Laptop power system is second only to the CPU and motherboard, the third key component of the display. The power supply system includes a power adapter, rechargeable batteries and power management systems. Do not think that the power adapter is a high-tech products, in fact, laptop power adapter now has a technically very mature product, some parts of the south of the country small workshops can produce a relatively excellent quality products. Although the notebook power adapter is low-tech products, but also a lot of problems. Power adapters mentioned below, unless otherwise specified, are specific to the laptop power adapter. A failure analysis Here’s a look I failed IBM 600E notebooks it, recently, I found that when using an external Apple Laptop AC Adapter that the brain does not turn on the notebook, you can successfully use the battery. In the from easy to difficult, from the outside into the inside principle, I first test with a multimeter power lines, namely Figure 1 eight-shaped line, after I detected that the power line is open. I consider that to go to war again open repair this power cord is not much sense (the main consideration apart and will seriously affect the appearance of the power cord, undermine the overall coordination of the laptop), so consider looking for alternatives, I stumbled across this line and Almost on the radio, it can be said to be entirely generic. Then I got put on a normal use. However, new problems soon appeared, fault performance for notebook computers often down, good times and bad performance, sometimes even a little bit to move the machine, it may cause the machine down. Use, often appear so on the screen flashes. Two cases together, the exclusion of the LCD screen under the premise of their own fault, I initially identified a problem with the Asus Laptop AC Adapters circuit, so I will look to invest in the power adapter, laptop power supply circuits inside the computer in general is not easy to go wrong , the power supply circuit in question, the general problem still lies in the power adapter. Now notebook power adapter extensive use of SMD components, once the elements of a problem, the difficulty of maintenance is even more increased. With the power adapter power while increasing day by day, so a test of electronic components is growing. If the quality of the electronic components used in the power adapter, but off, PCB layout inappropriate, it is likely to increase the chance of failure. The following is the author of some of the repair process lessons learned, we hope to help. If you have a problem, the original adapter is not too late to repair or maintenance, you can use other adapters alternative, as long as the output voltage and power can be roughly. Laptop propped internal regulator circuit as well, not too worried output voltage does not match the problem as much as possible not to damage the adapter housing, the rear housing damage, there will be strengthened electromagnetic radiation and other issues affecting the machine stability. If the casing damage repair as much as possible. After opening the skin to open the shield, it is best to first check the fillet, the naked eye can be, circuit intermittent, generally poor contact. Tie the cord when try to pay attention, to avoid the formation of internal cables broken circuit. If the external Dell power supply is not, then you can plug in the battery try, if the machine starts normally, there may be a problem with the power cord or adapter. Then use a multimeter to detect, identify power lines if there are problems, in order to simplify maintenance difficulty, do not begin to try to open the adapter housing. Difficulty open adapter housing is really too much.