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Replaced Display on Vostro 1400, now it's light/fading in areas

I just replaced the LCD Display on my bosses Vostro 1400. And now there's some light spots and it comes up and then fades in and out. Any idea what could be causing it? I also replaced the LCD cable (JX282). Is it maybe just not connected well...? Or would adjusting resolution/contrast etc. do anything?

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  • Teresa22 Jun 16, 2009

    Yep got to do it myself. He didn't really say what was going on, just that it would come up and be light in some areas, and then fade back out. I'm going to open it up again and check the connections with the cables. Have you ever been inside one of these before? At the base of the display there's this little circuit board that the JX282 cable connects in to, and then another two-pronged connector that attaches to the motherboard (under keyboard) also connects to it. This piece was Not on the replacement screen, and I had to remove the silver casing from the old one, and put in on the new one, in order to attach this little circuit board. Have a feeling that's where the problem is...

  • Teresa22 Jun 16, 2009

    I'm pretty sure it was a brand new display, so those tubes should be ok, I would think.?

    Don't think he's in yet though, so I still have to see if anything actually shows up on the screen or what. I'll try opening it and seeing if the cables are smushed or anything though at the moment.

    I'll definitely keep ya posted!

  • Teresa22 Jun 16, 2009

    Alright, he said it came up fine at first, but then went black. I've seen a couple posts in forums about this. I'll have to take a look...

  • Teresa22 Jun 16, 2009

    Alright I opened it up and none of the pins looked bent or anything. But it still does the same thing. Comes up, but there's just that faint bluish light coming up from the bottom but then it stays blank.

    And, I just found out the JX282 cable I replaced, was a used one from EBay... :( So is that probably the problem...?

  • Teresa22 Jun 16, 2009

    Nothing at all comes up on the screen. The blue home light at the top of the keyboard and then the blue power light at the base of the keyboard comes on and that's it.

    If you're looking directly at it, the screen looks blank. But if you stand up and look down, it has that bluish-hue, over the whole screen... Like how it would look before going to a homescreen or something. Just the general light-bluish loading screen or whatever...

  • Teresa22 Jun 16, 2009

    K it's not the 'Home' light at the top of the keypad. It's the one that indicates the numeric keypad is enabled. And then the power light at the base of the keyboard. Those are the two blue lights that come on..

  • Teresa22 Jun 16, 2009

    Well, I figured it out!! That LCD cable (JX282) apparently is specific to each computer. That orange ribbon cable part has leads in specific places, and the new one we got doesn't match the old one. But now how to get the correct one....

    Oh, thanks for all the help though! Definitely coming back to this place when I have to fix something else for the boss man :) lol.

  • Teresa22 Jun 17, 2009

    I broke the orange ribbon cable, so no the old one won't work. He's got one on the way apparently, so hopefully this one matches.



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Did you do this yourself? It seems that the lcd is faulty, light spots point to a worn lcd screen. Not quite sure what you mean by the fading in/out. I need more details.

Posted on Jun 16, 2009

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  • Caleb Judd Jun 16, 2009

    Alright, that circuit board you are talking about is the CCFL Inverter. It provides a high voltage current to turn on the ccfl light inside the lcd screen. This could be the problem, but its likely that the actual ccfl tubes inside the screen are dying. they can often be replaced, if you are skilled enough you can take the ccfl tube out of your old lcd assuming it still works (should work if the screen is just cracked) and swap it with the new screen. nothing you can do about the light spots.
    if replacing the ccfl tube doesnt work then the inverter will be your problem.
    when the screen fades out can you still see the image on the screen very faintly?

  • Caleb Judd Jun 16, 2009

    you said the screen fades out. does it fade gradually or does it instantly go black?

  • Caleb Judd Jun 16, 2009

    What excactly does the screen do? does it suddenly go black or does it fade to black? can you see a faint image on the screen when it goes black? what does the bluish light at the bottom look like? could it be the taskbar in windows?

  • Caleb Judd Jun 16, 2009

    That bluish tinge when you look down at the screen means the backlight is turned on. does that seem right?
    does the screen ever come back on after its gone off (without restarting) the most common area of fault is the connector where the ribbon cable plugs into the motherboard or inside the hinge of the laptop. your Inverter is fine. you said you've replaced the lcd cable and still has the same problem which would lead me to believe it is a solder joint on the motherboard where the connector is.

    It is hard to tell from here though, the main thing you need to determine at this stage is whether there is an image on the screen with no light shining through from behind. or if there is no image and the blue tinge is made from the light shining onto a blank screen.

  • Caleb Judd Jun 16, 2009

    Whats wrong with the old one? will that work?


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Sounds like the connections are either loose or not properly connnected.
Checke the connectors again, and make sure you're not bending any pins in the process.

Posted on Jun 16, 2009

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Please be advice,, please call your technician to that... not properly installed..

Posted on Jun 16, 2009

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It is the screen Inverter, or the LCD screen itself.

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[ Primer:
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