Is there a problem with my laptop power adapter?

My computer power adapter plug in the power will be sounded, but the computer did not sound after the boot, what is the situation? The output of my power adapter is 19.5V ~ 7.7A I may not say clearly, my adapter can be used normally, but he plug in the power (alone plug the computer is not connected to the computer or the computer is not boot) will have a voice, others say the adapter in the power when there is normal voice, Of the adapter in the no-load when the sound is great

Answer:

To judge this is very simple: 1. Computer in the battery state to see if it is working properly. If you do not work, the battery has a problem 2. Remove the battery in the computer with a power adapter to see if the power is working properly. If you do not work, the power adapter has a problem 3. If the two states can work that is the computer charge management part of the poor contact and other issues.

1, strictly speaking, different brands of laptop power adapter is not common. Even if the logo on the voltage and current are the same should not be mixed, will cause the power interface or motherboard failure or even damage. 2, with the same brand of different models of the power can be used temporarily, but should not be used for too long. 3, cottage power adapter is best not to buy ...

You can repair professional and technical personnel maintenance. It is recommended that non-professionals do not open the shell repair. First of all, to ensure that the charger when the time, to avoid excessive winding, because it is likely to cause damage to the internal circuit, once the internal cable is broken, basically will not be in the power supply, and this time, even on the circuit to try Adapter is not working ...