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LG 50lb5800 TV, led backlight flashing on/off, picture/menu both work. Any ideas what it is?

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In most of the case, one or more LED back lights diode is bad, it is a common problem for LG TV 2011 to 2015 models.

Posted on May 04, 2017


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Posted on Jan 02, 2017


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Samsung TV (model UN40H6203AF) 40" LED. No picture, have sound. Flashlight test can see faint menu screen. Have replaced power supply & main boards to this point. Ideas as to what to do next?

Hi Terry,

If you can see the faint picture in flash light means the power supply and the main board is working. The real culprit is the backlight. Even one bad LED in the backlight will switch off the whole array. To repair this fault the panel has to be opened and the defective LED or LEDs are to be replaced.

This is a complicated, delicate and risky job and must be attempted by an expert only. You may end up damaging the screen permanently if you have not done it before and try to DIY.

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Black Screen on LG LED TV. From what I can see, I have not backlight, but I have sound and I can see the picture with a flashlight...TV flashes on start up. Is the LED panel or the T-conn board ??.

LED backlight of your TV might gone. If you are a good service technician and know about electronic repair, check LED Driver voltage, if voltages are normal then you can test your LED backlight by applying external voltage to the LED backlight to reconfirm. Link to download Service Manual: LGE 47LV4400 Service Manual R01 1

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LED tv LG 50LN5200 with no picture but has sound

Faulty the backlight
It is necessary to remove the panel and replace defective LEDs

Best Regards!

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Should an LED t con board make a light buzzing noise?

Hi Anonymous,
It looks to be a case of failed backlights.

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LG 50ln5200-ub led TV . Has no picture but great sound . What is the problem ? I did the flashlight test and can see the faint picture which tells me the backlighting is out . This tv model is a Black...

usually bad power supply, Where did you source your part? return/exchange it. Bad LEDs/ possible but not as likely, Tcon working if you can see images with flashlight. You must also have backlight on signal from main board ,check for 3 to 5v on labeled connecter on power supply. UPDATE---47" & 50" LN series. This model has had LED problems if your TV acts as described by Mr. Hughes in is answer to this problem you have bad LEDs

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1 Answer

Samsung monitor 2232bw plus backlight fade in black backgrounds scenes

Most common failures in these LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply C242 470uF 10V, C241 & C242 1000uF 16V, C261 & C319 680uF 35V failed as indicated in the attached picture, replace them at once.

If the power supply board is working then it is back light problem, first do a flash light test. If you can see the image in the flash light test, follow the steps how to test back light voltages: and follow the steps how to repair back light LEDs: Fix Led Backlights for TV or Monitor Lg Led Tv No Backlights 32ln5300 32ln5310 32ln5700 Voltage Test Troub Lg... Fix Led Backlights for TV or Monitor

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I have a LG 50 LCD TV Model: 50LN5700-UH that has a black screen. There are a couple of things I have tested and replaced. First off there is audio but just a black screen. I turned off the lights and looked for signs of back lights. When I did this there were no visible signs of lights. In addition, I did the flashlight test. Which showed visible signs of lettering on the screen with the flashlight. Which if I understand correctly it may determine that the T-Con board is functional. I ordered additional LCD's from Shop Jimmy and replaced the bad sticks. About half were replaced. I reassembled the TV and I am still getting no video, but I still have audio. However, this time all the LCD's are functioning so now the screen is still more grey than black because of the working LCD's I replaced. What voltages and at what points should I be testing to narrow down the problem, or what other problem-solving technique should I be testing? One other thing I should mention is there no visible signs of swollen capacitors or any signs of burn marks. I am 99% sure I connected all of the cabling up correctly, not 100% since this was my first attempt but I am a little less confident I put the filters in the correct way. I had the TV disassembled while I was waiting on the LCD's to ship and when I re-assembled I was less confident if I picked up all 3 or 4 filters and set them down, or if I make have flipped the filters to keep the circuit board on the front cover from being damaged. Hope that make since.

Mar 16, 2018 | LG Televison & Video

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