Powerbook G4 - Blue Artifacts on Screen

Discussion in 'PowerPC Macs' started by zdobson, Apr 19, 2011.

  1. macrumors 6502

    Joined:
    Nov 9, 2007
    Location:
    Indiana
    #1
    I have a 15" PBG4 1.25ghz and am having some screen artifacts show up. Everything is running fine otherwise. I haven't used this machine at all in months and I'm trying to clean it up to sell it. Any info would be helpful.

    [​IMG]
     
  2. macrumors 6502a

    bizzle

    Joined:
    Jun 29, 2008
    #2
    Bad GPU son.
     
  3. macrumors 68000

    Nameci

    Joined:
    Oct 29, 2010
    Location:
    The Philippines...
    #3
    Try to connect an external monitor and see if it also displays the same. If it is then it is GPU, if it is not then it could be the LVDS connector or the LVDS cable.
     
  4. macrumors 6502

    iMacC2D

    Joined:
    Jun 24, 2010
    #4
    The fact that the artifacts have appeared in the screenshot is a good indication that the LCD is not at fault. It's most certainly a defective GPU. Not much that can be done with it now, ignoring the fact that logic boards are expensive, i'd doubt that Apple would even stock parts for them anymore.
     
  5. thread starter macrumors 6502

    Joined:
    Nov 9, 2007
    Location:
    Indiana
    #5
    I'll try the suggestion of hooking up a monitor first. I'm currently formatting the HD to remove personal info, so I'll have to wait until after that.

    What should I do with this machine? Should I replace the logic board? I found a used one for $100 on eBay. I'm planning to buy a new MBP and would like to get any money I can out of this.
     
  6. thread starter macrumors 6502

    Joined:
    Nov 9, 2007
    Location:
    Indiana
    #6
    Now this is looking different. I'm not sure why this would have changed. The finder windows are clear.

    [​IMG]

    Also, the CPU keeps running between 30-90% even though there are no applications running (other than activity monitor). Related or no?
     
  7. macrumors 68000

    Nameci

    Joined:
    Oct 29, 2010
    Location:
    The Philippines...
    #7
    If I were you i would try to strip memory, or reseat memory on the slot.
     
  8. thread starter macrumors 6502

    Joined:
    Nov 9, 2007
    Location:
    Indiana
    #8
    Pulled both out and switched them. No change.
     
  9. macrumors 68000

    Nameci

    Joined:
    Oct 29, 2010
    Location:
    The Philippines...
    #9
    Have you tried to use an external monitor, that would tell you if your gfx chip is bad.
     
  10. thread starter macrumors 6502

    Joined:
    Nov 9, 2007
    Location:
    Indiana
    #10
    Yes, external monitor looked like the second photo. Now everything is back looking like the first photo.
     
  11. macrumors 68000

    Nameci

    Joined:
    Oct 29, 2010
    Location:
    The Philippines...
    #11
    for sure you have a faulty gfx chip. Your best bet is to replace the logic board.
     
  12. macrumors 65816

    adcx64

    Joined:
    Nov 17, 2008
    Location:
    Cudi Zone
    #12
    Maybe the GPU just needs to be reflowed?
     
  13. macrumors 68000

    Joined:
    Feb 13, 2009
    Location:
    United Kingdom
    #13
    That wasn't an issue on that series of powerbooks. Also, I wouldn't recommend attempting a reflow.. a new logic board is much easier, especially since I dont think it is a reflow issue - since the gfx is working but corrupted.
     
  14. macrumors 68000

    Nameci

    Joined:
    Oct 29, 2010
    Location:
    The Philippines...
    #14
    Seems to me that it is caused by a faulty video memory...
     
  15. macrumors 68020

    zen.state

    Joined:
    Mar 13, 2005
    #15
    This is my guess also. I think if it was the GPU the video would be far worse or maybe not even work at all. Since the PowerBooks have dedicated video memory this can't be fixed with new system RAM as you wondered earlier in the thread.

    Best solution would be a new logic board.
     

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