Solved Power Comes On Can Hear Sound But A Real Light Screen Lg Television

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,y lg tv model number50ln5600-ui tv comes on have sound but no picture what is this the bulb

earlray51 your TV does not utilize a bulb. the backlight is a LED array. You will have to start checking the LED Driver/ PSU board. Remove the back off your set after you unplug it and take a good look at all the boards. Check for obvious damage like domed, leaking capacitors, loose cables etc. If all that looks ok you will need to check the fuses on your PSU as well as the various output voltages. Post some good images of your boards with your question so we can see what you see. Use this guide Adding images to an existing question for that.

Right now since you are showing a light screen, which could indicate that your backlight comes on, it appears the error is with your mainboard.