Question about LG Televison & Video

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I have a LG LCD smart TV model 50LN5700-UH that has a very dark screen. I removed the back cover and when I turn the TV on or off the LED's will flash on briefly. The volume on the TV is good. Any help with this issue would be great

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  • Patrick Carney
    Patrick Carney Mar 29, 2015

    I had the same exact issue. I called LG and they were awesome. I still owed $250.00, the year warranty was up . So they extended my warranty 30 more days, set me up with a tech, he came two days later, looked at the tv, then said he would be back when the part comes in. two days later , he came back and installed the modular. (Screen). Now I have a good as new tv. Thank you LG!!

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  • LG Master
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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/
In some models of LCD TVS; the backlight inverter and its T'Con board will be a part of the panel itself, and will be a built-in type inside the LCD panel. If so, they can't be replaced. In this case; a panel replacement is the only repair. For some other models, the backlight inverter section circuit will be a part of the main power supply regulator [SMPS]. To such sets, the power supply section circuit too should be troubles hooted. Contact any service technician. The circuit will differ with models and versions.
Type in the brand name of your device, in the search box [at the top right] of the display window and the Search will start at once as you type in, and will show you all the related posts. It will make surf easy.

Posted on Mar 30, 2015

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  • Contributor
  • 7 Answers

I'm not sure if it's the same for LG but my Sharp had a similar problem, the "main"board went bad. Cost me $150 to replace myself, repair shop wanted $500. It's like the motherboard in a computer but much easier to replace, just screws and connectors to deal with.
That was 3 years ago and it's still working fine.

I found your "Main Digital Board" for only $75!

Posted on Jan 12, 2015

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  • LG Master
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It can be backlight lamps, CCFLs.

Posted on Mar 30, 2015

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Posted on Jan 02, 2017

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1 Answer

Lg model 50ln5700-uh black screen


When you tunr on the switch ,can you see the power light ?If no power light ,I think your tv power board is dead.
you can have a look this website:www.abctay.com,they sell tv power board

Jul 10, 2018 | LG Televison & Video

1 Answer

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?


First question, what do you mean by replaced the LCD's...LCD's would be the panel itself and I know you didn't replace that as you can't get one for under several hundred dollars, more than the cost of the set new in most cases. In your 1st sentence you said I have a LG 50 LCD TV Model: 50LN5700-UH...your tv is a LED set.

Mar 16, 2018 | LG Televison & Video

1 Answer

On an LG TV model # 50LN5700 UH , is the backlight inverter part of the power supply board?


Yes it is, this is a LED TV so there isn't an inverter board, they're only used on LCD sets...don't you have backlights but can see an image with a flashlight?

Jan 21, 2018 | LG Televison & Video

1 Answer

I have an LG 50" Smart LED TV (model # 50LN5700-UH). I have a black screen with sound. The picture flashes up momentarily when it powers on. The back lights flash on momentarily when it powers on. You can...


You are on the right track -led's are pretty durable items and I would try the inverter board first since it supplies the juice for the panels to work and is a source of issues.

Aug 19, 2017 | LG Televison & Video

1 Answer

LG 50ln5700-uh led tv, sound no picture


Fault at its main digital board. No back-light inverter start voltage comes from it to the back-light inverter circuit. 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. 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.

Feb 14, 2017 | LG Televison & Video

2 Answers

My tv image goes off while watching tv,I do have audio but no image.


LG 42LS5700 - LG.com

www.lg.com > Home > Support > Product Support

LG ElectronicsTV/Audio/Video; TVs; 42LS5700 ... TV Support Landing Page - HDTV/Netcast/webOS 1.0/webOS 2.0 ... Adjusting Picture Settings - webOS 2.0 Video ... quality and convenience of complimentary shipping when buying directly from LG.com. ... Curved TVs · 22 Inch to 29 Inch Class TVs · 32 Inch to 39 Inch Class TVs · 40 Inch ...

Amazon.com: Customer Reviews: LG 42LS5700 42-Inch ...

www.amazon.com/LG-42LS5700-42-Inch.../B006ZH...

Amazon.com, Inc.LG 42LS5700 42-Inch 1080p 120Hz LED-LCD HDTV with Smart TV (2012 Model). byLG. Size: 42-Inch ..... images are nice and crisp when viewing HD content.

Widescreen TV Black Screen - Repair LCD LED PLASMA ...

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https://www.youtube.com/watch?v=RbZncfiOXQA
Jul 13, 2011 - Uploaded by FixItUrselfDummy
Fix your tv with black screen blinking light, popping sound noise. ... Watch QueueQueue ... TV Black Screen - Repair LCD LED PLASMA - Problems SONY LG .... I have a 60 inch samsung DPL tv how can I stop the humming or ... What do I do if my tvturns on but its just a black screen so sound no picture?.

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1 Answer

50LN5700-UH. How do I replace backlight board?


If the back-light inverter board is an external one, you can replace it. To some LCD TVs; especially to LED LCD TVs; the back-light fittings will be an integral part of the panel. if so, replace the display panel will be the only solution. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/

Oct 28, 2015 | LG Televison & Video

1 Answer

How to removed back panel?


If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Disassemble procedure to many popular brand TVs are given with illustrations.

May 15, 2015 | LG REFURBISHED 50IN 50LN5700 FUHD 1080P...

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