Can a dodgy electric supply cause a TV fault?

[KevHardy]

Hi, turned on (LG) TV this morning and got a 'Select Item' screen and the volume graphic flashing constantly. The remote works and you can select menu items but it returns to the 'Select Item' menu shortly after.
I looked online and some suggested faulty power or HDMI cables, so I detached everything except the power cable. Same fault.
We have a smaller LG TV in the bedroom which was working so I put this in the lounge but got exactly the same fault. Which made me think it's not the TV but the power socket.
To confirm this I returned the smaller TV to the bedroom and the fault disappeared. I then took the large TV from the lounge off the wall and plugged it into the bedroom and the fault disappeared too. So it's definitely not the TV.
I ran an extension lead from the bedroom socket to the lounge, thinking this would solve the issue and confirm that it was the socket, but got the same fault.
I am now out of ideas. Could there be a voltage issue of some kind? I'm not an electrician so this is alien territory for me.

 

[littlespark]

Are you trying to watch terrestrial through an aerial or sky tv from a dish?

It may be local interference, or a problem with any wiring.

Actually…. Try changing the battery’s in the remote… or take the battery’s out and manually change settings. (Either buttons on the set, or some TVs can be controlled by a phone app)

 

[mainline]

Hi, turned on (LG) TV this morning and got a 'Select Item' screen and the volume graphic flashing constantly. The remote works and you can select menu items but it returns to the 'Select Item' menu shortly after.
I looked online and some suggested faulty power or HDMI cables, so I detached everything except the power cable. Same fault.
We have a smaller LG TV in the bedroom which was working so I put this in the lounge but got exactly the same fault. Which made me think it's not the TV but the power socket.
To confirm this I returned the smaller TV to the bedroom and the fault disappeared. I then took the large TV from the lounge off the wall and plugged it into the bedroom and the fault disappeared too. So it's definitely not the TV.
I ran an extension lead from the bedroom socket to the lounge, thinking this would solve the issue and confirm that it was the socket, but got the same fault.
I am now out of ideas. Could there be a voltage issue of some kind? I'm not an electrician so this is alien territory for me.

Have you got a sound bar which could be interfering ?