1 Reply Latest reply: Jul 19, 2014 12:47 AM by Jan Hedlund
MrJR87 Level 1 (0 points)

G'day Guys.


I'm having a technical problem with my Old Macintosh LC II that has just occured just the other day. somehow the Mouse and the Keyboard doesn't seem to respond at all. I even check the continuity reading using the multimeter to that Keyboard jack, the continuity reading indicates that keyboard jack still works and operational. I even plugged another Macintosh Keyboard to it as well as the mouse, It still will not work. I even plugged in the spare Macintosh Mouse as well without the keyboard. Still no luck with getting any response or point cursor movement.ers,


Any help will be great.


Macintosh LC II, Mac OS 8.6 or Earlier
  • Jan Hedlund Level 6 (9,715 points)



    You have carried out the basic tests already (including trying to use the computer with merely a spare mouse). Everything indicates that the problem is inside the LC II. Has the keyboard cable at some point possibly been disconnected while the computer was running? The ADB circuits can in certain cases become damaged if something like that happens. You may also want to inspect the logic board and its connectors/ports with a magnifying glass for obvious signs of failure (look for broken circuit board traces, bad solder joints and cracked/bulging/leaking/discoloured electrolytic capacitors and other electronic components).


    A bad logic board battery should not have anything to do with this (unless leaking), but the 3.6 V voltage could be checked at the same time.