My NAD L40 is about 5 years old, and it works fine, but since a month or so it has been making a high pitch sound whenever it is turned on, the sound is not very loud, but it is annoying. I have even unplugged the speakers and everything connected to the receiver (aux input), and the sound is still there. This is regardless of the input (CD, AUX, TAPE, TUNER).
Re: High pitch sound even with speakers disconnected
I hav had the same problem (probably). It is a smal chopping powersuply to power the backlight of the lcd-display. It's a small pc-board mounted at the rear of the cd-cabinet, just next to the mains-power-transformer. It can be easyiely disconnected by unplugging the 3-pole connector from the mother-board, and the sound will be gone. However the display readout will faint down then, but its still readable. The higher serial-numbers don't have this problem, so an exchange of the small pc-board might be the best solution.
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Dec 30, 2008 - In my case, the monitor was fine for the first two months. But then started making a buzzing noise... 1) when on, 2) worse when .... my Samsung TV ismaking high pitched noises even if its turned off. I will NEVER EVER EVER ...
Sometimes High pitching its just that, static on the area, like if you are near a microwave, or near other electronic equipments, but, if the skreetching sound keep going or even if you do nothing it could be a line inside the sound card, or you need to clean the volume botton with special electrical cleaner. other that these, its contacts, or bad cap for the volume board inside.
A high pitch sound can be a capacitor losing power it would sound a bit like a fire work. most have back up on the board but it put more pressure on them the more times you use the tv. would check them and replace. all of them can be 5 in a row in some models.
From your description, it sounds as if the noise is coming from the circuit that controls the display backlight. If I recall correctly, the C520 has an EL backlight just like the C521 (which I have one of). On the front of the circuit board, there should be a little yellow trimmer potentiometer that controls the brightness of the display. It may be that the noise will go away if the brightness is turned down some. If the noise varies as you turn the controller, but doesn't go away completely, the backlight may need servicing.
Is your speaker making this high pitched sound or is it something else.
If it's "something else" then there is no problem to worry about. It's just an audible frequency given off from the touch screen.
How deep do you want to get into this?It sounds like the wash pump motor bearings that are worn.You can pull the unit out flip it over and wd40 the bearings in the motor or you can replace the bearings.Try to lube them first.
I think its the flyback and its starting to leak. this is a component responsible for the high voltage of your tv set. always observe safety in dealing with this. Have it check by a qualified technician. Good luck!