MBP very dark screen (can barely see anything)

Discussion in 'MacBook Pro' started by Revtop22, Aug 30, 2008.

  1. Revtop22 macrumors newbie

    Joined:
    Jan 27, 2008
    #1
    My mbp has been on the fritz and I stopped using it for a while..... but now I'd like to get it working again. First it won't boot past the Apple logo and the spinning indicator. I have no idea why. The last time I used it, I shut it down and the next time I turned it on, it would sit at the logo. This time there's a twist though. The screen is incredibly dark. So dark I can bare see the Apple. I've tried the brightness shortcuts but I'm not getting anything.

    Any help would be greatly appreciated here.


    Edit: Got the hard drive to work and now everything is functioning fine EXCEPT for the backlight. It isn't receiving any power and that is why everything is so dark. Does anyone know how much voltage is required to power the backlight?
     
  2. todd2fst4u macrumors regular

    Joined:
    Jul 13, 2008
  3. otispunkmeyer macrumors 6502

    Joined:
    Jun 5, 2007
    Location:
    Middlesbrough UK
    #3
    the backlight shortcuts (or any kb shortcuts) dont work at the boot up screen (white + apple logo + spinning thing)

    is that actually real?

    what if the robber simply didnt hook the mac to the web and reformatted the hard disk... $50 down the drain?
     
  4. sickmacdoc macrumors 68020

    sickmacdoc

    Joined:
    Jun 14, 2008
    Location:
    New Hampshire
    #4
    Well, from the FAQ section of that link (though they should update it since it works with Leopard too):

    "What if someone does a clean install of OS X on my machine?
    You can prevent this by installing a firmware password. You can find the firmware password utility on your Mac OS X Tiger DVD (in /Applications/Utilities/ on the disc). Make sure to reboot your Mac after enabling the firmware password."
     
  5. Tallest Skil macrumors P6

    Tallest Skil

    Joined:
    Aug 13, 2006
    Location:
    1 Geostationary Tower Plaza
    #5
    Yep, I have it installed on my current laptop. As has been said, a firmware password will prevent a reinstall. It'd be more like $1,000+ down the drain, anyway, since you'd have lost a computer.
     
  6. DoFoT9 macrumors P6

    DoFoT9

    Joined:
    Jun 11, 2007
    Location:
    Singapore
  7. Revtop22 thread starter macrumors newbie

    Joined:
    Jan 27, 2008
    #7
    It's not stolen. I bought 3 Santa Rosa mbps when they first came out. The others never had a single problem. This is the first time I haven't been able to fix something myself. I went as far as a screen swap and that did nothing. Only thing I haven't been able to do yet is try an external monitor.


    I'll have a pic in just a sec...
     
  8. Revtop22 thread starter macrumors newbie

    Joined:
    Jan 27, 2008
    #8
    Here's a pic. You can only see it with the flash. Otherwise it blends in too much.

    [​IMG]
     
  9. Inconsequential macrumors 68000

    Joined:
    Sep 12, 2007
    #9
    My MBP got stuck at that when the HD semi died.
     
  10. Revtop22 thread starter macrumors newbie

    Joined:
    Jan 27, 2008
    #10
    Ok I was able to put the osx cd in and though I could barely read the prompting, it somehow managed to get me back to the desktop. Now I just have to figure out why I can't get out of this super dark screen mode. It's like the backlight is turned off completely. Any idea folks?
     
  11. otispunkmeyer macrumors 6502

    Joined:
    Jun 5, 2007
    Location:
    Middlesbrough UK
    #11
    backlight could be dead? do the shortcut keys or even the preference pane do anything for the brightness now that your in the desktop?

    also i never knew about that firmware password thing. im scared to do it though coz i know ill miss place it
     
  12. Revtop22 thread starter macrumors newbie

    Joined:
    Jan 27, 2008
    #12
    I can't believe the backlight could be dead. I've swapped the entire display once before with one of my other MBP's and it appears the same. The pref panel does nothing (already on highest setting) and the keyboard shortcuts indicate it's the brightest it will go. Going to check to see if the DVI port works next. Other than that I don't know anything else software wise to try. Any suggestions would be great. Is this something a firmware update might fix?


    Edit:

    Looks like the DVI port works just fine. I just think for some reason the backlight isn't receiving power. I need a volt meter to figure this one out but something tells me it's either cables/connectors or the inverter (though I've tried two different ones up to this point)..
     
  13. Silenus macrumors newbie

    Joined:
    Aug 31, 2008
    #13
    This happened to my laptop earlier this year.

    The backlight itself was fine, but the inverter board was bad. Apparently it controls power to the backlight. Apple replaced it for $175.
     
  14. Revtop22 thread starter macrumors newbie

    Joined:
    Jan 27, 2008
    #14
  15. Silenus macrumors newbie

    Joined:
    Aug 31, 2008
    #15
    That's what they replaced, yep. Sorry, must be something else in your case.
     
  16. monkey86 macrumors 6502

    monkey86

    Joined:
    Aug 5, 2008
    Location:
    London
    #16
    if the inverter doesnt help your backlight is dead.

    i have the exact same problem in my pb 15" waiting on a replacement lcd at the mo.
     
  17. Revtop22 thread starter macrumors newbie

    Joined:
    Jan 27, 2008
    #17

    Backlight isn't dead. I just applied a little voltage to it and the backlight lit up as it should. Makes me wonder why it isn't receiving power from the DC-in board.
     
  18. alphaod macrumors Core

    alphaod

    Joined:
    Feb 9, 2008
    Location:
    NYC
    #18
    If it won't boot past the Apple logo it means your HDD is broken and the backlight doesn't come on since during boot the external peripherals (touchpad and keyboard are peripherals too!) have not been initialized.

    Try to boot into your Restore DVD and the backlight should come on since the drivers will initialized the touchpad and keyboard.
     
  19. Revtop22 thread starter macrumors newbie

    Joined:
    Jan 27, 2008
    #19

    I got the hard drive to work after I put the DVD in earlier. Everything works including the external DVI port. Now I just can't figure out why the logic board isn't sending juice (for the backlight) to the DC-in/sound board. If I knew were the juice was coming from I'd solder on a wire but I haven't the slightest idea right now.


    Edit: Anyone know the voltage it takes to power the backlight?
     

Share This Page