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My LG LED TV has a black screen. I am unsure if it has sound due to a sound bar being hooked up to it prior to it not working. any advice? what parts do I order?

I plugged my cable box into the TV to attempt to get sound and came up empty. I am assuming that could be because of various reasons such as: One or more of the boards is shot, because of the sound being set to a sound bar, or because I couldn't see what I was doing and was not on the right input. Another thing I looked into was the back lighting. This is problem that I haven't seen anyone else have. There is, but there isn't back lighting. let me explain.. when you turn on and turn off the TV, the screen flashes very briefly. I tore the back off of the TV and in a dark room, turned the TV on and off again. I could see that all of the lights flashed at once. They are all working but do not stay on. I would compare it to a camera flash. This leads me to believe that is something to do with the power supply/LED board. Like I said before, I haven't been able to find any info pertaining to my problem. I have found info and videos of the LED's flickering, which is a problem with the LED strips. But my TV is not flickering. I just want some advice on how to fix it and what parts I need to order. Thanks in advance! Serial # 50LN5400-UA

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Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electronicshelponline.blogspot.com/ To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board...

Posted on Dec 14, 2016

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Posted on Jan 02, 2017

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