Powerbook 17" Problem

Discussion in 'PowerPC Macs' started by Dronecatcher, Dec 19, 2015.

  1. Dronecatcher macrumors 68000

    Dronecatcher

    Joined:
    Jun 17, 2014
    Location:
    Lincolnshire, UK
    #1
    I've just got something I've been after for a long while - a 1.67Ghz 17" Powerbook.
    However, after doing a fresh Leopard install, the display has started breaking up (see photos) - it comes and goes, is this heat related, do the insides need a clean out or is this a failing motherboard/GPU? Has anyone experienced this one before?
    Such a disappointment as the Powerbook was a great price with 2Gb RAM and a 100Gb 7200 drive too.

    1.jpg 2.jpg
     
  2. MagicBoy macrumors 68040

    MagicBoy

    Joined:
    May 28, 2006
    Location:
    Manchester, UK
    #2
    Does it do the same when connected to an external monitor?
     
  3. Dronecatcher thread starter macrumors 68000

    Dronecatcher

    Joined:
    Jun 17, 2014
    Location:
    Lincolnshire, UK
    #3
    I haven't tried that yet, won't be able to for a while. First thing I did was flex the lid to see if made a difference but it didn't. I raised the laptop off the desk to let some air circulate and that appeared to make a difference, however when the problem returned the laptop was only idling anyway.
     
  4. MagicBoy macrumors 68040

    MagicBoy

    Joined:
    May 28, 2006
    Location:
    Manchester, UK
    #4
    At first glance it looks more likely to be either the display panel or the cable, hence suggesting trying an external display. VRAM or GPU issues tend to be artefact-y rather than uniformly scrambled.
     
  5. Dronecatcher thread starter macrumors 68000

    Dronecatcher

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    Jun 17, 2014
    Location:
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    #5
    Thanks, I'll hook up a monitor later and verify. Only seems to occur after machine has been on a while, which makes me think thermal related.
     
  6. eyoungren macrumors P6

    eyoungren

    Joined:
    Aug 31, 2011
    Location:
    Phoenix • 85037
    #6
    I think your GPU is going. I would bet that you will get the same on an external. This looks like a bad GPU versus a bad LCVD cable or dying display.

    That unfortunately, means logicboard.
     
  7. thewap macrumors demi-god

    thewap

    Joined:
    Jun 19, 2012
    #7
    You might try first repasting the logic board with new thermal paste to see if degrading of the thermal paste is the problem. If it doesn't work, a replacement logic board for that model is not too expensive ob the secondary market.
     
  8. Dronecatcher thread starter macrumors 68000

    Dronecatcher

    Joined:
    Jun 17, 2014
    Location:
    Lincolnshire, UK
    #8
    Thanks for the input guys.
    Tried it with an external monitor today - firstly the problem was there straightaway so it's not thermal related but the external monitor worked fine - absolutely no problems at all whilst the laptop was showing a digital snow storm. Also, moving the lid made no difference but tipping the laptop up did and managed to stop the issue (at least for a while).
    Would it be too simplistic to assume something is loose? When I have the time and feel masochistic enough I'll have to crack it open and check the internals over.
     
  9. eyoungren macrumors P6

    eyoungren

    Joined:
    Aug 31, 2011
    Location:
    Phoenix • 85037
    #9
    Then it's the LCVD cable. Worn or pinched.

    You can either replace it, which requires taking the back of the display off, or replace the entire screen.
     
  10. thewap macrumors demi-god

    thewap

    Joined:
    Jun 19, 2012
    #10
    +1
     
  11. flyrod macrumors 6502

    flyrod

    Joined:
    Jan 12, 2015
    #11
    I've never worked on one before, but you could try re-seating the cable where it connects to the logic board. With the lid off, you could start it up and poke/prod various things to try and locate the bad connection.
     
  12. MacCubed macrumors 68000

    MacCubed

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    Apr 26, 2014
    Location:
    Florida
    #12
    I was about to say that too!, it could have come loose on either end, whether it's the connector on the LCD, or the on on the LB
     
  13. Mnowell69 macrumors regular

    Mnowell69

    Joined:
    Jul 4, 2013
    Location:
    Bedford, UK
    #13
    Have exactly the same problem with my Powerbook, and it is the cable, or more precisely where the cable sits in the logic board. I had to tape the cable down to the logic board in such a way that it would work properly. I have no idea if the end of the cable is damaged (it doesn't look bad) or of the connector on the logic board is damaged.!
     
  14. eyoungren macrumors P6

    eyoungren

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    Aug 31, 2011
    Location:
    Phoenix • 85037
    #14
    The cable goes out through the hinge in to the back of the screen.

    Over time, the action of opening and closing the lid can wear away the insulation on the cable and cause this problem. The only recourse is replacing the cable or the screen.
     
  15. 128keaton macrumors 68020

    128keaton

    Joined:
    Jan 13, 2013
    #15
    This looks exactly like a problem I had on a Uni-Alum MacBook (late 08). The display cable had worn and touching/moving the screen from one corner froze the Mac on a screen like show. Luckily for you, an LVDS cable is an easy replacement.
     
  16. Dronecatcher thread starter macrumors 68000

    Dronecatcher

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    Jun 17, 2014
    Location:
    Lincolnshire, UK
    #16
    Will check out the motherboard side of the connector at some point then - definitely not going into the screen panel...that looks too painful!
     
  17. 128keaton macrumors 68020

    128keaton

    Joined:
    Jan 13, 2013
    #17
    Yes. I have a bent 17" bezel, and a warped 12" back. Screw those clips and screws.
     

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