T400 LED LCD (Samsung) buzzing when lowering brightness

Hi,
my LCD screen was recently replaced.
Just now, when lowering the display brightness, starting at 2 below max, my Samsung LED Screen omits a buzzing noise. It gets louder the more i lower the brightness. It is only really audible when i listen to it, so it is not that disturbing, however i would like to know if this is normal behavior?
I know from LCD TVs that some buzzing coming from the backlight inverter is normal, however, i am pretty sure my old LG screen was dead silent - even on lowest brightness.
Is my inverter going downhill or is it normal? Would appreciate other experiences. If someone would be so kind and check, put your ear to the left display hinge and lower brightness to 0.
Thanks.
Thinkpad T400 (Windows 7 Ultimate x64)

Guess i will have a service center to listen to it then. Since i do not use the lowest settings at all usually, it does not bother me that much. But if this indicates that the inverter may at one point break i might as well have this fixed.
Thinkpad T400 (Windows 7 Ultimate x64)

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