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I need advice on LED TV repair I have a LG 50ln5600 TV that has quit working and I would like to know if it is worth fixing.

TV= LG 50ln5600ui; symptoms=sound is good, no back light, image can be seen using flashlight. At start up, back lights flash and then go off. Same at shut down. Voltage reading at power board are within specs(3.4,3.4,0,24,0,12,12,0). Voltage at LED connecter settles at 76 and 76--it starts at 132. When this problem first appeared, the TV was turned off and upon restarting, it worked fine for several days but now its permanent. What is the problem/solution?

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  • 11 Answers

LG has been having problems with the panels LEDs going bad. To get to them the panel must be disassembled by removing the screen and defusers, usually 3 of them. Make sure you reassemble exactly as you disassembled. After removing the screen and defusers, you can now power the set on and see which LEDs are not lighting. Gotta have a quick eye. You can usually locate a replacment LED strip on E-bay. This is not an easy repair. I charge $200.00 to do them. Hope this helps. :)

Posted on Apr 29, 2017

  • intocars Apr 29, 2017

    I was hoping that this was not the answer since the set did work for awhile after this problem first appeared and the voltage to the LED's seems reasonable. Thanks.

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I have a Lg 50ln5600-UI flat-screen tv that turns on but I can't the see any thing on the tv unless I point a flashlight at the screen. What could this be?


Hello Dararius,
When you shine the flashlight at or near the screen and see the images, it means that the LEDS located behind the screen are not working. Since LED's don't usually blow out, it means that the LED driver circuitry located on a pc board inside the set is blown out and either needs to be repaired or just buy a new pc board from ebay such as the following:
http://www.ebay.com/itm/LG-EBT62679606-EAX64872104-1-0-Main-Board-for-50LN5600-UI-/361039485726?hash=item540fa15b1e:g:MBcAAOSwSdZWe5E0

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1 Answer

My 32 lg led TV backlight problem. back light voltage is 2 volt. pls help me


Is it 2 volts ac or dc?
If you don't know what you're doing, don't open it up like this!
There can be 500 or more volts on some of these capacitors, even with the TV unplugged! THAT IS HAZARDOUS LEVEL!!!
You only have 120 or 240 coming out of an outlet and that can kill you!
Even TV repair people just replace the whole board because it's not worth the time to fix one component to find out when it went it destroyed something else. Since you obviously don't know this, you don't know what you're doing and should leave this to experts! (that know how to be safe working with high voltages)

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1 Answer

Screen went dark but can see picture in dark room with flashlight


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/
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.

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1 Answer

I have a LG 50LN5600 LED Smart TV w/sound no/pic Have replaced the power supply board and t-con board. Main board only one left and research says that this would not be a main board prob. Any help?


If the LCD panel back light is not lit you have a bad LCD panel. If the back light stays lit when the set is turned on then you almost certainly have a bad main board since you have already replaced the power supply and T-con.

Aug 17, 2015 | LG Televison & Video

1 Answer

Tv has sound, but no picture,


Hi Tom,
It appears to be a back light failure. Please see that the back lights are receiving the power they need.
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Lg 50ln5600 backlight issue


Check whether the back-light start voltage [control voltage] comes to the backlight inverter section of the power board; from the main board. It sounds that that voltage does not come from the main board, after the firmware has been loaded up. If so the main board will have the fault. Contact any service technician.

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