Global electronics giant Samsung has been hit by a mysterious glitch that is causing several of its television models in regional South Australia to lose signal and turn off.

Technicians say the issue was first reported on Friday in the Riverland and the state's south-east, and appears to be isolated to the two regions.

But at least one resident in the Victorian town of Langkoop has also reported the glitch.

Scores of owners have taken to social media, puzzled by the problem.

Electronics store worker Brendan Albrecht, who is based in Berri in the Riverland, said the issue was widespread and affecting multiple models.

"At this stage, it's anything that's roughly three years old to eight years old," Mr Albrecht said.

"Samsung are working on it at the moment — they're aware of the situation — but they haven't come back to us with what the cause is or what can be done to fix them at this stage."

Another store operator, who did not want to be named, told the ABC he was aware of some customers who thought their television was broken and replaced it with a new one.

The ABC understands a new signal was switched on by WIN Television last week in preparation for the launch of Sky News — which is due to begin broadcasting on free-to-air next month.

Mr Albrecht said customers had speculated whether that had caused the glitch.

"That seems to be the coinciding thing that people are saying, but whether or not that caused this issue [we] don't know for sure," he said.

New signal switch could be behind the glitch: expert

Richard Pascoe told the ABC either the new signal switch, or a software update from Samsung, could be behind it. ( ABC Adelaide: Brett Williamson )

Tech expert and media commentator, Richard Pascoe, told the ABC either the new signal switch, or a software update from Samsung, could be behind it.

"It might not be a quick fix at all, that's what concerns me about this," Mr Pascoe said.

A WIN TV representative confirmed the network switched on a new signal last Tuesday, but said the broadcaster did not believe that had played any part in the glitch.

The network declined the ABC's request for an interview.

In an email, a Samsung spokeswoman said the technology giant did not send any software updates out last week.

"I would like to clarify that Samsung did not conducted (sic) any software or firmware updates to our televisions during the time that the issue has occurred," she said.

In a statement, Samsung also urged affected customers to contact the company.

"Samsung is aware of the reported TV issue impacting some of our customers in the Mount Gambier region in South Australia. We are working closely with our partners to identify the cause and to find a solution as quickly as possible."

"Any Samsung customers who are impacted can contact us via 1300 362 603 or samsung.com.au."