How to remove the power adapter, the four steps to remove the power adapter
1. The upper and lower covers of the power adapter are formed by injection molding or glue bonding without any screws, so they can only be cracked by violence. However, as long as the method is appropriate, the removed power adapter can be completely restored to its original state. Without careful observation, there is little sign of disassembly.
2. Place the transverse side of the power adapter on white paper, cut along the gap between the upper and lower covers of the power adapter with an electrician blade, and then knock the back of the electrician knife with a hammer to cut the electrician knife between the upper and lower covers of the adapter. At different positions of the gap between the upper cover and the lower cover of the adapter, use the tip of an electrician's knife to move along the gap. When a part of the upper cover and the lower cover begins to crack, then slowly separate the upper cover and the lower cover of the adapter.
3. Then open the power adapter of the housing. You can see that there is a copper shield outside the adapter circuit. Cut the tape on the shielding layer with an art knife, and then weld the two solder joints between the shielding layer and the internal circuit board with an electric soldering iron to remove the shielding layer.
4. There is also a thick hard plastic film between the shielding layer and the circuit board, which can be cut with an art knife.
Five steps for power adapter maintenance
First, if the original adapter has a problem and cannot be repaired or has no time to repair, you can use other adapters first, as long as the output voltage and power are roughly the same. There is a voltage stabilizing circuit inside the notebook computer. Don't worry too much about the mismatch of output voltage. During maintenance, the first thing is to prepare tools. We need multimeter, screwdriver, welding tools.
Second, there are four plastic covers on the power adapter. Try not to damage the adapter housing. After the shell is damaged, there will be problems such as enhanced electromagnetic radiation, which will affect the stability of the machine. If the housing is damaged, repair it as much as possible. If the external power supply does not supply power during disassembly, you can insert the battery and try again. If the machine starts normally, there may be a problem with the power cord or adapter. After opening the appearance and shielding layer, check the welding leg for health and observe it with the naked eye. The circuit is intermittent and usually has a poor connection. Then check whether there is a problem with the power cord with a multimeter to simplify the maintenance difficulty.
Third, during the test, if the welding of the resistance pin is found to be defective, repair it with welding tools, reinstall the power adapter, and then start the test. As a result, the problem was solved. It should be noted that if there is a problem with the capacitor during the detection process, you can buy a capacitor of the same model and capacity (the price is about 5 yuan), then weld the problem capacitor and then weld the new capacitor. If you find a problem with the IC power chip, you can solve it in the same way. Of course, because the IC chip is one of the electronic components in the power adapter, the capacitance is too complex.
Fourth, in the maintenance process of the optional power adapter, because the patch component has been widely used in the current power adapter, once the component has a problem, the maintenance will be more difficult. The power of power adapter is also increasing day by day, so the test of electronic components is also increasing. If the quality of electronic components used by the power adapter is unqualified and the PCB wiring is improper, the failure probability may be increased. Therefore, choosing a high-quality power adapter is very helpful to the stability of notebook computers.
At the end, check the capacitor resistance and inductance for problems. If the capacitor is bulging, timely replacement is a better solution to avoid hidden dangers