MobileRead Forums - View Single Post - high-pitch hum while charging

lorenzoens · 04-29-2011, 06:10 PM

Updated: I replaced my ac cord and the hum seems to be gone.

Here's the updated report:
Since i replaced the ac cord, the high pitch hum comes out from the power brick with a minor intensity and only when the battery is fully charged.

If I turn on the device with NO BATTERY in, the hum comes out strong and a bit lower as pitch. The hum peaks evertime I perform some kind of action on the eDGe. If I turn off the unit, the hum stops

I'm waiting for cust support to know if they still think I have to return the unit for replacement. By my opinion, if there's a problem it's in the power supplier and not in the eDGe.
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I'm in Italy, and my power supplier SOMETIMES (I have no idea if particular conditions may cause it) makes a very high-pitch hum while charging. The more time it charges, the stronger the hum. But only SOMETIMES, let's say 50% of the times.

I have a spare battery and the hum is the same with it too. On both batteries the code is 0410

While charging the device, the led is usually green and blinking. Note that usually I dont use the battery 'til complete discharge.

Yes I did try to charge the device in many different power outlets, and in different houses

Without the battery no noise seems to come out, but I tried it just a couple of times.

Support asked me to send back the device for replacement! Now, I'm in Italy, I own the Edge from a month and I have to ship it to USA already, it would be a bit pricey shipping, and I couldnt work with the EE for at least a month, I think.

What would you do?

Note that I replaced by myself the AC chord from the power supplier to the AC plug, as it came with a USA kind of plug.

04-29-2011, 06:10 PM	#1
lorenzoens Edge User	high-pitch hum while charging (solved?) Updated: I replaced my ac cord and the hum seems to be gone. Here's the updated report: Since i replaced the ac cord, the high pitch hum comes out from the power brick with a minor intensity and only when the battery is fully charged. If I turn on the device with NO BATTERY in, the hum comes out strong and a bit lower as pitch. The hum peaks evertime I perform some kind of action on the eDGe. If I turn off the unit, the hum stops I'm waiting for cust support to know if they still think I have to return the unit for replacement. By my opinion, if there's a problem it's in the power supplier and not in the eDGe. ---------------------------------------------------------------------------------- I'm in Italy, and my power supplier SOMETIMES (I have no idea if particular conditions may cause it) makes a very high-pitch hum while charging. The more time it charges, the stronger the hum. But only SOMETIMES, let's say 50% of the times. I have a spare battery and the hum is the same with it too. On both batteries the code is 0410 While charging the device, the led is usually green and blinking. Note that usually I dont use the battery 'til complete discharge. Yes I did try to charge the device in many different power outlets, and in different houses Without the battery no noise seems to come out, but I tried it just a couple of times. Support asked me to send back the device for replacement! Now, I'm in Italy, I own the Edge from a month and I have to ship it to USA already, it would be a bit pricey shipping, and I couldnt work with the EE for at least a month, I think. What would you do? Note that I replaced by myself the AC chord from the power supplier to the AC plug, as it came with a USA kind of plug. Last edited by lorenzoens; 05-14-2011 at 08:40 AM.