Question about LG 47LE5400 47 in. TV

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My LG 47LE5400 tv goes from bright to dim and then to bright all on its own. It seems to occur when the light in the room changes brightness. Is this a problem or a setting that i can turn off?

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  • BAD NORAB
    BAD NORAB Jan 31, 2014

    I had the same problem with a brand new TV. Read all the suggestions here and thought that it was unlikely that it needed a new power board. Hit the AV Mode button on the remote and selected the Energy Savings menu. Turned the "Auto" to "Off." It fixed the problem.

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Your power board has gone bad and is not supplying enough power to start up the inverters. The LED lighting at all shows that you do have standby power, but that is all. You will need to have the power board replaced. Hope this helps.

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Yes you need to replace the controler board,part number 6871QCH038A.It is located under the tuner board,so you will have to take it out to get to it.

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budmrtn
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SOURCE: We recently got a new

It can be the auto-contrast is doing its jobs so LG can claim that the TV has really high contrast ratio, also try turning off auto brightness feature off. It gets real bad when the scene has dark back ground such as the dark sky with stars, the TV will really dim down to give real black sky but at the same time you can barely see the stars on the screen, LG is not the only one with this design problem, VIZIO and other has the same problem as well. If you Google your model and search for review you may see that you are not the only one with this problem.
What is the exact model of this TV.
Please let me know what you find.

Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague

Posted on Mar 09, 2011

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I have a Samsung 55in curved TV. It has auto dimming. In the evening with the lights out it dims to where it is difficult to see the picture. Can I get rid of the auto dimming?


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Your TV has a light sensor that changes the brightness of the TV based on room brightness.


It's called an "Intelligent Sensor"

You can turn this off in your "Picture" settings.

Congrats on such a nice TV purchase.

If this was helpful, please rank me a 4.

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