My LG TV brightness fades in and out!

Turn off the strobe effect.

It doesn't have a strobe effect.

If you have an alternating light effect from a strobe light or lava lamp, the TV could be adjusting its lighting level in response to the room lighting level, looking like it fades in and out.

So I need to turn off whatever variable light source is in the room.

Or just turn off all the lights to feel like you're in a movie theater, assuming you don't want to put a bandage on the light sensor so it always keeps the screen bright because it thinks it is always dark.

That's not very eco friendly.

So go to home, settings, picture, energy saving and turn off the auto setting for screen brightness so it stops adjusting so much.

I do want to use it

Off is the default, and if that's selected, it isn't your cause. But if you still want to use it, the medium setting instead of maximum so it doesn't do things as much.

What else could be causing this?

LCD TVs have to be backlit to produce their image. If the backlight is flickering, you'll get this effect.

That's going to require a bulb replacement.

That's still cheaper than replacing a power supply or mother board.

True. And if I try to take anything apart to try to fix it, I'll void the warranty.

If you take the back off, you can see if the cause is obvious like blown fuses.

I think that's when a few fuses are bigger than the others.

If the fuses are starting to fail, you'll get a screen that darkens and lightens as each fuse blows.

But I'll eventually just get a black screen eventually.

If you picked screen off on the energy saving mode, it turns off the screen while maintaining audio playback. If there's a software glitch, it could keep turning on and off.

The solution to that is a hard reboot to the TV. Unplug, wait five minutes, plug back in.

You could also have an image that's flickering because of a bad HDMI cable or bad signal.

If I don't have a satellite signal, it bounces around with the icon to tell me what brand I have but am not receiving.

If the cable box has a bad signal, it could flicker the signal on and off.

That's more of a black screen that stays black until I power cycle the cable box or call the cable company to fix it.

You can still try switching the HDMI input cable and then HDMI input to a different source to see if it is the cable or signal source.

I might as well clean the connectors and ports while I'm at it.

Or check the input, such as making sure it is at 60 MHz. If it is at a different level, it could strobe black and color or alter lighting levels.

Anything else I can check?

Turn off dynamic contrast or dynamic lighting, I don't remember what it is called, assuming the TV lets you do that.

On Samsung TVs, it is called auto dimming.

That setting can cause dark scenes to look black and light ones to look bright, so for fast changing action movies, you get normal scenes followed by black.

The test for that is changing the movie to a bright annoying cartoon and see if the other annoyance disappears.

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