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LG 50LN5700-UH - Sound, but No Picture Intermittenly    
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nuwrldmn



Joined: 07 Oct 2016
Posts: 4
Location: North Carolina

PostPosted: Fri Oct 07, 2016 3:11 pm    Post subject: LG 50LN5700-UH - Sound, but No Picture Intermittenly Reply with quote

Hello All- This LG 50LN5700-UH is 3 years old. A few months ago, noticed a dark cloudy spot in the left top section of the display when there is a light screen. The other day, tried turning on TV, sound came on and no image. I did a flashlight test and noticed there was an image, but backlights were off.

Took off the rear cover and powered up and saw all backlights illuminate. Checked the image and it was visible. Sound and Image was there (with dark spot still). I checked all wiring and everything seemed tight and the image stayed on while shaking and moving different items on the T-Con board, main board, and power supply board.

Put cover back on, had TV working for about 90 mins and then image failed again. I notice when I change channels sometimes, the image pops on for a second then stays off.

If everything seems to be tight, any other thoughts on what would cause this intermittent display issue?

Thanks to all in advance.
Google

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JTS1957



Joined: 21 Jan 2009
Posts: 2247
Location: Far, Far Away

PostPosted: Fri Oct 07, 2016 7:58 pm    Post subject: Reply with quote

nuwrldmn wrote:
Took off the rear cover and powered up and saw all backlights illuminate.


You have to at least partially disassemble the PANEL, (after taking off the rear cover, of course), to observe whether each and every LED illuminates.

IF the set stays on for a period of time, go into the customer menu and decrease the Backlight Intensity. It's quite likely been at 100% (Maximum) since it came out of the box.
nuwrldmn



Joined: 07 Oct 2016
Posts: 4
Location: North Carolina

PostPosted: Fri Oct 07, 2016 9:54 pm    Post subject: Reply with quote

Thanks for the reply. You are correct about the backlight intensity. It was at 100% when I had the video working and I lowered it down to 20%. The unit still stopped displaying video.

So, what went wrong with this set? With the backlight down lower and still not working, how do I fix this?

Thanks.
JTS1957



Joined: 21 Jan 2009
Posts: 2247
Location: Far, Far Away

PostPosted: Fri Oct 07, 2016 10:30 pm    Post subject: Reply with quote

Link in previous post. Be sure everything matches YOUR set.

Do some research(search button IN upper right corner): "lg led back" ("samsung led back") - recent results should cover majority - IF you still have questions ...
nuwrldmn



Joined: 07 Oct 2016
Posts: 4
Location: North Carolina

PostPosted: Tue Oct 11, 2016 5:45 am    Post subject: Reply with quote

Thanks for the assistance. I will order the LED strips and double sided tape. Luckily, there is also a video on YouTube for changing these out on this exact model, so I will have a good guide to follow. ~$65 is really not much of a cost if it brings this set back to life.

Again, thanks for your input with this issue.
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nuwrldmn



Joined: 07 Oct 2016
Posts: 4
Location: North Carolina

PostPosted: Mon Nov 28, 2016 9:10 am    Post subject: Cannot Find LED Strips Reply with quote

Hey JTS- Thanks again for your guidance. I have my TV completely apart and simply need to find replacement LED strips. ShopJimmy has been out for months. I see used parts on eBay that were pulled from old TVs. Any idea where I can get a full set of replacement strips for this LG 50LN-5700-UH?
JTS1957



Joined: 21 Jan 2009
Posts: 2247
Location: Far, Far Away

PostPosted: Mon Nov 28, 2016 10:08 am    Post subject: Reply with quote

30 seconds of research found:
HERE
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