When I plug external powered speakers into the headphone socket I get a crackling noise from the ac adaptor, when I unplug the ac adaptor the crackling stops
Allan, It sounds like you have what is called a ground loop. A ground loop can occur when two pieces of equipment are connected together through a home or buildings safety ground through the same power source. For instance, your PC is connected to a power source through the AC adapter or plug, and your external powered speakers are receiving power from the same power source. The surrounding cables as well as the AC adapter(s) can act like an antenna. This will cause a low hum or crackling that would be audible through the speakers or headphones.
You may want to try plugging all components into a power strip so they are all on the same circuit. You may also want to be sure that the AC adapter cables are not not laying or running across other electrical components plugged into a different socket.
If you get the same hum through your headphones check to see if the headphones were manufactured with shielded cabling. A shielded cable is made with a wire mesh around the outside that helps reduce electrical noise. Hope this helps a little. Thanks!
SOURCE: my external speakers wont switch off when I plug a
first u are talking abt en u internal spekar when u plug headphone or speakar did the both spekar ply the sound i mean internal & ext. (problem in your head phone pin or in jack which not push the jack properly) or jack pin touch cutoff pin check it
SOURCE: The internal speakers all of
sounds like the sound card board has a short. depending on the notebook, this may or not be replaceable. take it in and see if the board can be replaced
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Thanks for your help, I have discovered it was an earth problem with the powered speakers causing a crackle from the ac adaptor.
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