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My LG tv model number 42LN5400-UA no picture

When i watched tv and video games my screen would go black so i took a flashlight and went across screen and could see picture. the tv has sounds but there is no led lights visible behind tv.

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  • LG Expert
  • 264 Answers

It is a common problem for the LG 42/47 LN series LED TV, the problem is defective LED back lights strip (strips).

You have to open the display panel to find the bad one & replace it. The part number usually is printed on the strips, read 6916L-11XXA, you may purchase it from EBay.

Posted on Aug 11, 2017

Testimonial: "Thank You. This seems to be the right solution. I will look into this."

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Posted on Jan 02, 2017

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SOURCE: power led blinks but no picture or sound

Had the same problem myself. Took some doing but I managed to find a service bulletin that I downloaded. The problem is with the siene module and all you need to do is unplug connector JP63A from the main board and your TV will work again.
Take the back off the TV (there are a lot of screws) and look on the left hand side of the main circuit board that is mounted in the center of the TV. You will see a small white connector that is labelled JP63A, simply unplug it. Plug the TV back in and let it reboot. That's it, should be able to watch immediately.

Posted on Mar 15, 2009

  • 34 Answers

SOURCE: lg 42inch plasma

Sounds like main board failure and or power board failure. You need to contact manufacturer and describe problem for tech support. Some of the parts in Samsung TVs have lifetime warranties. Change out of two board is about an hour job and service call is usually comped. Hope this helps. J

Posted on Apr 09, 2009

xptareq2000
  • 1447 Answers

SOURCE: lost picture on my LG 42" plasma model number 42PC1DV

it is problem high voltage unite problem (EHT) change it then solve your problem

Posted on Sep 03, 2009

  • 1039 Answers

SOURCE: Hitachi plasma screen black. blue light on... no picture though.

Replace digital board. Common for this set.

Posted on Nov 09, 2009

budmrtn
  • 11361 Answers

SOURCE: I have a 1 year old sanyo 42" lcd tv, model

You need to find out if the power supply is putting out 24vdc for the backlight inverter board, it can be that the inverter board has short circuits which will cause the 24vdc to go into shutdown to protect itself, you can disconnect the power cables to the inverter board to see if you will get the 24vdc back.

Posted on Aug 17, 2010

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Take the screen off connect power and watch LEDs if any don't flash its LEDs only needed to change faulty strip if they all flash its probably t con boards.

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LG 42LN5400-UA.BUSYLHR back lights not working, sound working, flashlight test shows video working.


This is a common problem for LG 42LN5xxx & 47LN5xxx LED TVs, the problem is defective LED back lights strips, it has nothing to do with main power supply & the main board.
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My LG tv (Model number: 32LS3410-UB) has sound, but no picture. When I do the flashlight test I can see a very dark image on the screen. Will replacing the LED driver fix this problem?


If you already tested with the flashlight which is the first step in the blank screen with sound fault then you have to test the LED Backlight supply voltages if you are familiar and good in the electronic repair. First you have to check if bulging capacitors for the LED Backlight drive voltage circuit, replace them. If capacitors are good then you have check the backlight LEDs. The flashlight test proves that the power supply is good and TV is working fine because the sound is ok and picture is fine. Attached videos and links may help you for the repair and replacement of backlight LED strips or LEDs itself depending on the type of LED strips used in your model.
https://www.youtube.com/watch?v=Z1DEkSguWtg
https://www.youtube.com/watch?v=YgaL6X6eSaU
https://www.youtube.com/watch?v=EZVQKEp6jxk
https://www.youtube.com/watch?v=T2FboV-1PJg
https://www.youtube.com/watch?v=2pyuXwNkBMA






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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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1 Answer

Why does my TV have no picture but still have sound? Its a LG LED Tv Model number 42LS3400-UA prod code 42LS3400-UA.APHLJD Serial number 2101NBSB2837 When turned on there is sound but no picture.


the picture board has gone faulty
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if you have the number from the board you want to replace try e-bay --circuit boards for your tv and see what comes up

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Check and replace the damaged CCFL lamps at the back-light section. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
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