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LG FLAT SCREEN Model no: 42LN5100-TA has sound but no screen remain black, I have unplugged HDMI and all cables for 5 minutes but screen still black ?

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  • Expert
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You have a back lighting problem. Take the the back off, and do the flashlight test, to see if there is a picture. If you see a picture then it's a LED problem, ( there like Christmas tree light one go out they all go out ) or, it also could be a bad power supply board. I suggest a new power supply board, to see if that solves the problem. If you still have the same problem then you know it's a bad LED light strip.

Posted on Jul 11, 2019

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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://homenol.blogspot.com/
http://electronicshelponline.blogspot.com/
http://electro-medical.blogspot.com/
For 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.
Search the site by type in the "brand name" of your device; [Exclude the model number], in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.
{View the site in web view or by a desktop to see the search box. Mobile view has no search box.}

Posted on Jul 11, 2019

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6 Suggested Answers

6ya6ya

6ya staff

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SOURCE:

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Posted on Jan 02, 2017

Anonymous

SOURCE: TV screen went black, sound OK

check cold solder vertical circuit

Posted on Feb 19, 2007

Anonymous

  • 2 Answers

SOURCE: goodmans flat screen TV.Blank screen

If it is a LCD TV, and there is a faint picture, it is probably the backlight or inverter board (probably the latter). This is a common problem (especially with PC monitors).
Do an internet search for your model and inverter, you may be able to replace it.
Make SURE you REMOVE the power lead before opening the set !!!!

Posted on Mar 03, 2008

RescueTechLA

RescueTechLA

  • 2653 Answers

SOURCE: about 5 - 10 minutes into gaming, the screen will

No, cables RARELY go bad. More than likely it's the GPU on the motherboard. It's getting too hot.

You need to get some compressed air and blow out all the dust. It's best to do it outside ;)

Also give it about a minute or two before powering up again.

It also helps to use the PS3 in a vertical position, heat is your enemy!

Let me know what happens after following my suggestions.

--RescueTechLA

Posted on Nov 28, 2009

Chi Chu

  • 8457 Answers

SOURCE: screen went black...audio still working..Shuts off

Ur LCD inverter backlight board is dead.Replaced this LCD inverter backlight board.U will get ur picture back.Tries websites Shopjimmy.com,Ebay.com to buy a refurbish LCD inverter backlight board for the replacement.It a long board in shape.

Posted on Mar 15, 2010

SOURCE: screen and sound cut out while watching TV

http://online.manualspace.com/television-manuals-free-ebook/lg-television-service-manual/5319/lg-32lx4dc-lcd-television-service-manual-168.html
Above is a service and repair manual, use this to troubleshoot your unit.

Posted on May 11, 2010

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I have a black screen when I connect the HDMI cable. When I connected it originally it worked for about 5 minutes but now I get nothing but the black screen. I tried connecting a different HDMI cable to it...


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This seemed to happen right after I got my new Comcast box, which came with an HDMI 1.3 cable. I read somewhere online that this tv might not be compatible with that cable, so I unplugged it and am using component cables again. I just did this today, so I don't know if it will work, but so far the tv has been on for 30 minutes with no problems.

I'm pretty ignorant about HDMI compared to component cables. I imagine I will not get as good a picture with the component cables, but I am willing to sacrifice quality if I can just get the darn thing to work. Mine is also only 18 months old.

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