side of the laptop.
Disconnect the video cable connector from the motherboard.
Disconnect the wireless card antenna cable.
Remove the display panel assembly.
Here’s an example of removing the LCD screen from a Dell display panel.
From the bottom of the laptop you can access the hard drive, memory modules, wireless card, optical CD/DVD drive and heat sink.
Remove the hard drive cover.
Pull the hard drive assembly to the left and remove it from the laptop.
Remove one screw securing the optical CD/DVD drive to the laptop base.
Pull the drive from the laptop and remove it.
It’s not necessary to remove both memory modules and wireless card for the purpose of this guide but you have to disconnect the Wi-Fi antenna cable.
Loosen four silver screws securing the heat sink.
Pull the heat sink up and disconnect it from the processor.
As you see, in my laptop the heat sink is clogged with dust and needs a good cleaning.
Remove all marked screws from the bottom of the laptop.
Remove eight screws securing the top cover.
Disconnect the touch pad cable.
Disconnect the lid close switch cable.
Disconnect the CMOS (RTC) battery.
In this model the lid close switch is discrete module and mounted under the fight hinge.
If the lid close switch failed, you can remove it and replace with a new one or simply unplug the faulty switch from the motherboard and use the laptop without it.
Separate the top cover assembly from the laptop base and remove the cover.
Remove five screws securing the motherboard.
Disconnect the speaker cable from the motherboard.
Start removing the motherboard from the right side as it shown on the picture below.
Remove motherboard from the laptop base.
The DC power jack is soldered directly to the motherboard.
I assumed that the power jack is not making good contact with the motherboard and I was correct.
As you see, there is a crack in the solder joint around the “+” pin.
The “+” pin got oxidized and not making good contact with the motherboard.
If you resolder the jack without cleaning the “+” pin, your repair will not last.
It is necessary to unsloder the power jack, clean all contacts and solder it back to the motherboard.
On the following picture you see the same jack soldered back to the motherboard.