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LED TV pulsing

I have a LG TV...50LN5400-UA. I've had to change an LED strip, replaced the main board, replaced the LED/Power board and the T-Con board, but the image still pulses it looks like its has a heartbeat...it fades in really fast then out really fast...does that make sense?

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  • Jerry Reece
    Jerry Reece May 25, 2016

    No standby light either

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How many have 'blinking' issue with Samsung led tv - Forums - CNET

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My LG TV Model # 47LW6500-UA powers on (based on standby light turning from red to white), but screen is black, no sound, and negative flashlight test. Which part is most likely needing replacement? Main...


Going to need more information to help much, what do the various power board rails look like?...are they all good?

Going by the fact this set has had a lot of main board failures I'd lean towards that board but its just a guess without knowing some voltage measurements

Mar 11, 2018 | LG Televison & Video

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Lg tv blink codes


Take the screen off connect power and watch LEDs if any don't flash its LEDs only needed to change faulty strip if they all flash its probably t con boards.

Oct 28, 2017 | LG Televison & Video

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My LG 50LN5400-UA.When I turn it on there is a flash, then the screen goes dark. The sound works.With a flashlight u can see the picture. I can't see any backlights.I replaced the powerboard.


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://electro-medical.blogspot.com/
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.

Apr 12, 2017 | LG 50LN5400 50" LED TV 1920x1080, 120 Hz,...

1 Answer

Tv has sound no picture.when you point a flash light at screen you can see picture I think it's a led driver board that needs to be replaced LG 50 inch tv 50LN5400-UA ????


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://electro-medical.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...

Nov 30, 2016 | LG Televison & Video

1 Answer

I have a lg led tv model 50ln5400-ua no picture but sound on. Before it died it had a little darkness spot in the screen.


Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
Before going further; try a hard reset first. If it does not help you, replace the main digital board. 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; visit the site linked here. ..

May 09, 2016 | LG 50" 5400 Series LED HDTV - 50LN5400

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