T400 screen problems...

Hi guys, I have a t400 that I purchased August of 2009, the LCD screen backlighting gradually messed up (i.e. half of it worked, or some sections would not have any backlighting while others would), so I changed it out.  The panel was 42T0705, a WXGA LED backlit samsung screen.  I bought the exact same FRU off of ebay, hooked it up, and booted my laptop up.  However, I find that the screen's backlight is on completely, but there is nothing displayed on the screen; I know that the computer is fully booted, though, because I can hear the windows startup sound and all that.  I tried hooking it up to an external monitor, but with no results.  Suggestions?
Btw, I have the integrated graphics option, and a P8xxx series processor.

Does putting in the original one work?
W520: i7-2720QM, Q2000M at 1080/688/1376, 21GB RAM, 500GB + 750GB HDD, FHD screen
X61T: L7500, 3GB RAM, 500GB HDD, XGA screen, Ultrabase
Y3P: 5Y70, 8GB RAM, 256GB SSD, QHD+ screen

Similar Messages

  • T400 Screen Problem

    My screen recently (about twenty minutes ago) started acting extremely "glitchy".  Horizontal lines were poping up all over the place that span the length of the monitor.  The lines distorted the image and appeared to be in a lower resolution.  In the process of typing this message out, the problem has disappeared.  Does anyone know what the issue is here?  I am in school so I can't afford to be without a computer for long.  How is Lenovo's repair time/ replacement policy?                                            

    Hello,
    please check with PC Doctor or Lenovo System Tool Box.
    I would suggest to call Lenovo hotline and tell them the results.
    Follow @LenovoForums on Twitter! Try the forum search, before first posting: Forum Search Option
    Please insert your type, model (not S/N) number and used OS in your posts.
    I´m a volunteer here using New X1 Carbon, ThinkPad Yoga, Yoga 11s, Yoga 13, T430s,T510, X220t, IdeaCentre B540.
    TIP: If your computer runs satisfactorily now, it may not be necessary to update the system.
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  • T400 Flickering Screen problem

    I am having a problem where my computer screen keeps flickering, especially during start up and afterwards. It doesnt matter whether it is plugged in or not. It is similar to this video,
    http://www.youtube.com/watch?v=9MOv_NsFqpQ&noredirect=1
    I took it to my tech support and no one had any idea what to do about it. In addition, images on random websites (anything from huffington post to yelp) only half load. I uninstalled and reinstalled my browsers and updated my drivers.
    This laptop has given me problems since I bought it. I once sent it into lenovo for repair and it had to be sent right back again. Another time i got a replacement battery and it arrived coated in sand and seemed worse than the original - (but was going abroad so I couldnt wait for another replacement.)
    Since it is out of warranty, I am wondering if there is any way to fix this or whether I need to get a new laptop. Thanks!

    Hi silverlainy,
    Here go a couple references I found on the issue.
    Check out some of the solutions to see if they'll work for you.
    http://forums.lenovo.com/t5/T400-T500-and-newer-T-series/T400-screen-flickering-problem/td-p/251783
    http://forums.lenovo.com/t5/T400-T500-and-newer-T-series/T400-screen-quot-blinks-quot-every-5-second...
    Even though you are out of warranty Lenovo can still have perform the repairs.
    If you'd like, contact the support line and see about having a quote prepared.
    Lenovo Support
    ThinkPad or ThinkCentre products
    1-800-426-7378
    Hope this helps, let us know what you decided to do.
    HAPPY HOLIDAYS!!
    Be AWESOME Everyday!
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    Press the star on the left to thank them with a Kudo!
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    This will help the rest of the Community with similar issues identify the verified solution and benefit from it.

  • Lenovo T400 screen goes dark issue, some video driver problem

    Lenovo:
    Motherboard:
    CPU Type: Mobile DualCore Intel Core 2 Duo P8600, 2400 MHz (9 x 267)
    Motherboard Chipset:  Intel Cantiga GM45
    System Memory: 1992 MB (DDR3 SDRAM)
    BIOS Type: Phoenix (08/19/08)
    Display:
    Video Adapter: Mobile Intel(R) 4 Series Express Chipset Family 
    Video Adapter: Mobile Intel(R) 4 Series Express Chipset Family 
    3D Accelerator: ATI Mobility Radeon HD 3470 
    Problem/Issue:
    Driver problem appeard after upgrading from XP to Windows 7.
    From the Device Manager I saw that ATI Mobility Radeon HD 3470 was not working properly and
    a) I did the "update driver software." After restart the screen light was darker than usual. (This was usual if I was working from battery but I was plugged in this time. ) 
    As I'm not the best with computers I thought my drivers might be in conflict and to prevent serious damages, I just
    b) disabled ATI Mobility Radeon HD 3470 from device manager. 
    This actually resolved the dark screen problem.
    c) then I went to Lenovo support site: http://support.lenovo.com/en_US/research/hints-or-tips/detail.page?&LegacyDocID=MIGR-72858
    downloaded newest drivers for ATI Mobility Radeon HD 3400 (Switchable Graphics Driver)
    and Intel 4500MHD (Intel GM45 Express Chip)
    For some reason while installine the: Intel GM45 Display Driver (version 8.15.10.2302) gives me error:
    "This Computer Does not meet the minimum requirements for installing the software"
    Also some problem appeard when installing the new downloaded version:
    ThinkPad Switchable Graphics Driver  (version 8.792.5-110424b-119200C)
    d) so I went back to device manager and made an update to ATI Mobility Radeon  from there. 
    Well, I got it working, but the screen went dark again. When I disable the driver it goes back to normal
    brightness and when I enable it again, it stays normal.
    I'll try to restart and see what happens

    We had the excat same issue.
    I could get the picuture back pressing the power button until it went to sleep and then wake it up again.
    After the I went to device manager to delete all display drivers both Intel and ATI and then reboot.
    doing the reboot windows found some drivers it could use.
    I then installed the switchable driver from lenovo.
    Now windows device manger report two display drivers:
    1)
    ATI Mobility Radeon HD 3400 Series, Version 8.792.5.2000, Driver manufacturer ATI Technologies Inc
    2)
    Mobile Intel(R) 4 Series Express Chipset Family, Version, Version 8.792.5.2000, Driver manufacturer ATI Technologies Inc
    So it seams the switchable ATI driver take over the Intel card and the Intel driver is not needed.
    At least the problem is solved for us.
    Regards Anders

  • T400 Screen flickers, when I connect power adapater in my home

    T400 Screen flickers, when I connect power adapater in my home. When I connect the same power adapter in my office. It works fine. Can any one please suggest me, what's the issue with the T400 laptop. If it's a issue with my power supply in my home , how all other computers are working.

    Hi Snowfall,
    Have you resolved your flickering issue? It looks like I have the same on my Ideapad Y550P. Screen flickers occasionally when I work connected to the power adapter at home. And what is more concerning is that the brightness control also stops functioning sometimes.
    In your case how has the situation evolved? Has your laptop been repaired or you just live with it as is or has the issue deteriorated into something worse? Just want to get some arguments in my discussions with the SL2 support who cannot reproduce the problem in their office...
    Any extra informaton is much appreciated.
    Regards, Alexey

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      iMac - model: iMac14,2
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      BANK 1/DIMM0
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      [not loaded] com.adobe.AAM.Updater-1.0.plist Support
      [failed] com.adobe.AdobeCreativeCloud.plist Support
      [loaded] com.oracle.java.Java-Updater.plist Support
      [running] com.wacom.wacomtablet.plist Support
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      [loaded] com.adobe.fpsaud.plist Support
      [running] com.fitbit.galileod.plist Support
      [loaded] com.oracle.java.Helper-Tool.plist Support
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      [loaded] com.adobe.AAM.Updater-1.0.plist Support
      [loaded] com.adobe.ARM.[...].plist Support
      [loaded] com.google.keystone.agent.plist Support
      [loaded] com.koingosw.MacCleanse4Helper.Reminder.plist Support
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      AdobeAAMDetect: Version: AdobeAAMDetect 2.0.0.0 - SDK 10.7 Support
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      708 MB Inactive RAM
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