Noise all using any device USB to the Satellite L655 - 19H

Some time ago I bought the laptop Satellite L655 - 19 H.
After say 2 or 3 weeks of use, I realized that sometimes it makes strange noise - like whistle not very strong, or something like that. Then I realized that it depends on the use of usb devices, when I plug in usb-flash Cards, keyboard, mouse, webcam no matter what usb device - this noise appears.
Gave my phone for warranty service, they have repaired more than 1 month, then gave me the diagnosis - problem with the motherboard, the motherboard replaced.
But the problem is always the same, the same noise. Is not too strong but after Let's say 5 hours near this large moskito makes crazy ^^.
So I have two questions:

1. everyone knows what this noise could be connected to? I am not an expert in the field of electronic devices, but spoke with a friend of mine, he said, it could be related to damaged transistors or defective to the Manger-usb or something, this is perhaps true?

2. How can I check the serial number of the motherboard that has been installed on my device, when it was produced - I want to check the warranty service guys have really done anything, and they just kept my laptop 1 month in stock and then said, he fixed, man.

Thanks for your help and best regards.

Very interesting question.
Have you noticed the same behavior with or without adapter?

# I think you're the first person on this forum who has this strange issue reports related to the use of external USB devices, so I don't think it is a general problem
# This can be problematic. Have you checked screws at the bottom of your laptop? They are like a new or it is visible that your laptop has been opened?

What you can try is to communicate with other services and ask to check again.

Tags: Toshiba

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