Question about LG Televison & Video

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I would like to confirm which part to replace if possible. Screen is black when unit is on, but content only visible with flashlight. Audio is ok. More info below in the details box. Thanks!

LG LED Model 47LN5750-UH Would like to know what part to try and replace. *Flashlight needed to view video (screen remains dark) *Audio ok *LG logo "flashes" very briefly on screen when tv is turned on, but after which nothing is visible without a flashlight. * No LED visible with back cover removed.

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If you have good knowledge of repairing electronic equipment then check back light voltage in the power supply, if it is normal then you have to test the LED back light with external power. If it doesn't glow, dismantle LCD panel and follow the instructions how to check LEDs according to these links: https://how-to-repair.org/repair/lg-tv-repair-manual-pdf/lg-led-tv-no-backlights-32ln5300-32ln5310-32ln5700-voltage-test-troub/2pyuXwNkBMA.html Lg Led Tv No Backlights 32ln5300 32ln5310 32ln5700 Voltage Test Troub Lg... and https://www.youtube.com/watch?v=_poWTEihIJU Fix Led Backlights for TV or Monitor

Posted on Apr 04, 2017

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The backlight is not working. Either power supply or led's

Posted on Jan 06, 2017

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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.

Sep 16, 2018 | LG Televison & Video

1 Answer

What voltages and at what points should I be testing to narrow down the problem, or what other problem-solving technique should I be testing?


First question, what do you mean by replaced the LCD's...LCD's would be the panel itself and I know you didn't replace that as you can't get one for under several hundred dollars, more than the cost of the set new in most cases. In your 1st sentence you said I have a LG 50 LCD TV Model: 50LN5700-UH...your tv is a LED set.

Mar 16, 2018 | LG Televison & Video

1 Answer

TV has sound but no picture


The Audio and Video are two separate components and operate independently of each other. Therefore: The Video portion requires technical repair by a technician with the proper test equipment.

Jan 31, 2018 | Televison & Video

1 Answer

I watched the video for replacing the tcon card on the 60in model. Is it the same procedure on the 50in?


yes the procedure will invariably be the same.
but the part number will certainly vary.

Jun 26, 2016 | Televison & Video

1 Answer

LG 47LN5750 TV has no back light issue-


replace screen it's faulty period ensure it comes with T-con

Oct 03, 2015 | LG 47LN5750 47" LED TV 1920x1080, 120 Hz,...

1 Answer

Unit starts ok then any where from 30 sec to 1 minute the screen goes black.power light good. opened unit capacitors good .if u put a flashlight by it u see the image. Is it hard to cnange the backlight...


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

Apr 15, 2011 | Acer P191WBD LCD Monitor

1 Answer

Don't know what to do !


connect external monitor to see if adapter is ok. If external monitor comes on OK,(check to see if the FN+F5 or another key has to be toggled for external display) then shine flashlight on screen to see if Icons are visible. If the Icons are visible LCD inverter would have to be replaced. If external monitor works and Icons are not visible lcd is probably no good, If external monitor does not work then Video adapter is bad.

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