Question about LG 47LN5400 47" LED TV 1920x1080, 120 Hz. HDTV
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Posted on Jan 02, 2017
Hi; Look into Your owners manual for troubleshooting codes. If You dont have a manual call or google the manufacturer...alpharome416
Posted on Jan 22, 2010
A flashing light, with a black screen usually indicates one of about 4 things;
1) The videocard is not functioning correctly, or the cable is plugged into the secondary output on the card (if it has multiple).
2) The cable has become loose, damaged or completely disconnected
3) The monitor has died.
4) Your computer is not starting properly, causing a blank screen
1) Check the cable's connection on both ends, and inspect for any damage (kinks or tears etc.)
2) Take the monitor over to another machine and see a picture comes up. If it does, it's time to suspect the videocard, if not, the monitor is to blame.
3) If you're at this step, it's because the monitor works and the videocard most likely does not.
If you have a standalone card, try;
a) removing it
b) cleaning the gold leads with a white eraser and re-inserting it.
If you do not have a standalone card, or know what that is, move on to the next step.
4) If you're suspecting the videocard, standalone or not, it's time to;
a) remove the RAM from the computer
b) clean the gold leads with a white eraser until it shines and re-insert it
I suggest this because a defective RAM stick can cause a computer to fail to boot. You can also try unplugging all other peripherals, such as the DVD drive and hard drive to see if either of those are causing the computer to fail to boot. Obviously, without the hard drive, Windows won't run, but you'll have discovered that the issue could actually be with the hard drive (however it's unlikely).
5) If none of this worked, try turning the computer on without the RAM in. if there is no beep, your motherboard might have bit the dust.
Lastly, if you're uncomfortable with doing some of the more rigorous/complicated testing, please take the machine in to a professional.
Posted on Jul 01, 2010
SOURCE: How do i fix it
The logic board is faulty. That chip can't be replaced by normal soldering techniques. Replace the board. If you wish to get some details; visit the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Posted on Jul 11, 2015
SOURCE: I have a LG tv model number 47LN5400-UA. I have sound but no picture. Every once in awhile the picture will flash on then back off. If I hold a flashlight to the screen I can see some of the picture
Fault at its main digital board. 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. Surf the site with patience. Pull up older posts.
In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
Posted on Jan 14, 2016
You need to verify the back light if working fine
Posted on Oct 19, 2016
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