Are old Monitors and Smart TVs a security risk?

I was asked a question that I am unsure about. If someone uses a smart tv (usually running some flavor of android) as a monitor by connecting to it via an HDMI cable. Could there be a risk of any residual data being stored by the monitor? Is there any type of short-term memory that one should be aware of?

I am asking because an organization is considering giving away a few old smart TVs used as monitors but are concerned about security implications.

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from hacking: security in practice https://ift.tt/HufXMDj

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