AC adapter buzzing noise when laptop under load.

Barrett_killz

Estimable
Mar 7, 2014
17
0
4,560
0
Greetings. I tried to launch a CPU intensive game today, and as soon as I start it, I hear some sort of a quiet buzzing sound coming from my AC adapter. As soon as I shut it, the noise is gone. I'm starting to worry that the adapter might be dying. Tried different power outlets, same problem. Does anyone know if it's normal or what is actually happening?
 

Dunlop0078

Estimable
Herald
Feb 13, 2014
351
0
5,260
76
It's called coil whine. It's usually quite normal and nothing to worry about, a coil in the power supply is hitting a resonant frequency under load and is vibrating thus producing the buzz. It's a very common phenomenon found mostly in GPUs when running at very high framerates say in a menu or something, or in power supplies.
 

Dunlop0078

Estimable
Herald
Feb 13, 2014
351
0
5,260
76
It's called coil whine. It's usually quite normal and nothing to worry about, a coil in the power supply is hitting a resonant frequency under load and is vibrating thus producing the buzz. It's a very common phenomenon found mostly in GPUs when running at very high framerates say in a menu or something, or in power supplies.
 

Barrett_killz

Estimable
Mar 7, 2014
17
0
4,560
0
Wow, now this is something new. The fun part is that the sound appears and disappears exactly when I want it to. For example, when I close the game or ALT+TAB from the game, it's just gone. Hopefully it won't melt, because I already had one adapter melted, after I messed it up a while ago.
 

Dunlop0078

Estimable
Herald
Feb 13, 2014
351
0
5,260
76


Well yes it will likely appear and disappear depending on load, if you close a game or alt-tab from it you just took a large load off of the power supply. Coil whine wont cause a power supply to melt lol.
 

Dunlop0078

Estimable
Herald
Feb 13, 2014
351
0
5,260
76


No problem. Just search 'coil whine' if you are worried about it, it's quite a common issue.
 

Barrett_killz

Estimable
Mar 7, 2014
17
0
4,560
0
Yeah, I did some research, seems like a pretty "natural" thing. The adapter I'm using is a replacement one, not an original adapter, but I'll definitely get a new original one in the near future, as long as it's just a coil whine.
 

Dunlop0078

Estimable
Herald
Feb 13, 2014
351
0
5,260
76


Is it just some cheap power brick you got on amazon or something? If so getting an OEM brick would not be a bad idea. Normally quality power supply's coat their coil's is some type of rubber or plastic to try and prevent coil whine, cheaper power supply's often wont.
 

Barrett_killz

Estimable
Mar 7, 2014
17
0
4,560
0
Pretty much yeah. I'm a student, and short on paper at the moment, so I decided to cheap out on a power adapter, which is not a good thing to do, of course. Problem is, I have an ASUS K501, which requires a 4.74A adapter. The original one is pretty expensive, it's about $80. But I'll buy a new one, for now I'll stick to the buzzing one, it doesn't bother me too much..
 

captaincharisma

Distinguished
Oct 13, 2004
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just to remind you that it is understandable if you are on a tight budget and have to cheap out on some things but cheeping out on something major like a power supply for a laptop is not really one of those things. this can start out as coil wine but next could be a power surge from it malfunctioning and then you will be out a laptop which will cost a heck of a lot more then a power adapter

 
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