I have a Sony KF-55E200A TV (Rear projection) that uses a Sony XL-2400 lamp. The TV has been purchased recently and has run for around 100-200 hours.
I have recently started hearing a faint buzzing sound from behind the TV and seems to be more intense on the side of the lamp. I first thought it to be the fan sound. Today when I switched off the TV, I realized that the sound was related to the lamp somehow. As soon as I switched off the TV, the sound stopped. The fan was still working. The fans stopped after a couple of minutes.
What can be the cause of the sound? Is it something harmful? How to remove this buzzing sound?