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I have a LG TV 47LB5900-UV, which is about 1.5 years old and the screen suddenly started flickering on an off. I was watching TV on it and suddenly the display just went off, the flashed on then back off. At this point the display is primarily off, but flashes on for half a second, then back off. This is happening with the initial screen, on screen menu, and with any input. I opened the back and reseated the internal cables between the 3 boards, but the issue remains. The connectors on each cable are somewhat recessed, so I am not sure of a good way to clean them. The TV doesn’t seem to be completely powering on and off, just the screen is flashing on/off. Whatever is would normally be displayed is just flashing on briefly until I turn the TV off. Please advise how to test and further isolate to which component should be replaced. Tcon? Power board? Main board? Cable?

Replace all led strips…had same problem…R & R’d all boards ( psb, t-com, and vid board)…..same problem. End result…Bad led strip, since they age at similar rate, replace ALL! delicate job….Or part the LG TV out and buy anything but LG….Mine failed 1 month past the warranty….evidently a common LG TV problem (after reviewing LG flicker problem)!!

Lol i had the same or similar symptoms. After a few weeks of freakimg out i was smart tv page with the live preview screen in the top left. And the preview screen blinked showed lines not the whole screen. That immediately made me realize the tv is perfectly fine. Its either my cable or computers graphics card. So my tip for all you fellas is check to see if the flickering still happens when your in a tv menu or smart home page.

Hi You will find that a few of the leds have blown and taken out the power board , you will need a new PCB and new leds mines had exactly the same problem after two years running, i put it in the bin to save a lot of heartache cause if you get it repaired it will almost certainly happen again unless you can turn the backlights down , incidentally out of all the lcd televisions i have had its only the lg smart tv that has let me down after such a short time

It sounds to me like you have a bad power supply board. Some component on it has gone bad either a cap, resistor, diode, or even a fuse. There are various components on the board that need to be tested. If you are familiar with soldering and desoldering, then go ahead and remove each piece and perform and ohm test as well as resistence test. Check relays as well. Most of the time one or more components on the HOT side of the board go bad. This can be time consuming so I find it easier to simply replace the entire board.

I had this problem and I found that an LED had caused the problem. Instead of replacing the single bad LED’s [there were two] I chose to replace the strips containing the bad ones. I will tell you if you decide to do this job yourself BE CAREFUL with the main screen if you crack it, might as well toss it, it will be cheaper to buy a new one. Hope this helps!

Easiest way to see if you have a backlight problem on your flickering tv is to shine a torch at the screen while pressing the volume button. If you can see a image on the screen then your backlights have failed.

The backlight inverter board might be broken. check where the backlight plugs in and try replacing that.

Yep..its board that powers the leds…or leds themself i had 65 inch samsung ended up wiring and sautering the not lit up strips to each working strip ..quick easy fix

this is the problem I’m having, any ideas?

https://youtu.be/2ppAUuvmkQU That’s my TV two years ago. I fixed it by replacing the led strips for~ $75

How to fix or rectify LG Smart TV Image flickering ? Like this video : https://www.youtube.com/watch?v=lXvpDTuG…

The new TV now a days have life span bet 3-5 years depending how often you are watching or using the TV. If the life is more than 5 years, good for you. TV Panel as well as electronics boards were not designed to work in a longer years. For any problem in Smart LCD/LED TV like no picture but with sound, solarize picture, no power at all, the stanby lit but not turning on, try to visit my youtube channel DASOL PAN and locate my Playlist How to fix TV. I have some english youtube blogger there that I subscribed. Otherwise try to seacrh on Youtube the problem you have. Just like this one, one of the common problems on LED/LCD TV today. Try to click the link to watch the video. Hope the video still available: No Picture with sound: https://www.youtube.com/watch?v=ejaRVrnD… If you can understand Tagalog Language, try to browse and watch my Youtube Channel Playlist (How to fix TV?). Dont forget to like the video that help your problem and if possible, SUBSCRIBE. https://www.youtube.com/watch?v=LAd_9a__…