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Samsung R540 Screen LED Backlight Not Working

My nephew dropped his laptop and destroyed the original screen.  I ordered a new one and it wouldn't work after installing it.  I ordered an OEM Screen thinking that was the issue, but the new screen backlight doesn't work either.  I've checked the video cable (with a new one) as well, but still can't get anything.  I can see the display if I shine my flashlight on the screen so I know it's just the backlight.  Is there a simple way to troubleshoot what could be causing this?
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Brad Sims, CCNA
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Brad Sims, CCNA
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AusRobCommented:
I don't know that particular model, but unless it's an LED backlit screen, there is a board under the LCD panel that converts the DC volts from the battery to AC High Voltage for the Flouro back light tube (over 1000 volts). I presume the new screen you ordered came with the bulb built in? If so, it sounds like the inverter has failed.
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nobusCommented:
that is called the inverter, look here for testing it :  http://www.youtube.com/watch?v=2Yi6GNFcP3w
usually you can test the inverter with any backlight
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Brad Sims, CCNANetwork AdministratorAuthor Commented:
It is an LED.  I have an LCD inverter tester.
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nobusCommented:
ah i see - then there is no inverter
that leaves only the video card = mobo...
maybe time for a new laptop?   unless you still have warranty left
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AusRobCommented:
you can still test the LED backlight, but it might take a little more research. Here is a link to a pretty good explanation of how;

http://www.technibble.com/forums/showthread.php?t=38262

 If you can find the wires leading from the video card that provide power to the backlight, you can use a multimeter to check the volts. Also, if you have a standard desktop PC, you can rig up a test cable to check the actual backlight LEDs in each panel, (I presume you still have the old one?). You only need fairly basic knowledge of electronics to do this.
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nobusCommented:
this is a ready made one :  http://www.lcdparts.net/IT02.aspx
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