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42LG20-UM I can hear sound but picture is black. I can see faint picture if I am in the dark with a flashlight pointing towards the screen. What could this be?

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Check its back light inverter board. In most cases, the board has to be replaced with new one. If you wish to get more details, check the site linked below. Pull up older posts there. Check the site with patience, as it has over 2400 posts now. All are related to electronic equipment repair help. If you search the site in Timeslide option, which can be selected from the drop down list at the top left of the display window, it will be easy to locate the related post. You can also do a search by type in the brand name to your device into its search box at the top right of display window.http://electronicshelponline.blogspot.com/

Posted on May 02, 2013

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: sound works but no picture. black screen

I've had the same problem. Usually, if I turn the TV off and then back on again, it's fine.

Posted on Mar 05, 2009

  • 187 Answers

SOURCE: seems as if LCD screen is not recieving any power, I have no picture or sound right now but can faintly hear speakers power up when I turn the unit on.

Mainboard damaged.


Posted on Jun 02, 2009

  • 458 Answers

SOURCE: 42" LG Plasma tv, no picture - black screen, but have sound.

Most a likely a problem with your Y-Sustain board which will then not drive the screen giving a black picture. The fuse on the board may be open circuit & need replaced but most likely you will need to have the sustain board replaced.

Posted on Oct 28, 2009

  • 1779 Answers

SOURCE: 47inch toshiba lcd tv (HL167) black picture, but

Best to replace both at the same time . Yes they are easy if you can find the parts.

Posted on Dec 15, 2009

  • 3 Answers

SOURCE: Philips 42PFL5432D-37 black screen

A local repair shop, recommended off ShopJimmy.com, repaired ours with the exact problem for less than $250 total. Inverters were bad. The parts were $50 each at Shop Jimmy so the shop dx'd the problem and repaired it for less than $250 total! Very happy.

Trick they showed us.... turn off lights in the room and shine a flashlight down the t.v. The picture can be seen which means it's not all the horrible problems you might think.

Posted on Dec 23, 2009

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You likely have a LCD set there which may likely use a back light inside to light the image, get the room as dark as you can and with a flashlight illuminate the screen from a angle, with set on if you can see the faint image on the screen of the program you have a Backlight issue'

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If the image can be seen with a flashlight one of the above is the issue and your "picture will appear very faintly" also suggests this.

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If its LCD get the room very very dark and turn on--with a flashlight near the screen look closely at the screen to see if you see a very faint image of the picture or not---Most LCD flatscreen's (not Plasma) use what is called a back light to light the screen--light source.

If a faint picture can be seen that way the light is not on.

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I would first take a look at the screen with set on in a very dark room with a flashlight---do you see a very faint image or picture? That would indicate a back light issue-----Good luck getting a board, I hear the company is again out of business.

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Try in a very dark room with set on to look close at screen and or use a flashlight to see if faint images can be seen or not......

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How can I fix a 42lg20-um with a faded screen?


The faded screen(if you mean faint image) is due to failed backlight inverter board. THe backlight is sealed behind the LCD paneland lights up the image . Replacing the inverter board should resolve the problem. In sets of this size there are usually master and slave inverters. Let me know if you wish to fix it yourself so that I can give you the instructions.

Sai.

Apr 27, 2011 | LG Televison & Video

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