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Elliott Barton Posted on Dec 30, 2018
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My LG 47LN5400 does flickers and turns off when using an external AV source, how do I fix?

The TV flickers and then loses power when an AV source is connected such as HDMI, USB etc. The USB is fine until a video file is played. I have updated the firmware with the latest and the problem still continues. Any suggestions?

1 Answer

Ron Reynolds

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  • Posted on Jan 15, 2019
Ron Reynolds
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If it only happens when another source is connected, it's probably a bad port. The only recourse is to change the board.

5 Related Answers

Anonymous

  • 482 Answers
  • Posted on Dec 18, 2007

SOURCE: won`t play or record

take it back and get a new one. Make sure you scan for a virus i use the free AVG

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Anonymous

  • 1 Answer
  • Posted on Feb 02, 2009

SOURCE: when sony blu-ray plays, lg 52lg70 tv power turns off and on

Try using a different HDMI cable; one that is not simplay or 1.3.
The HDMI can control functions of the TV.
If you get a cheaper cable it may not do this.

John Riley

  • 441 Answers
  • Posted on Jul 15, 2009

SOURCE: LG HT502 wont recognize hdmi cable. it says hdmi

go into the video setup menu, and select HDMI set up and select "ON" that should do it

Anonymous

  • 635 Answers
  • Posted on Mar 09, 2010

SOURCE: Acer AX1700-U3700A with variable Audio on HDMI

Your problem isnt in your PC, it's because you chose the onboard sound to listen to music etc, which is normal. Unfortunately, you need to choose the HDMI Audio output if you want sound on your TV FROM the HDMI cable. Right click the sound icon located to the lower right side of your screen and choose (adjust audio properties). Now go to the audio tab and click the output device window and choose your HDMI audio output, whatever it may be called. Just pick the one that wasn't selected when you opened it and click ok or apply. Now all audio output is controlled by your Video card lol. Crazy aint it?

Anonymous

  • 4 Answers
  • Posted on Dec 31, 2010

SOURCE: Hi, my lg bd370 will

I had the problem with this player and disc where the audio worked for the previews but once the film started it got jittery and the sound went in and out. I went to the audio set-up and switched it from 7.1 to 5.1 and the problem was immediately solved. Is this the problem you have? I surfed around and a lot of people have experienced this problem with Toy Story 3 and this particular player.

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LG 47LN5400 TV Repair

It could be either main or power board issues
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LG 47LN5400 FLAT SCREEN SOUND BUT NO PICTURE, BUT YOU CAN SEE SHADOWS OF PIC IN THE BACKGRND. MAIN BOARD REPLACMENT? CAN I DO IT MYSELF

Yes you can do-it-yourself its sounds like the Back light led's in the back of the flat screen are not getting power. it could be 1 of 2 boards inside the chassis of the TV look online and put that model number in when you look.
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Not Solved 9/17/18 A 9 yr old 55 LG LCD tv I need help with. Model 55LH55-UA w/ black screen exhibiting the following: -turning on tv by remote or on the side, blue ON light comes on, screen is black.

Sounds like you have LED backlights that are going bad and the strips need replacing, its not a real easy job but if you watch some youtube vids they show how to do it.
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My TV is a LG 47LN5700-UH I had a lightning strike near the house. Afterward TV would start but not boot completely. Now it won't start at all. Cable box also got fried at the same time.

The led driver AND the T-con board are bad. If you could see a picture with the flashlight then the T-con board would be good. It is not. The led driver can be on the main board or the power supply board. You can get these parts from here: TV Parts Universal TV Stands DLP Chips ShopJimmy
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I have a LG TV Model number 47LN5400-UA. I turn on the TV and there is audio but the screen is black. If you look closely you can barely see the image. What part do I need to fix it?

It is your back light or the power to the back light that needs to be changed as to how much and how easy it is to change will depend on if you do it yourself or have a TV repair person do it.
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LG 47LN5400 blank screen after brief flash

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.
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Which part needs replacing on the TV? See details.

Fault to the main power supply regulator section. Either it will be on a separate board, or on the part of its main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. 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/
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My 32inch lcd tv keeps flickering it started all the sudden

TRY THIS

    • 1 Turn the TV off with the front-mounted power button, not the remote. Unplug the TV's power cord from the wall outlet. Let an hour pass before plugging the cord back into the wall outlet. Turn the TV back on with the front-mounted power button and wait until it has fully restarted. Bring up a TV channel to see if the image being presented on the LCD screen is no longer flickering. A momentary power surge can cause the circuitry inside the LG-brand LCD TV to function erratically.
    • 2 Unplug the video cable from the video connection on the back or side panel of the LG TV. If more than one video cable is connected to the TV, disconnect all of them. Disconnect the other end of the video cable from the video source device that it's attached to -- a DVD or Blu-ray player, or a satellite receiver or cable box. Blow off the connections on the video source device and on the back or side panel of the TV with bursts of compressed air. Reinsert one end of the video cable into the video source device and the other end into the video input that it was connected to. Turn the TV back on with is remote to see if the picture is now free of flickering. A loose or partially connected video cable can cause the LCD TV's screen to flicker when presenting an image.
    • 3 Turn the TV off and unplug its power cord from the wall outlet. Place a power conditioner next to the wall outlet. Plug the power conditioner's power cord into the wall outlet. Plug the TV's power cord into one of the AC sockets on the power conditioner. Turn the power conditioner on. Turn the TV on to see if the picture is now free of flickering. The RF signals in the electric line that the LG TV is drawing power from can cause flicking through interference patterns being generated.
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