I have a big (50) Samsung telly, connected to a PC, and that goes off for a few seconds when certain light switches are operated. Any ideas Crossy please. The PC, which is in the same mains sockets, stays on, as does the sound systems.

Your tv doesn't go off, it is interference on the HDMI signal.

 

You can check that for yourself by opening the settings menu on the tv and then operate the light switch. you will see that there is no display off then.

Yes, it's evidently some kind of interference.

 

What type of lights are on the offending switches (regular, fluorescent, CFL, LED)?

Yep seen that as well.

 

It helps sometimes removing and re-plugging in firmly the HDMI cable, or getting a better quality one.

 

I have the same problem

 

The HDMI that are plugged in are  from PSI (satellite T V ), Surround sound & DVD

 

I put it down to them pinching the Nuetral - Happens with the Fluro lights + I do have an outside fan on a switch that use to be a light

 

The Electrics are all over the show with lights on mains ect 

 

I swapped to LED"S that solved the problem ( but didn;t swap all )  - It happens also with the outside fan 

 

 

1 hour ago, Crossy said:

Yes, it's evidently some kind of interference.

 

What type of lights are on the offending switches (regular, fluorescent, CFL, LED)?

Thanks Crossy. Yep, all LEDs. I'll learn to live with it. Cheers.

 

Can you try covering the remote control sensor on the front of the TV (usually a dark red square or circle) with something..then try the light switches again.

Possible cause if your are using a full size PC with ATX style power supply.

 

If the PC does not have a real ground (rod in dirt) its power supply filter circuit will have no ground point. The PC's open ground will then be picked up by the HDMI shield ground and left floating to inject all kinds of interference. TV's do not have a supply ground and all kinds of weird loops can be setup between PC's Amps and TV's.

 

Be sure your mains power source has proper ground. Always best to bring everything up to a common ground to help avoid interference and possible component damage.