Vertical color stripes on LCD screen

Laptop

Laptop
Laptop computer Forums (Audio, General Hardware, Video)

Vertical color stripes on LCD screen

  • Here’s the deal. I’ve got a Dell inspiron B120 laptop with both Windows XP and Mandriva Linux  installed on it. I just replaced the LCD screen since the previous one was periodically blacking out. I got the new one in and everything put back together only to discover a new problem. I get random vertical stripes across the whole display and I can’t see anything else.

     

    Starting the computer up normally the screen works fine up until when the windows desktop appears. I see the Dell splash screen, the bootloader, and the windows loading screen just fine. If I boot into Mandriva instead of windows there are no problems. I can get into the BIOS, Windows Safe Mode, or the Dell Diagnostics utility partition and the screen functions correctly. It only freaks out once I get to the desktop in normal Windows XP. I’ve tried changing the screen resolution back to 800x600 in safe mode and rebooting back into windows and it does me no good.

     

    I’ve performed some tests on the LCD in the Dell Diagnostics and nothing comes up screwy. It tests resolutions up to 1024x780 with no problems but does not try anything higher than that.

     

    There are a few exceptions to this (this is where things get really weird). No matter what I’m doing if I perform a reboot (from Windows or Linux) the LCD immediately displays the vertical bars again (the splash and bootloader screens are no longer visible). Also, if I hook up an external monitor it seems to fix the problem. I will still get the random color stripes, but if I switch the output to the external monitor and then back again suddenly the LCD works. Wat!!??

     

    Does anybody have any idea what kind of craziness is going on here? I’ve already checked three time to make sure that the new LCD was plugged in correctly and completely, so unfortunately its nothing so simple. I should probably mention that the replacement LCD was not bought from DELL, but on ebay. It was specifically marked as a DELL Inspiron B120 LCD Screen and has the matching specs so far as I can tell.

     

    Thanks for any and all help, I appreciate it. 

  • Looks like the replacement LCD screen is faulty. To confirm you could try the old one back again; if only the blacking out occurs you will have confirmation.
    John

    My Dell system

    Inspiron 1520 purchased 5 Feb 2008
    Windows Vista Home Premium SP2
    Intel Core 2 Duo Processor T7250:2.0Ghz, 2MB cache, 800MHz FSB
    4GB 667MHz Dual Channel DDR2 SDRAM
    NVIDIA GeForce 8600M GT with 256MB dedicated graphics memory
  • I have put the old screen back in and it works fine. What concerns me is that the new one works everywhere except for the Windows desktop. This hints at a software problem of some sort. Then again, even if I boot into Linux where everything is peachy as soon as I reboot the LCD doesn't work even at the BIOS splash screen until I completely power down the system. It makes it really hard to figure out what's going on here
  • I am inclined to put my money on a hardware fault. There could be a conditionally stable situation in the LCD driving circuitry whereby instability is triggered only with certain inputs.
    John

    My Dell system

    Inspiron 1520 purchased 5 Feb 2008
    Windows Vista Home Premium SP2
    Intel Core 2 Duo Processor T7250:2.0Ghz, 2MB cache, 800MHz FSB
    4GB 667MHz Dual Channel DDR2 SDRAM
    NVIDIA GeForce 8600M GT with 256MB dedicated graphics memory