channel 4

[chazza]

My TV in my bedroom is connected to the main aerial that the other TVs in the house are connected to.  For some reason the Channel 4 in my room buzzes loudly about half the time. It doesnt happen to any of the other TVs in the house. The buzzing gets louder when the volume is increased and vice versa. 

The only way we can find of stopping this is to hit the tuning buttons (in the front of the TV) up or down a few times to knock C4 slightly off the station that it is tuned to.  However there is no way of storing this new setting, and everytime you change channels and then go back to C4, the buzzing starts up again.  It often gets louder if there are words on screen eg subtitles (not teletext ones) or when someone is being interviewed and their name is shown.

Has anyone any idea how to stop this or what is causing it?

[chakka35]

It sounds very much as if your picture signal is encroaching on your sound channel. This would explain why the noise increases when some strong addition to the picture, e.g. a white title, suddenly appears.

When you say that the problem is cured when you knock the station off-tune you are probably, in fact,  tuning Channel 4 in properly, with the vision and sound in their proper place.

If your manual tells you how to lock in this 'new' tuning  (it should do so when explaining how to tune channels manually) then it should hold that tuning when you switch off and on again.

[chakka35]

Oi, chazza! Are you awake? Are you still here? Please speak to me.