Blanking pictures on certain channels will happen now and again as part of the digital service NTL provides. However, it depends on how often it happens. Check all your cables, especially the scart is in securely. If the blanking pictures problem continues, :
If it happens only at certain times, i.e the evening, it could be because of the network load in your area. Something that a technician or a faults agent could not fix tbh. If you phoned faults they'd probably ask you to monitor the sitation to see if it got worse.
If it happens at various times a day and happens at least once every hour, a tech will be required.
Either way, I'd advise always to report a fault, even if they agent can't fix the problem, so a note of the complaint is put on the account
