Question about LG 42LP1D 42 in. LCD HDTV

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Problem with new TV

My tv hums when the backlight is at any setting other than 100 percent. This problem was present when the Tv was first set up.
The product chosen isn't the actual tv that I have, my model number is 42LG30 but this webpage wouldn't let me chose that

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The back light power supply is radiating. This can be from many things. I have seen this from a poor or missing ground shield that covers the back light power supply, and or its cable harness.

Another thing that I have seen cause this type of fault are worn electrolytic capacitors in the back plain light power supply that have become high in their ESR.


Jerry G.

Posted on Jun 02, 2008

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Posted on Jan 02, 2017

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1. Turn the TV on.
2. Press the Menu button on the remote, located right below the channel changing button.
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Hello,
You most likely have a backlight issue with this TV set. Could be the inverter circuits for the backlights. The inverter is the power supply source for the backlights. there could also be a screen driver problem. This would entail changing the entire board. You should call in an authorized LG repair center to check this set out for you. Good Luck and please let me know what you found out about this TV set.

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This made my humming sound go away completely;


From JD at oncorpus.com [manufacturer of the 32LB30Q]


Please follow these instructions, should fix the hum issue:

1. Turn tv on
2. Input mode should be tv
3. Turn volume to zero
4. With remote enter 9 8 7 6
5. A menu will appear on left side
6. Arrow down to backlight and with right arrow key move number from 81 to 83, press menu button twice,
7. Turn up volume and listen if hum is gone.

John

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The TV usually hums when the backlight setting is too low. So turning it up should get rid of the problem. To do this please follow these instructions:

1. Turn the TV on.
2. Press the Menu button on the remote, located right below the channel changing button.
3. Press the down direction button, located at the middle of the remote. Press that button until the backlight is highlighted.
4. Press the right direction button until the backlight is at 100.
5. Press the OK button and then the Exit button until you get back to your picture.

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