Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!cis.ohio-state.edu!pacific.mps.ohio-state.edu!linac!unixhub!stanford.edu!neon.Stanford.EDU!kaufman From: kaufman@neon.Stanford.EDU (Marc T. Kaufman) Newsgroups: comp.sys.mac.hardware Subject: Re: MacIIci Monitor Grief Message-ID: <1991Jun26.163821.28505@neon.Stanford.EDU> Date: 26 Jun 91 16:38:21 GMT References: <8284@ecs.soton.ac.uk> Organization: Computer Science Department, Stanford University, Ca , USA Lines: 21 In article <8284@ecs.soton.ac.uk> lac@ecs.soton.ac.uk (Les Carr) writes: ->Our MacIIci has developed a monitor problem: after a couple of hours ->being left on (usually happens overnight) it switches itself off. ->The Mac itself remains active, and by a lucky stroke I managed to choose ->"Shutdown" from the "Special" menu without any display. ->Because power-cycling the monitor doesn't have any effect, it *looks* as ->though its the Mac's fault (How does it switch the monitor off at shutdown?) ->but we don't see this behaviour when we swap another monitor onto the mac. ->The repair company can spot no fault (as usual). Has anyone seen anything ->like this? We've seen posts like this before, and the problem has happened to me, so maybe the answer should be in the FAQ list. A probable cause of this behaviour is failure of the high voltage multiplier assembly -- either the diodes or (more likely) the capacitors. Replacing the entire assembly (it is a single piece) is the way to go. Marc Kaufman (kaufman@Neon.stanford.edu)