137 views Yuda Electronic (HK) Technology Co.,Limited. 2020-02-04
How to repair the power adapter?
1. If the original power adapter has a problem and cannot be repaired or is too late, you can use another adapter first. As long as the output voltage and power are approximately equal. There is also a voltage regulator circuit inside the laptop power adapter. Don’t worry too much about the output voltage mismatch. When repairing, the first step is to prepare the tools. We need multimeters, screwdrivers, welding tools.
2. There are four plastic caps on the power adapter. Try not to damage the adapter shell. After the shell is damaged, there will be problems such as enhanced electromagnetic radiation, which affects the stability of the machine. If the casing is damaged, repair as much as possible. If the external power supply does not supply power during the disassembly process, you can plug in the battery and 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 check the solder feet first and observe with naked eyes. The circuit is intermittent, usually with poor contact. Then test with a multimeter to find out if the power cord is asking.
3. During the test, if the resistance pin is found to be soldered, use a welding tool to repair it, install the power adapter, start the test, and troubleshoot It should be noted that if there is a problem with a capacitor during the test, you can buy a capacitor of the same model and capacity, solder the capacitor in question, and solder the new capacitor. If you find a problem with the IC power cord, you can follow the same method. Of course, since the IC chip is definitely one of the most important electronic components in the power adapter, the capacitance is too complicated.
4. As the current power adapters have used a large number of patch components, once the components have problems, the difficulty of maintenance becomes even more difficult. The power of the power adapter increases day by day, and the test of the electronic components is also getting bigger. If the quality of the electronic components used by the power adapter is not high enough and the PCB wiring is improper, it is likely to increase the probability of failure. So it is important to choose a good quality power adapter!
5. Check whether there is any problem with the capacitor resistance inductance. If the capacitor appears bulging, it is best to replace it in time to avoid hidden dangers.
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