Question about LG 47LN5400 47" LED TV 1920x1080, 120 Hz. HDTV

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My LG 47LN5400-UA flatscreen has a black screen, everything works fine except black screen, when I shine flashlight on screen I can see full color picture, I have replaced the power supply/LED board.

When I power on the LEDs light up then go out, I have sound and all other functions except black screen

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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://electro-medical.blogspot.com/
To 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

Posted on Mar 14, 2016

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Posted on Jan 02, 2017

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Not Solved 9/17/18 A 9 yr old 55 LG LCD tv I need help with. Model 55LH55-UA w/ black screen exhibiting the following: -turning on tv by remote or on the side, blue ON light comes on, screen is black.


Sounds like you have LED backlights that are going bad and the strips need replacing, its not a real easy job but if you watch some youtube vids they show how to do it.

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I have a LG TV Model number 47LN5400-UA. I turn on the TV and there is audio but the screen is black. If you look closely you can barely see the image. What part do I need to fix it?


It is your back light or the power to the back light that needs to be changed as to how much and how easy it is to change will depend on if you do it yourself or have a TV repair person do it.

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Ive got a LG 55" LED tv model #55LA6200 it will turn on and show the LG screen then goes black after a few seconds. Audio works and i can see the screen with flashlight which part do i need.


This could be the power supply at 55 dollars or the LED back light strips that are about 80. Unless you know how to test them, it is a toss up. Most of the time it is the led strips though. http://www.shopjimmy.com/lg/55la6200-ua

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LG 47LN5400-UA LED picture has gone out. Audio works. Using flashlight I can see faint menu image. LED Driver or LED Strips? How can I tell?


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://electro-medical.blogspot.com/ To 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..

Dec 23, 2016 | LG 47LN5400 47" LED TV 1920x1080, 120 Hz....

1 Answer

LG 47LN5400 UA no backlight, but can see menu using the flashlight test.


Contact LG Edward at 800 243 0000. Thank you and leave feedback

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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.
http://electro-medical.blogspot.com/
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.

Jan 14, 2016 | LG Televison & Video

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Which part needs replacing on the TV? See details.


Fault to the main power supply regulator section. Either it will be on a separate board, or on the part of its main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/

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probably not the phone has a sensor in it to detect moisture thus no warranty unless it had insurance. good luck

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