Question about LG 55LN5710 55" LED TV 1920x1080, 120 Hz, HDTV

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LG LED TV screen goes black. LG - 55LN5710-UI

First, it stayed on for about 20 minutes. Turning unit off/on fixed it. Now it goes black after 1 second. Audio remains on the whole time. What's the best way to diagnose what has failed?

Posted by Steve w an LG on


1 Answer

The Knight

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  • LG Master
  • 76,455 Answers

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.
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 May 16, 2016

  • 2 more comments 
  • Steve w an LG May 16, 2016

    Hello Knight, thanks for the prompt response. How do I tell if it is the main board or the Tcon board?

  • The Knight
    The Knight May 16, 2016

    Just try a hard reset. If the fault is with its main board, it should be rectified when you switch it ON after reset. If not, replace it.

  • The Knight
    The Knight May 16, 2016

    There are two methods to reset TVs. The first is simple to do; a Hard Reset. The other is somewhat skilled; is a Factory Reset (System Reset). To make it a hard reset, just unplug the TV from AC mains wall socket, and re-plug it back after 15 minutes or so. If you do this by overnight is better. This procedure will make it a hard reset. If you want to make it a system reset [Factory Reset]; you have to enter its service mode option, and select the factory reset option. If you wish to get some details; check the site linked here. Pull up older posts.
    Service mode entry, adjust and exit procedure to many popular brand TVs are given. Never forget to exit the service mode, after all adjustments have been done.

  • Steve w an LG May 16, 2016

    I had taken the TV down last night to pull the boards to get part numbers and see if I could at least find them if I needed them. So effectively, it had the hard reset you described. I reassembled the TV and hung it back on the wall. Came right on and has been on for over an hour now. Assuming it could be one of three things: the reset corrected it; I accidentally plugged the cable box into a different HDMI port; or, I now plugged the unit directly into a wall outlet versus a power strip. I did have a power strip partially trip a few times years ago making an old CRT unit go wacky. Wondering if that could be it. Will continue to monitor and also truly appreciate your help.



4 Related Answers


Shukai Fung

  • 178 Answers

SOURCE: bottom half of screen goes black, what could be wrong?

Loose connetion on the Y-buffer board.

Posted on Apr 17, 2010

SD Tech

SD Tech

  • 14553 Answers


THIS set uses 2 boards inside--one drives the left and the other the right side of the screen.

You have to id which is which (GOOGLE?) AND replace it-every brand has different names for these but it sounds like your problem

Some research (you or me) should give a board breakdown for this model---not looking for main or power board but another like sustain etc. and there will be 2 listed (for right and the left sides)

Posted on Mar 25, 2012


The Knight

  • 76455 Answers

SOURCE: Hello! My TV only shows picture for less than a second, then the screen goes black again. It's like a flashing. I replaced the led driver board. Bad Tcon? It has an LG Panel, LC500DUE SF R1 thanks!

It sounds to be a main digital board fault. Contact any service technician to make it confirm; before replacing the same.

Posted on Dec 24, 2015


  • 75 Answers

SOURCE: How do I determine if it's the LED Driver or the LED lights that are bad on my LG LED TV?

If it was the LEDs, then you should still have some working. My first thought would be the LED driver circuits.

Best of luck.

Posted on Feb 23, 2016

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Tv on but no picture

How about the inverter board - it provides backlighting for the screen and when that goes you have often no picture at all.

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