Mac Classic: not well know ... chessboard problem

Discussion in 'Apple Collectors' started by BigLynx, Jun 10, 2014.

  1. BigLynx macrumors newbie

    Joined:
    Feb 26, 2012
    Location:
    Poland
    #1
    One of my Classic Macs has strange problems with display and of course booting up. It seems to be similar to well known on-motherboard-capacitors problem (e.g. https://www.youtube.com/watch?v=5GivbpvLpm4) but the issue is that on other system the motherboard works well without chessboard on screen. Also - other motherboard on the Classic in question doesn't resolve the problem. I see the same on the screen - a little bit floating chessboard:

    [​IMG]

    If you prefer movie it is available here: http://www.tomekrys.pl/tmp/mac_szachownica_film.MOV

    Any ideas?
     
  2. Intell macrumors P6

    Intell

    Joined:
    Jan 24, 2010
    Location:
    Inside
    #2
    That could be a failing power supply. You may want to check the SCSI power cable to make sure it's outputting 12.00 volts or very close to that. If it isn't, you may have to replace the capacitors on the power supply.
     
  3. BigLynx thread starter macrumors newbie

    Joined:
    Feb 26, 2012
    Location:
    Poland
    #3
    Do you suggest to replace all capacitors on analog board?
     

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