Path: utzoo!mnetor!uunet!yale!cmcl2!acf8!movshon From: movshon@acf8.UUCP (Tony Movshon) Newsgroups: comp.sys.dec.micro Subject: Re: Flickering Rainbow Screen Message-ID: <21880004@acf8.UUCP> Date: 19 Mar 88 23:17:00 GMT References: Organization: New York University Lines: 28 Jim O'Brien worries about flicker on his Rainbow screen. I have occasionally experienced a jitter which seems to be a pure video problem within the VR201 monitor, and has nothing to do with the power supply connector. If you feel venturesome, you can open the VR201 and make sure that everything within is well-seated -- it's pretty shabbily made inside and I wouldn't be at all surprised to find a bad contact of some kind. Once you have the monitor open, by the way, it often pays to adjust the screen brightness, focus and geometry using the marked presets, because these are often badly mis-adjusted. It's also possible that the jitter (if it's the purely-horizontal character jitter that I have seen), comes from a dirty preset pot, which you can tackle at the same time. The usual cautions: don't mess around inside a video monitor unless you have some idea how to deal with high-voltage electronics. But don't pay DEC to work on your VR201, either -- I've never found a DEC service tech willing to go inside the monitor; they just replace 'em. Comes from being trained on 5-volt electronics, I guess. Tony Movshon Internet: movshon@nyu.edu Usenet: movshon@cmcl2.uucp or {ihnp4|allegra}!cmcl2!xp!tony US Mail: Department of Psychology, NYU 6 Washington Place, room 1083 New York, NY 10003 Phone: (212) 998-7880