Hum from dell laptop power adaptor when using a sound system
I have got three dell laptops and three other brands of laptops. we teach dancing and use the laptops for music through our sound system. The three other brands i have no trouble with, but all three dells hum when on the power adaptors. Using the batteries no trouble. Is there anything i can do like using another brand other than dell power adaptor, or is there some other way of stopping the hum. STEVE
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Re: Hum from dell laptop power adaptor when using a...
Hi, as i understand you are facing this hum on all the three AC adapters, there could be any of the following reasons for that 1) If the laptops were bought within the same period and all the AC adapters came from the same faulty lot
2) Or the AC adapters are made in this way so they produce this hum always
Try calling their Tech support helpline for Dell and see if a replacement can help you or if the AC adapters have a design fault of producing hum is their a solution that they have for it
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You may have the wrong AC adaptor, Dell is very picky when it comes to Power adaptors, it must be original OEM Dell for the laptop to recognize it, any after market no name brand even though it has the right specs and is made for your model will power your laptop but the circuit to charge your battery will automatically be closed
There could be a problem with the battery. A fast check to determine whether you have a problem with the power
adapter, power cord or the laptop's battery is to turn off the laptop,
remove the battery, connect the power adapter, turn on the laptop &
see if it works.
If the laptop works directly from the power adapter
with the battery removed, then the power adapter is good. In this case
we can suspect that the battery is defective & needs to be replaced.
If this did not work, try also disassembling the laptop & make sure
that all main components are seated properly. Also make sure that all
ribbon cables interconnecting the various components of the laptop are
By chance have you tried making sure the laptop is not too close to the speakers? Sometime you will get feedback when the source is to close to high powered speakers. Also, check your jack cord and make sure no splits/cuts are visiable and the plugs are fully inserted.
Try taking out battery and plug in power. If it works, battery is faulty. If not, Try taking out your hard disk plug in power, if it works, hard disk is faulty. If not, Try taking out memory card, if there's a sound, memory card faulty. If no sound, it's your motherboard that is causing the error.
Note: If machine is under warranty no need to pay for the repairs.
The blinking orange battery light generally indicates that the battery isn't working properly, usually going out and not charging properly. In this case, since the adapter will not power the machine without the battery, and it should, I'm going to say that the adapter is going out and not getting the proper amount of power to the system. Try replacing the adapter. Be sure to replace it with a Dell replacement, the Targus brand universal adapters do not work well with Dell machines, and in most cases won't work at all.
As a system gets a little age on it, the battery naturally decays. Also, each time you plug the ac adapter into the laptop, the adapter connection on the motherboard becomes a bit looser on the solder points, all of which contributes to the symptoms you describe.
You could try a fresh battery.
The standard rule is a battery is wireds to last between 500-600 cycles, then it's dead. They claim it's a safety feature.
Good luck, hope that helps.