Are all of your normal Freeview channel listed in the guide but just show a black screen?
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Monday, 25 January 2021
J
john7:10 PM
Slough
I am in sl3 7hx.
for some time c55 has been misting, I think that went missing late December 2019.
I retune most weeks if not every time I am told new stations are available .
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Tuesday, 26 January 2021
C
Chris.SE3:53 PM
john:
Which way is your aerial pointing? If it's pointing at a bearing of 102 degrees that's slightly S of due E, with the rods horizontal, the you should get reception of all multiplexes from Crystal Palace (note Arqiva closed COM8 C56 for commercial reasons at the end of June 2020) but COM7 C55 is still transmitting.
How old is your aerial? If it's still an old Group A aerial, that could be why you have problems with C55. But note COM7 is due to close in June 2022 if not before if MNOs need to use the frequencies before then, so an aerial upgrade may not be cost effective unless it needs replacing anyway.
Make sure you don't have any HDMI cables close to aerial cables or flyleads especially if the latter are not double screened coax as HDMI can cause interference especially to C55.
I'd check all you coax plugs, connections, flyleads etc, unplug connectors check for corrosion or other problems and reconnect them. Flyleads can be a common problem, try swapping them. See what signal strengths (if any) and quality you are getting for the multiplexes shown in your TV's tuning section, this might indicate potential issues with your aerial or downlead. Also check that your downlead looks undamaged and that your aerial seems intact and pointing in the correct direction.
Problematic connections, water ingress etc. can seem to affect reception of just AN individual or several multiplexes.
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