There are several situations where the power adapter is broken?

5. The calorific value increases after the power is turned on and the temperature is abnormal.

Approach:
1. First, you can judge the situation according to the instructions. You can see the indicator light of the power adapter. If the indicator light is on, it is generally believed that there is no problem from the Power Supply to the adapter.
2. Check whether there is electricity between the 12V power adapter and the computer. It can be displayed by the indicator light of the notebook. When the power is charged to the notebook, the charging indicator light will be on. Otherwise, it will not light. Or try to exchange a power adapter of the same brand.
Use the power adapter to hold the other party's laptop. If the other party's computer is working properly, the power adapter is fine. Otherwise, there may be a problem with the power adapter. If the other party's power adapter is plugged into your computer, the computer works normally, but using your own power adapter does not work properly, then there is a problem with the power adapter.
3. Observe the computer's indicator light changes. If you plug in the power adapter, you can see that the charging indicator light is on and off, and it has not been off for some time, it is the problem of the power adapter interface in the notebook, generally the wire inside is broken, the circuit board is aging, welding Drop and other reasons. This is called the virtual welding phenomenon. This situation generally requires a special person to repair

4. The Power Cable should avoid breaking the internal Cable as much as possible. If the external power supply does not supply power, you can try to insert the battery at this time. If the machine can start normally, there may be a problem with the power cord or the adapter.
Then test with a multimeter to find out whether there is a problem with the power cord to simplify maintenance, and do not try to open the power adapter shell from the beginning. The difficulty of opening the cover of the power adapter is really too great.
5. If there is a problem with the original adapter and it cannot be repaired or is too late to repair, you can first use another adapter to replace it, as long as the output voltage and power are roughly equivalent. There is a voltage stabilizing circuit inside the laptop. Don't worry too much about the mismatch of output voltage.
6. Do not damage the shell as much as possible. After the shell is damaged, there will be problems such as enhanced electromagnetic radiation, affecting the stability of the machine. If the shell is damaged, try to repair it. After opening the appearance and opening the shielding layer, it is best to check the soldering feet first and observe with naked eyes. The circuit is intermittent, usually due to poor contact.
7. The manufacturer of the power adapter checks whether there is any problem with the capacitance, resistance and inductance. If the capacitor is swollen, it is best to replace it in time to avoid hidden dangers.