Signal strength is excellent but quality up and down but only on one block of channels (BBC)

check your signal strength and quality, if bad, may be you need to re-alighn your LNB and have a good signal strength then scan all required channels will be restored

Your signal strength may be low from the wireless router

This could be too much signal thanks to the Freeview retunes going on. Your aerial is more sensitive at some frequencies, so there's more signal power higher up the frequency range. The signals for BBC and ITV are among the strongest ones broadcast. If they are now at a point on the aerial's range where they are too strong for the TV then the tuner will over-saturate. The result is the same as no signal.


Have a look online for a Variable Signal Attenuator. It's a device that can be added to a aerial signal cable just before it goes in to the tuner. The adjuster allows the signal level to be reduced. Watch the TV's signal quality and signal level displays if it has them. As signal level (power) reduces you'll actually see signal quality increase. If you go too far then quality will start to go down again. The optimum point is where quality is highest.

Check the orientation of the antenna. Try to rotate it, and see whether the signal strength varies. If the signal strength is too weak, digital channels will show many problems. Try a signal booster. Contact any service technician. http://electronicshelponline.blogspot.com/

Check the signal strength. If the signal strength is weak, this can happen to digital channels. For analogue channels, the fault due to weak signal will be a grainy picture.
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Reset your router...your signal quality will improve..

There is not a problem with the TV despite it's age this is can be due to your reception of the digital package for BBC. Have you checked through he full listings? sometimes the BBC channel will be at a different number setting because of the transmitter you are receiving. I assume you are using a digital box, you can enter a menu which will give you an indication of the strength & quality of the incoming signal. Do you pick up some of the other BBC channels such as BBC3 or CBBC? It's possible your aerial strength is a bit weak for the digital BBC package & you may need to have that looked at.

I have the same box and re-tuned mine with the same results as you.However i discovered that the NEW BBC channels were on the channel guide list starting at channel 800

just solved the problem
with the variable attenator fitted i did a rescan still didnt work
but when i did a rescan to the restore factory settings it now works