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20.08.2015
Unlike desktop computers, laptop power supplies (also called adapters or chargers) are much smaller because for the laptop computers the most important thing is mobility, and mobility requires components with smaller dimensions. As you may know, the weakest point of every power cord is the connection point with the connector, or in other words – this is where the cable bends the most. If the cable is damaged near the DC jack, it can be easily repaired in few steps, but you will have to cut the cable and replace the old connector with the new one, as the old will become unusable. Remember also that some manufacturers such as DELL, Toshiba, SONY and HP also use more specific connectors, which are difficult to find on the market and most likely in such cases you will need to replace the entire adapter.
3.As you can see the cable running from the power adapter to the laptop is a shielded coaxial cable. Sometimes, however, in very rare cases the manufacturer may swap the polarity of these two contacts, so before you start the repair it would be best to read the technical specifications of your power adapter.
Now let’s see how to fix the cable if it is damaged near the body of the power adapter. 3.Prepare the cable in the same way as you did above, before soldering to the connector, then remove the unnecessary part of the cable.
4.Now you can solder the wires to the circuit board, but before that I recommend you to install a rubber grommet, that will prevent the cable from excessive bending. In desktop computers power supply is realized as a metal box with many different colored wires coming out of it. Therefore, in addition to being smaller, they are also implemented as a separate unit located outside the body of the computer, which is the main difference between the two types of power supplies.


This is because most likely the original connector will have a molded casing on it and the only way to remove that casing  is to break it.
This is perhaps the most important task, because different laptop manufacturers use different connectors. Some technicians also prefer to tin the wires first by applying a thin coat of solder before soldering to the connector.
DC connectors usually consist of two parts – plastic (shell or cover) and metal (the part that fits into the DC jack of the laptop or also called barrel).
In this situation, your task becomes a little more difficult, since almost all adapters sold in the market are permanently sealed by the manufacturer (i.e. The most important thing here is to make sure that the point of failure will remain in that part of the cable which is soldered to the circuit board. Make sure to remember the location of the two wires, because an incorrect soldering would damage the adapter or even the laptop.
This box is usually mounted inside the computer and contains a circuit board with a pulsed voltage regulators providing power to different cables depending on their color.On the other hand, these cables are connected to the various components of the system like motherboard, hard drive, DVD, floppy, etc. Another significant difference is that the laptop adapter uses only one cable to provide power (usually between 18-20 volts), which is then distributed to the various hardware components by voltage regulators located on the motherboard of the laptop. On the picture below you can see both points where the cable could break most often and if you think that the time to throw away your adapter hasn’t come yet, then I think that this guide will help you continue to use it for a long time. Most power adapters have a large choke mounted near the connector, designed to stop the RF interference passing through the cable.


To be sure just cut the cord off about 5-10 cm from the body of the adapter, because as already mentioned failures occur most often in that part of the cable.
Otherwise, more cables would make the use of such devices extremely uncomfortable and also would have bad effect on mobility.
For the next example I will use the power adapter from Fujitsu Siemens laptop with output voltage of 20 volts. Inner conductor should also be stripped, but in order to avoid the risk of short circuits you have to cut only a small part of its isolation. The outer, which is most often called the sleeve is the negative (GND) contact and the inner one called the tip is the positive (V+)  contact. The reason is that sometimes the rubber grommet fixing the cable to the adapter housing is too hard, causing bending of the wires in one certain point. But mobility is associated with motion, which sometimes causes damages in mobile devices and therefore here I will try to describe one of the most common failures in the laptop power supply units that occurs in their power cords and connectors. Important: Be sure to solder the inner conductor of the cord to the positive contact and the shield to the negative one.
Just remember that longer plug is not a problem but a shorter one may not be able to contact properly with the DC jack.



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