What does this Cap do?

Discussion in 'PowerPC Macs' started by MatthewLTL, Feb 22, 2015.

  1. MatthewLTL macrumors 68000

    MatthewLTL

    Joined:
    Jan 22, 2015
    Location:
    Rochester, MN
    #1
    [​IMG]

    The Cap in question is on the top left (in picture) the the 2nd cap up from the ATA100 IDE connector and above the cap next to that little heatsink.

    This cap fell off my logic board several months ago. I realized today that this location is where that cap goes. What does it do? Could it be the cause of no DVI Video? Could it be the reason my AirPort Extreme Died? Should I reattach it?
     
  2. havokalien macrumors 6502a

    havokalien

    Joined:
    Apr 27, 2006
    Location:
    Kelso, Wa
    #2
    could do anything

    A cap that falls off could do anything. I would think the video card caps and thermal paste would be more suspect but a missing cap on a motherboard could cause any number of conditions.
     
  3. poiihy macrumors 68020

    poiihy

    Joined:
    Aug 22, 2014
    #3
    This one?
     

    Attached Files:

    • $_57.JPG
      $_57.JPG
      File size:
      273.4 KB
      Views:
      32
  4. MatthewLTL thread starter macrumors 68000

    MatthewLTL

    Joined:
    Jan 22, 2015
    Location:
    Rochester, MN
  5. harrymatic macrumors 6502

    Joined:
    Dec 30, 2013
    Location:
    United Kingdom
    #5
    It's probably a decoupling capacitor to smooth out any voltage transients. I doubt it's the reason for the problems you mentioned, but it's not very difficult to replace it. I've accidentally knocked capacitors off PC motherboards and they've been fine.
     
  6. poiihy macrumors 68020

    poiihy

    Joined:
    Aug 22, 2014
    #6
    So those metal cylinders are capacitors? I've seen them many times on USB things but didn't know what they were.
     
  7. MatthewLTL thread starter macrumors 68000

    MatthewLTL

    Joined:
    Jan 22, 2015
    Location:
    Rochester, MN
    #7
    actually no, its the one right below that one
     
  8. poiihy macrumors 68020

    poiihy

    Joined:
    Aug 22, 2014
    #8
    oh ok so this one
     

    Attached Files:

    • $_57.JPG
      $_57.JPG
      File size:
      298.9 KB
      Views:
      22
  9. MatthewLTL thread starter macrumors 68000

    MatthewLTL

    Joined:
    Jan 22, 2015
    Location:
    Rochester, MN
    #9
    yes Any idea why the ATA100 bus wont work?
     
  10. poiihy macrumors 68020

    poiihy

    Joined:
    Aug 22, 2014
    #10
    Maybe because the cap right next to it is missing?
    You can inspect the tracks to/from the cap solder connections to see where it connects to.
     
  11. MatthewLTL thread starter macrumors 68000

    MatthewLTL

    Joined:
    Jan 22, 2015
    Location:
    Rochester, MN
    #11
    the cap broke off almost a year ago
     
  12. poiihy macrumors 68020

    poiihy

    Joined:
    Aug 22, 2014
    #12
    And did the port stop working almost a year ago too or did it stop working recently?
     
  13. MatthewLTL thread starter macrumors 68000

    MatthewLTL

    Joined:
    Jan 22, 2015
    Location:
    Rochester, MN
    #13
    stopped working last night
     
  14. poiihy macrumors 68020

    poiihy

    Joined:
    Aug 22, 2014
    #14
    dunno then
     

Share This Page