Bad Logic board G4 MDD?

Discussion in 'PowerPC Macs' started by yumdrum, Apr 2, 2008.

  1. yumdrum macrumors newbie

    Joined:
    Apr 2, 2008
    #1
    Hi Guys, New member here.

    I was hoping the GURUs here may be able to help me.

    I have an older mirrorred face G4 dual 1G.

    It recently started acting weird (freezing) and then stopped working altogether.:eek:

    When I go to start I get 4 beeps followed by 5 flashes of the power light. After that revving fans.

    My research has told me that there is an issue with the logic board.

    I have checked the 3.6v battery and it is fine. I also have done the following:

    reset PRAM (just once mind you)

    Pulled all RAM and reseated in different ports and configurations.

    Pulled and reset the video card.

    Pulled everything else off of all USB ports and FW ports.

    I have sice taken the logic board out to have a look.

    All looks fine, but I really don't know if there is any way to test a board to see if it's bad, other than putting a new one in.

    Also, the red light on the logic board is on. From what I understand that is a sign of over-heating.

    That's where I'm at now.

    Any and all suggestion are welcome and greatly appreciated.

    Many thanks in advance,

    Dave
     
  2. shu82 macrumors 6502a

    shu82

    Joined:
    Jan 10, 2007
    Location:
    Rocket City, AL
  3. yumdrum thread starter macrumors newbie

    Joined:
    Apr 2, 2008
    #3
    Thanks for that. I have a question about the heatsink compound. If your heatsink and processor board have residue from the original compound, do I clean it off first before applying more, and if so with what? Or can I just re-use what's there?
     
  4. shu82 macrumors 6502a

    shu82

    Joined:
    Jan 10, 2007
    Location:
    Rocket City, AL
    #4
    The big chunks yes but I wouldn't risk damaging it by making it perfectly clean. And yes get more compound.
     
  5. FireSlash macrumors member

    Joined:
    Nov 11, 2007
    #5
    I've mixed compounds before... generally you get a small 1-2deg increase if you do (even with the same compound, since it tends to not like re-bonding with itself) but overall the hit isn't that bad. You can clean them up with a bit of work but I'd worry about that later if temps become an issue. Worry about getting it working first;)
     
  6. krye macrumors 68000

    krye

    Joined:
    Aug 21, 2007
    Location:
    USA
  7. yumdrum thread starter macrumors newbie

    Joined:
    Apr 2, 2008
    #7
    Dammit Jim, I'm a studio engineer, not a computer technician!
     

Share This Page