You will get a some noise from the scan coils surrounding the tube neck. The wire in the coils vibrates to some degree at the operating frequency of the set. It shouldn't be so much that it's easily apparent. You certainly shouldn't notice it with the TV at a reasonable distance and normal sound level. During manufacture the spaces around these coils are filled & coated with sealant to secure them and to minimise this vibration. Sometimes it drys out, cracks and fails or didn't take correctly during manufacture. It can be very annoying. I don't know the age of this model but if it's under warranty you need to report it, as the coils are an integral part of the picture tube. Sometimes it's possible for an engineer to inject fresh silicone sealant (a type with very specific electrical characteristics, btw, designed for high voltage TV applications). Personally, I never found this very sucessful and it usually requires replacement on the picture tube. If it's very bad and just out of warranty, I would contact your dealer or Toshiba Customer Support and ask if they will help. It can occur with 50Hz or 100Hz tv's. It's because the vertical scan frequency is within audible range that you pick up the vibration of unsecure coils. Expect some noise from your TV if you listen closely, (after all I'd vibrate a bit too if I was connected to the mains supply :oP) but if it's so bad it's disturbing your viewing, it's because a coil (almost certainly the scan coils) is not fully sealed.
Cobweb, October 2004
