Laptop audio whine while charging

Soylent Joe · Oct 3, 2011, 01:30 AM

My dad has an Asus G73Jh that we got off craigslist a few weeks back. The GPU is faulty and when it's under load the system shuts off, but that's a separate problem. We hooked it up to the TV to watch a movie with the video going through VGA and the audio going to the AV receiver via 3.5mm to RCA. While charging a quite loud squealing/whining sound can be heard, and there is some faint static horizontal lines in the middle of the picture. When you unplug the charger both effects vanish. I also noticed on a recent road trip that something similar happens with my Acer netbook. While plugged into the power inverter, a squealing could be heard through the headphones.

What could be causing this? Possibly sound drivers or "dirty" power coming from the source or chargers?

robal · Oct 10, 2011, 10:41 AM

Hi,

Modern chargers are all "switched-mode" type. If they're low quality (or old), they can geterate quite a lot of noise on their output, causing interference and such noise. ("dirty power")

Car 12V -> mains AC inverter is even more noisy, and that's typical.

While I cannot guarantee it, there's very good chance that the problem will go away if you get another charger (same specs!).

Does your laptop use 12V or 19V charger ?
If you use 12V, you can easily bypass noise inverter in car by using direct cable.

Oct 3, 2011, 01:30 AM	#1
Soylent Joe Join Date: May 2009 Location: Brunswick, GA Posts: 3,031 (2.08/day) Thanks: 2,777 Thanked 676 Times in 460 Posts System Specs	Laptop audio whine while charging My dad has an Asus G73Jh that we got off craigslist a few weeks back. The GPU is faulty and when it's under load the system shuts off, but that's a separate problem. We hooked it up to the TV to watch a movie with the video going through VGA and the audio going to the AV receiver via 3.5mm to RCA. While charging a quite loud squealing/whining sound can be heard, and there is some faint static horizontal lines in the middle of the picture. When you unplug the charger both effects vanish. I also noticed on a recent road trip that something similar happens with my Acer netbook. While plugged into the power inverter, a squealing could be heard through the headphones. What could be causing this? Possibly sound drivers or "dirty" power coming from the source or chargers? __________________ Heatware SteamID

System Name:	Timucua 2.1
Processor:	i7-2700K
Motherboard:	Gigabyte Z68X-UD3H-B3
Cooling:	Corsair H100
Memory:	16GB G.Skill Ripshits X 1600MHz
Video Card:	Sapphire HD 5850 1GB
Hard Disk:	Kingston 128GB SSD + WD Black 640GB + 2x 1.5TB
Optical Drive:	LG DVD burner
CRT/LCD Model:	24" Acer G245HQ + 19" Lenovo L194
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Sound Card:	Fox Magic
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Hard Disk:	some crappy hard drives crammed into raid
Optical Drive:	some Optiarc crap
CRT/LCD Model:	Acer H5360
Case:	HAF 932
Sound Card:	Onboard
PSU:	Corsair HX750
Software:	Windows 7 Pro x64

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Oct 10, 2011, 10:41 AM	#2
robal Join Date: Aug 2008 Location: Hampshire, UK Posts: 476 (0.27/day) Thanks: 24 Thanked 108 Times in 87 Posts System Specs	Hi, Modern chargers are all "switched-mode" type. If they're low quality (or old), they can geterate quite a lot of noise on their output, causing interference and such noise. ("dirty power") Car 12V -> mains AC inverter is even more noisy, and that's typical. While I cannot guarantee it, there's very good chance that the problem will go away if you get another charger (same specs!). Does your laptop use 12V or 19V charger ? If you use 12V, you can easily bypass noise inverter in car by using direct cable.

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