Dell Latitude E6540 :: PSU Makes Strange Noises When Is Cold And Under Very Light Load
Dec 7, 2014
I have 130W(model DA130PE1-00) dell orginal PSU and dell e6540.
When i plug in PSU into my notebook, then i turn it on, and after windows loads, it starting to make strange noise. after it warm up to 30 deegres of celsius, it stops making it
I have noticed that loudness of the noise is inversly proportional to load and temperature. When PSU is cold and notebook is idling - it makes the strange noise. When PSU cold and noteboot is under moderate load - it stops making it. When PSU is warm (about 30 deegres of celsius) and is idling - i need to PSU at front of my ear.
The noise seems to coming from AC connector's side (Where PSU have connector for AC cable). PSU doesn't make this noise when i put it off from notebook.
Why PSU does make such noise? Why it is inversly proportional to temperature and load ? This is dangerous to me and my notebook ?
Exactly it looks like:
1. I turn on my notebook under AC, the PSU is making "click sound" till it become warmer.
2. After that there is buzzing sound, that is not as loud as clicking (i have to put ear at front of my PSU), and the buzzing sound is inversly proportional to load of the PSU.
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