Power adapter repair five steps:
First, if the original adapter has a problem, can not be repaired or too late to repair, you can use other adapters to replace, as long as the output voltage and power are roughly equivalent. There is also a voltage regulator inside the laptop, so don't worry too much about the output voltage mismatch. In the maintenance, the first step needs to be done is tool preparation. We need a multimeter, screwdriver and welding tools.
Second, there are four plastic caps on the power adapter, as far as possible do not destroy the adapter shell, after the shell is damaged, there will be problems such as electromagnetic radiation strengthening, affecting the stability of the machine. If the shell is damaged, repair it as much as possible. If the external power supply is not powered, then you can plug in the battery to try, if the machine can start normally, there may be a problem with the power cord or adapter. After opening the appearance and opening the shielding layer, it is best to first check the welding foot, which can be observed by naked eyes, and the circuit is intermittent, generally poor contact. Then use a multimeter to detect whether there is a problem with the power cord to simplify the difficulty of maintenance.
Third, during the test, if the resistance pin is found to be virtual welding, then it is repaired with welding tools, the power adapter is installed again, the boot test, the problem is solved. It should be noted that if there is a problem with a capacitor during the detection process, you can buy a capacitor with a model and capacity (the price is about 5 yuan), and then weld the problematic capacitor down and weld the new capacitor on. If the ic power chip is found to have a problem, then it can be solved in the same way, of course, because the ic chip is definitely one of the most important electronic components in the power adapter, the capacitor is too complex.
Fourth, the optional power adapter in the maintenance process, because the current power adapter has a large number of chip components, once the components out of the problem, the maintenance is more difficult. The power of the power adapter is also increasing day by day, so that the test of electronic components is more and more large, if the quality of the electronic components used in the power adapter is not good, pcb wiring is improper, it is likely to increase the probability of failure. Therefore, the purchase of a good quality power adapter is very helpful to the stability of the notebook.
Fifth, check whether there is a problem with the capacitor resistance inductance, such as the capacitor bulge, it is best to replace it in time to avoid leaving hidden dangers.
The above is the five steps of power adapter maintenance, through these five steps, you can check the power adapter well. Of course, if there is no big problem, it is best not to open the shell easily, if necessary, it is recommended to find a professional better guarantee.