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The LG 60LM6450 is a 60-inch LED television released in 2012. It supports 3D video with glasses at a resolution of 1920x1080 pixels.

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tv comes on with sound but black screen

good day to all got a LG 49LF5400-UB which suddenly jus went black but the sound was still there and i could still use the remote jus couldnt see anything on the screen. so i held a bright light next to the screen to see if there was any image but there was none so i opened it and saw that when i on it the back lights would come on but the screen still remained black with sound. so i ordered a t-con board and replaced the existing one but it did the same thing . do i need to replace the mainboard or powerboard or is there something else thats wrong .id greatly appreciate some help

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Same problem with mine, so frustratingly annoying

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A black screen can be caused by a number of problems:

  1. Defective LED or strip of LEDs that provide the “back light” for the picture. This can be confirmed by using a a flashlight. Point the light at an angle to the screen (with it on) and you should see a shadow of the picture on the screen. This means that the panel is working and the backlight is not.
  2. If the flashlight test fails, then it is possible that the “T-Con” board or the processing of the image is not working properly. This may be a separate board or part of the main board.
  3. It is also possible that the power supply for the backlight has failed.
  4. There is a slight possibility that the panel itself has failed too although this is rare.

Reset ALL components by unplugging them for 5 minutes including the TV. -Be sure all COAX CABLES and HDMI CABLES are tight and properly connected. - If you CAN pull up the TV MENU when you have the black screen, update your TV's firmware to be sure your TV is up to date and rule out the TV as the problem.

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thankx for such a quick response . so i took boards out and inspected the original one with phone camera and noticed a black spot .i took a picture of the original board and also the one i ordered which im not really sure if its the one i needed even if they look identical . id like to know if its the right board i ordered and if possible the cause of the burnt spot. images below show both boards

Block Image

Block Image

circled one is original

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kelvin sarà eternamente grato.
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