![]() There might be a problem with mains power causing it. (The Dell supply I mentioned hums under light/no load, and has been fine for years.)Ī switching power supply essentially turns on and off at a high speed, and it is this cycling that can cause an audible sound. If it hums when under light or no load, it may simply be that it's making the noise as the switching circuit engages less often. ![]() My experience has been that if the power supply hums or makes noise when under load, it's probably an indication of impending failure. Under the light load, the supply may hum more loudly or not at all. When the laptop is on, backlight at full, charging the battery, etc, the power supply will be under more load than when the laptop is powered off and the battery is full (or not present). You should try putting different loads on it. ![]() Some switching/regulated power supplies seem to have a hum or a whine moreso than others.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |