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Hissing noise while charging netbook

post #1 of 11
Thread Starter 
Hi, I just bought a netbook from Newegg. The Asus eee PC 1001px black. It was refurbished. It has a Atom at 1.66ghz and 1 gb of ram. Upon recieveing it, the connector to charge the netbook was broken (the metal ring on the outside has fallen off (connected to the ground wire) leaving only the small "inner" part of the connector (connected to the positive wire). So I emailed newegg and asked for a new charger. But seeing as I had the charger and the netbook in working order, it bugged me that all I had to do was connect to two to be able to use my netbook. First I played around using the 30% battery that was left in the battery when It arrived. But finally it died so I hunted around the find the right connector for the netbook and as luck would have it, I found one. I wired them up (triple checking the right polarity) and connected them to find out it works.

After connecting them I realized that a high pitched hissing or whining sound comes from around the power button where the screen meets the keyboard. It only makes this sound when the computer is on and plugged in charging. If it is turned off and charging, it does not make and hissing noise. Just when the netbook is on. And if I remove the battery, it still making the hissing noise.

So I guess my question would be, is this ok? I don't mind the hissing much, but is it a bad sign in any way? I'm not sure. Seeing as the type of connector shouldn't have an affect on the power drawn or given to the netbook, it couldn't be my handywork, could it?
post #2 of 11
I get a hissing sound from my hp dv7 laptop but it comes from the power brick and not around the power button. When its really quiet in the room its pretty annoying to hear it (just loud enough to be annoying).
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post #3 of 11
the noise comes from the netbook taking to much power from the charger so most likely the volts isnt right check the bottom of the netbook and charger to see if it matches if it does then something is making it draw to much power

also yes it will be fine for the netbook except it will slowly fry the charger (my guess is you will have possibly about 3-6 months)
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post #4 of 11
Quote:
Originally Posted by AZZKIKR;15350465 
I get a hissing sound from my hp dv7 laptop but it comes from the power brick and not around the power button. When its really quiet in the room its pretty annoying to hear it (just loud enough to be annoying).

the same thing went on with my gateway netbook. it would only buzz when the laptop was off and the battery was charging, but the buz came from the power brick, not the netbook.
post #5 of 11
my guess is the amperage or voltage raring doesnt match on the charger. i woudl stop using this as it could mess up the laptop or battery.
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post #6 of 11
Thread Starter 
checked the power supply on the charger, it's rated at 2.1 amps and 19volts. I checked it with my multimeter and it outputs at 19 volts. The netbook takes 19 volts and 1.58 amps
post #7 of 11
theres your issue. youre goin to ruin your battery/netbook if you keep using it. too much amperage being pushed at the netbook is bad. if it was the other way around and your netbook required more amps than the charger could put out, the charger would die. so dont use it lol
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post #8 of 11
Quote:
Originally Posted by Tipless View Post

theres your issue. youre goin to ruin your battery/netbook if you keep using it. too much amperage being pushed at the netbook is bad. if it was the other way around and your netbook required more amps than the charger could put out, the charger would die. so dont use it lol

That is, as far as my experience has taught me, 100% absolutely false. Voltage must always match but the amperage rating of a laptop is the maximum load you can expect it to draw while the amperage listed on a power supply is the maximum you can expect it to supply. As long as the power supply can accommodate the expected draw of the laptop, it is fine (so long as the voltage is exactly the same or at least VERY close). Even the monkeys behind the counter at Radioshack know that, dude; shame on you. I registered here just so I could put your post right. Also, the hissing is likely a capacitor (or similar component). Replacing the power supply with a brand new one, or getting brave and finding the problem capacitor and replacing it (not recommended) should eliminate the problem.
post #9 of 11
The crazynorweegian isn't so crazy.
post #10 of 11
Also, try holding the casing of the power supply (assuming that is where the hiss is coming from) tightly in your hand. Try to press the two flat sides with the most surface area (usually where the specs and model number are listed) together fairly tightly. Do that for a minute and see if the hissing is much quieter or is completely gone. If it is, make a metal (not wood or plastic or rubber) stick I folded thick .5" wide metal strapping with the holes in it every inch or so and once it is folded (length wise) into a bar about half of an inch to an inch tall, wrap it in high temp electrical tape (to keep the surface safe to touch due to sharp edges and the inevitable high surface temp that will be transferred to the metal strap) and use about 4 zip ties to secure it against the flat side of the power brick that has the specs listed on it. You may have to make two of those bars and put one on each side to get enough Newton meters on there. wink.gif

It looks kindof MacGyeverish, but it might buy you some time and sanity between power supplies or computers.
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