>i seem to have a problem with my old Macintosh display. i took a shot >of it and you can see it at http://www.flickr.com/photos/91379880@N00/6242620937/ >anyone here have any idea?
It looks like an issue with the vertical sweep. I have seen cases where only about half of the screen is used: this is a failure of the vertical sweep. However I haven't seen anything like yours... If this isn't just a bad floppy disc, you can check a few things part of the vertical sweep circuit. - disconnect and reconnect your cable harness between the logic board and analog board. - check for a cracked solder on the J4 connector: it's best to de-solder and re-solder the complete connector on the Analog board. - check the green, vertical sync, wire from the analog board to the logic board for continuity - check resistors R2 and R3 on the analog board: in-circuit test should almost read zero ( < 1.5 Ohm ) - Look for tarnish on the CRT pins: when some are discolored clean them with a metal cleaner. Let me know if anything worked to get it sorted. Take Care, Nico -- ----- You received this message because you are a member of the Vintage Macs group. The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] To leave this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/vintage-macs Support for older Macs: http://lowendmac.com/services/
