Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!wuarchive!uunet!bonnie.concordia.ca!ccu.umanitoba.ca!bright From: bright@ccu.umanitoba.ca (Bob Bright) Newsgroups: comp.sys.atari.st.tech Subject: Re: Help!! Monitor screen "shakes" Message-ID: <1991Apr29.181857.19884@ccu.umanitoba.ca> Date: 29 Apr 91 18:18:57 GMT References: <1991Apr28.215931.8719@lynx.CS.ORST.EDU> Organization: University of Manitoba, Winnipeg, Canada Lines: 32 In article <1991Apr28.215931.8719@lynx.CS.ORST.EDU> vovut@prism.cs.orst.edu writes: >I'm having more problems with my monochrome monitor again. A few weeks >ago my monitor "died". Luckily a few people on the network informed >me that all I had to do was to replace several diodes. I did that >and it has worked fine. > >A few days ago the picture started to "shake". The entire screen >vibrates, with the left side being more noticeable. Have you relocated your system/monitor, or placed any new equipment in the vicinity? The SM124 is _extremely_ sensitive to magnetic fields. Even a small magnet placed next to the monitor will sometimes cause an annoying jitter in the display; a small flourescent lamp next to the monitor will cause it to go crazy. When I first got my ST the display sometimes jittered and it took me two months to track down the source of the problem. There was nothing in my office that made any difference, and no wiring buried in the wall, etc.; but the jitters got really bad whenever a guy on the other side of the building turned on his electric heater. It turned out that the electrical service for the building was on the wall _outside_ my office, about 1-1/2 feet from my monitor, and the heater was drawing enough extra current through the service to cause the problem. Anyway, try moving your monitor to the center of the room or something like that to rule out magnetic interference. BBB -- Bob Bright Dept. of Philosophy University of Manitoba Winnipeg, Man R3T 2N2 (204) 474-9105