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Barb, noise may be from a power supply/ transformer on it's way out.
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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 ...
Have the outlet checked by a qualified electrician. Sounds like either a power issue or ground. You should not get a buzz from an outlet for any reason.
If you plug something else into the outlet does it make the same noise?
If yes, something going on with the power. If not, then the TV power supply might be doing it, but the noise would be behind the TV and not the outlet.
If the model is not listed correctly let me know with the make a comment button on this page---KDL-40S2400 IS A LCD SET---usually on that model on turn on you may hear a high pitched buzz which is a issue with something on the power board making a sound---
High pitch sound on LC-42D62 is reproduced by switching transformers on power supply board. To correct this problem, you will need to remove power supply unit from the TV, spray all transformers with SILICONE CONFORMAL COATING. Let it dry for 12Hrs. Then install power supply unit back.
Below is an image of rear side of your TV, Sony KDL-40W5500 Top right corner is marked there and possible cause of noise seems back light inverter board, there are high voltage going to CCFL inside LCD panel and seems high voltage leakage causing that buzzing/ fuzzing noise.
Replace back light inverter board upon voltage leakage confirmation. Thanks.
I suspect you have a bad set of capacitors in the control module. This problem usually starts out as a high pitched noise but can lead to the TV not turning on. Please see the link below, posted by StivO. It gives step by step instructions on how to replace the capacitors. This is a very inexpensive fix.