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LG42LN5700 flat screen TV. Why does it have a black screen?

Replaced the LEDs and power board which has the LED controller built-in. I do see a picture behind the black screen.

Posted by Kath M on


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  • LG Master
  • 2,325 Answers

There is a problem with backlight and your LCD screen too on your TV. Change the picture mode to Standard and then make sure that your backlight setting is at the lowest. Unplugged the power cord from your t.v and plugged it back in and see if that fixes the issue. It could be the fact that your TV has died on you and you should buy a new TV. The newer TV's seem to be not lasting as long like their CRT components do on the other hand.

Posted on Apr 22, 2021


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  • 138 Answers

SOURCE: 42PF5321D/37

Measure the connector from the logic board to the power supply the second pin from the left it will say Vs_ On if the set has 3.1 volts the problem is the SSB or the logic board. On the logic board there should be a solid led and a flashing led that shown that data id flowing and the problem is the SSB. The SSB is easy to replace just remember what you tokk loose and from where. You probely will save money that way. If the set is in warranty or just out of warranty contact Philips 1-888-744-5477 and see what they can do first.

Posted on Aug 20, 2008



  • 71 Answers

SOURCE: 42inch sanyo vizon flat screen tv bought 18 months

2000 $ ???

Posted on Mar 05, 2009


  • 57 Answers

SOURCE: Hoover Savvy U8174-900, replacement circuit board LED/Brush Motor

clear1x1.gif Hoover Switch & Circuit Board with Handle for Hoover Savy & Bagless

Follow this link to USAVACUUM.COM

Posted on Feb 21, 2010


  • 1 Answer

SOURCE: Clicking relay no picture no audio no power light red or blue

here is the schematics

Posted on Aug 14, 2010


  • 10594 Answers


All three lights blinking on tv shows any one of following problems
1 - Color wheel is defective
2 - Lamp ballast is defective
3 - DMD board is defective
Does lamp turns On for moment before tv shuts off (you can observe it at rear of tv) that will confirm that either color wheel or any fan in tv is not running.
You should have service manual copy of tv to troubleshoot it.
Let me know if you have additional question.

Posted on Sep 10, 2010

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Related Questions:


How do I fix an LG42LN5700 flat screen TV that has a black screen?

Try to unplug the external component if possible for about 30 seconds and disconnect the HDMI cable from the TV and move it to a different port and plug the device back in and change the TV to the new input to see if the problem still occurs.

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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.

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.
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

Audio is fine. Why did picture suddenly go black?

The board that controls the back light for the screen is called an inverter board. Sometimes, depending on the model , the inverter is combined with the power supply board. Go here to find the parts

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Lg 50LN400-ua is the led driver on the power board

The power supply has the LED driver circuitry built in. I would suggest to measure the voltages without the LEDs connected to the power supply, if the voltages are present without the LEDs connected then you have a defective LEDs strips inside the panel. If the voltage is low or absent, the power supply should be replaced.

LG 50ln5200-ub led TV . Has no picture but great sound . What is the problem ? I did the flashlight test and can see the faint picture which tells me the backlighting is out . This tv model is a Black...

usually bad power supply, Where did you source your part? return/exchange it. Bad LEDs/ possible but not as likely, Tcon working if you can see images with flashlight. You must also have backlight on signal from main board ,check for 3 to 5v on labeled connecter on power supply. UPDATE---47" & 50" LN series. This model has had LED problems if your TV acts as described by Mr. Hughes in is answer to this problem you have bad LEDs
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