If it stays on (does the power light stay green?) and the sound is there but not the picture can you still see the menu screens if you operate the Menu button on the remote?
If the sound is there but not the picture, try shining a torch at an angle very close to the screen and check if you can detect an image at all. It will be very faint so try this is a darkened room.
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If you can detect an image you may have a faulty inverter or power board
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Here's a [https://www.manualslib.com/manual/934812/Lg-37lf65.html?page=26#manual|link] to the troubleshooting flowchart for the TV if there is no image on the screen but the sound is there.
Hi @charlotte21 ,
If it stays on (does the power light stay green?) and the sound is there but not the picture can you still see the menu screens if you operate the Menu button on the remote?
If the sound is there but not the picture, try shining a torch at an angle very close to the screen and check if you can detect an image at all. It will be very faint so try this is a darkened room.
Here's a [https://www.manualslib.com/manual/934812/Lg-37lf65.html?page=26#manual|link] to the troubleshooting flowchart for the TV if there is no image on the screen but the sound is there.