terrible squealing noise coming from laptop power adapter
Moderators: NeilBlanchard, Ralf Hutter, sthayashi, Lawrence Lee, Devonavar
terrible squealing noise coming from laptop power adapter
any solutions? this only happens when the laptop is off or in sleep mode.
Does this happen even when the laptop is not connected? Is it definitely from the AC-DC brick? Could be an unhappy capacitor? You could try opening it up and replacing any that look damaged (or all of them), but this will void your warranty and is a risk of electrocution/fire. Make sure you discharge every capacitor prior to doing any work.
Edit:
Found this on some forum, thought it was interesting:
Edit:
Found this on some forum, thought it was interesting:
win2kpro wrote:If the high pitched whine is not coming from a fan, then the problem is generally a defective capacitor or capacitors, either motherboard, power supply or video card capacitors.
Years ago I took a mechanics stethescrope and cut and drilled about a 1 1/2" piece of solid plastic dowel to put over the end of the stethescrope metal rod so I could hold it right up against capacitors or the side of fans to locate the source of noise.
If you don't want to invest in a stethescope just take a wooden dowel and hold one end next to your ear, and the other end on the various components.
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