LEDs vs TV signal

[Greynomad]

A question primarily for T1, but open for any suggestions, as others may be experiencing similar problems:
About 2yrs ago we had all our internal incandescent lights replaced by LEDs.
One of the lights is mounted under an overhead cupboard directly under the Winegard TV aerial base.
Since installing a flat-screen TV to replace the CRT, 9 months ago, we’ve been unable to use this light while watching TV as it immediately induces digital breakup. Didn’t happen with the CRT, (I suspect) because the digital set-top box was behind the TV, about 1.5m from the aerial mount. Flat-screen is all digital, but mounted where the old TV was. Cabling unchanged.
Is there a solution?

[Dot]

Our tv go feral with pixelating when certain lights are switched on weird huh? All the wiring is in conduit.

[Greynomad]

Our tv go feral with pixelating when certain lights are switched on weird huh? All the wiring is in conduit.

Shielded conduit, Dot?

[Dot]

Our tv go feral with pixelating when certain lights are switched on weird huh? All the wiring is in conduit.

Shielded conduit, Dot?

That I wouldn't know Ray the Gman is asleep so will ask him tomorrow,

[bagmaker]

all LEDs are not created equally, Dot.

[Busman]

Electrickery can be a funny thing. F and P replaced our dishwasher 3 times for throwing errors. We eventually worked out that if the light over the dining table was off when the dishwasher was on there was no problem. Go figure ! Been that way for years now.

[Macca]

We cannot read in bed while TV on as those lights send TV bonkers, as do some of the kitchen ones as well. Just turn the light off as sick of trying to find a solution.

[Greynomad]

Macca,
That's our solution, too: leave the bluddy light off!
Weird thing is, we have two LED lights directly under the TV (much closer than the one under the aerial)... which DON'T send the picture into digital break-up. Only the one under the aerial mount affects it.
Wonder what would happen if I switched the position of the troublesome LED light with one from under the TV?
HMMMmmmm... might just try that one day when I have nothing better to do (or SWMBO has no work for me... ).................

[TassyJim]

There are two basic ways of controlling the brightness of LEDs.
The old fashioned way is to have a resistor in series with the LEDs. For a nominal 12V system, you will have approximately 220 ohms in series with 3 LEDs.
With this method the current and therefore the brightness will change with battery voltage fluctuations. It also wastes some power in the resistor.

The new fangdanled method controls the brightness by rapidly switching the current on and off. This will keep the brightness constant and use less power. It will also radiate lots of nice RF which any receiver such as TV or radio will really enjoy.

I would run a mile from the switching type LEDs.

Jim

[T1 Terry]

To go along with Jim's answer, having these rapid switching type led controls on the same 12v circuit as the set top box, aerial booster of digital tv will also produce problems. You can try ferrite chokes on each cable wound through it a number of times, that often helps but you have to do the light cables as well as the cables to each device that is being upset by the high frequency pulsing. Another option is to run dedicated power cables, both positive and negative, to supply the tv and ancillary gear only, that way the battery acts as a big capacitor to smooth out the frequency ripples ..... or replace the light with a more friendly version. I've even seen some go to the extent of installing dry cell battery powered lights where problems existed.

T1 Terry