I have pixelation on a few of my channels. Was told I needed a TIVO box - new box installed still pixelation. Engineer called renewed indoor cables - still pixelation. Worst channel SKY1HD and UK GOLDHD.
Stock answer - pixellation is indicative of a signal fault, and if you've rebooted your box once, that fault needs finding and dealing with.
Personalised answer - Digital TV channels are carried in clusters (known as "muxes") which bear little resemblance to their EPG (TV Guide) positions. A fault affecting one channel on a mux, will likely affect them all.
Sky One HD is on the same mux as... BT Sport ESPN HD, Sky Premiere HD, NHK-Japan, BT Sport 1 HD, Liverpool FC TV
UK Gold HD shares a mux with...Premier Sports 2 HD, Sky Sports Racing HD, LaLiga TV, Sky Comedy HD, Nat Geo HD, Sky SciFi & Horror HD, Sky Greats HD, Freesports HD & Premier Sports 1 HD
If any of those are also affected, then you've got slam-dunk evidence of signal issues. If your indoor cables have been replaced, then perhaps there's another issue somewhere else. External cables to your streecab, a connector somewhere? Get that engineer out, and they should be tracing this.
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Thanks yes other channels are affected in the mux. I have had an engineer out, new box and asking for a street team now but as yet no action. I have to keep making time to ring virgin which is 45mins on the phone. Any short cuts you can suggest?