Question about LG Computers & Internet

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Hello, i have an lg 42ln6138 but after a sec the screen goes black. When i use a flashlight i still can see the image. So i assume backlight problem.

Im looking for tutorials and links to get it repaired

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  • LG Master
  • 65,477 Answers

THEN USE GOOGLE AND SEARCH POSSIBLY WWW.YOUTUBE.COM

Posted on Oct 06, 2019

Testimonial: "Already did that, no real answer to this model"

  • ray gallant
    ray gallant Oct 06, 2019

    THEN I WILL SUGGEST A LOCAL REPAIR SERVICE

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6 Suggested Answers

6ya6ya

6ya staff

  • 2 Answers

SOURCE:

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

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Good luck!

Posted on Jan 02, 2017

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Ivan

  • 308 Answers

SOURCE: 20" lg LCD backlight turns off after about 5 seconds of use.

First, check the power supply for the backlight. It's usually a 24 volt supply. Look for swollen caps. If that is ok, go to the inverter board and inspect for damage, ohm out the inverter transformers. Last is to test out the lamps seperately with an external inverter. If a lamp goes out this way, it is bad and causing the whole backlight to go out.

Posted on Apr 14, 2010

AJIN G

Electro Med Services

  • 6694 Answers

SOURCE: Unit starts ok then any where from 30 sec to 1

hi,
Before going to replace CCFL check the inverter of the CCFL. Normally the inverter get faulty. There is possibility that the winding of the high voltage transformer get shorted or its driver transistor may get faulty. check the same
ok

Posted on Apr 15, 2011

Geekman

Chris Hingee

  • 32281 Answers

SOURCE: My HP DV4000 beeps when I press the power button and the screen will stay black.

This POST error code maybe -
one long, two short beeps

  • System board failure
  • Video adapter problem
  • LCD assembly failure

Posted on Dec 04, 2012

Testimonial: "I had already thought of that, but since I couldn't find any notebook beep code charts (there are plenty for desktops, instead) I asked for confirmation. This seems to be video card related. I think I'll just ditch this old notebook and get a new one. Thanks anyway."

AndrexT

Andrew Taylor

  • 29792 Answers

SOURCE: Screen black have sound see images with flashlight in darkened room, no backlights need to know problem

you need to take it to a repairer. The backlighting module in the set needs replacing.

Posted on Dec 16, 2015

jeff5may32

  • 1258 Answers

SOURCE: Have a LG Tv that has sound but no backlight, can see image with flashlight. When you first power on TV show white screen with LG logo then goes black. Tv is a 55LN5790-ULBUSULJR

Well, you've done the easy part. The unit has sound and picture, but no backlight. The next part is tedious and delicate: dismantle the unit and find the cause. Many times, the problem is cabling or wiring, but once in a while the problem is control related. if the unit is under warranty, have it serviced by an authorized service dealer. If not, it's up to you. The new, flat tv's are super easy to wreck once the case comes off, so unless you really know what you're doing, it is very easy to justify paying a competent professional to repair the unit.

Posted on Jul 29, 2016

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1 Answer

Lcd tv screen goes black after a few seconds but sound still plays. The flashlight test will show the image for a short period of time but then it goes away and is completely black.


Hello... It sounds like you have a backlight failure, and the image going away during the flashlight test is due to the TV going into "Protection" mode. A service technician may be able to go into the service menu and clear the lamp error codes and get the TV working, or it may need the backlights replaced. I hope this helps...

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It may be the internal backlight that is failing. You can take a flashlight and hold it close to the screen, move the flashlight all around the screen and check if you can see anything. The display will be dark, but you should be able to make out the image that is there with the flashlight technique. If you can see an image on-screen, then your backlight has failed and you will need to replace the monitor. Weather or not you see an image is not a critical issue, but a tool to verify if the backlight is off or some other issue is causing the problem.
Note, it may be difficult to detect an image on the un-light display, for example if you have a dark image as your desktop background. So make sure to fully scan your display (top to bottom, and left to right covering the entire screen) with the flashlight technique in order to see any image on-screen.

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20" lg LCD backlight turns off after about 5 seconds of use.


First, check the power supply for the backlight. It's usually a 24 volt supply. Look for swollen caps. If that is ok, go to the inverter board and inspect for damage, ohm out the inverter transformers. Last is to test out the lamps seperately with an external inverter. If a lamp goes out this way, it is bad and causing the whole backlight to go out.

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The l226wtq goes black


Try shining a flashlight on the screen, or without the flashlight, try to see if you can distinguish anything on the screen at all, if you do, the backlight is dead, or the monitor has an internal most likely unfixable problem.

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2 Answers

Screen goes black


Hai,
Do you see any dull image on the screen ?
If yes the inverter Card/Backlight of the screen is having problem.

Regards,
Aby

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