Race Control has access to Formula 1’s range of trackside cameras but it also requires CCTV for safety reasons, as CCTV covers other areas such as run-off or behind barriers that are not always covered by F1TV.
The clock continued to run down in the session while local officials worked on resolving the system.
The back-up system in place as a contingency measure also suffered a failure.
Due to the disruption, with effectively only notional running taking place, second practice will begin at 16:30 local time, half an hour earlier than planned.
The session will then last for 90 minutes, 30 minutes longer than usual.
Valtteri Bottas was notionally fastest in the session, posting a time of 1:18.728s, to finish ahead of Aston Martin drivers Lance Stroll and Fernando Alonso.