hartzell@boulder.colorado.edu (George Hartzell) (03/26/90)
Two of the 19" monochrome DECstation 2100s that I support have an annoying flicker on the screen (6 19" mono 2100's, and one 15" mono 3100 don't have this problem). One has had it since we opened the box, and another just developed it. The flicker is reminiscent of the snow one gets on a PC when writing directly to the video memory without proper attention to timing. It doesn't always happen, sometimes powering the machine down, counting to 5, and rebooting will make the problem go away. I have return to factory service on these, so I've been sending parts back one at a time from the DOA system to try to fix it. So far I've sent back (in chronological order) the motherboard, the video ram, and just last week the power supply. Replacing neither the motherboard nor the video ram fixed the problem. Neither did swapping video cables with one of my "good" systems. I really don't think that the power supply is the culprit, but didn't know what else to try. Has anyone out there seen this problem? How did you fix it? g. George Hartzell (303) 492-4535 MCD Biology, University of Colorado-Boulder, Boulder, CO 80309 hartzell@Boulder.Colorado.EDU ..!ncar!boulder!hartzell
sritacco@hpdmd48.HP.COM (Steve Ritacco) (03/29/90)
I have noticed some flicker on a monochrome DECstation 2100, I just assumed it was normal. Is the "snow" being refered to something different? To my eyes, I just thought that I was able to see the refresh, though this is surprising. The flicker I can see is not particularly annoying.
sritacco@hpdmd48.HP.COM (Steve Ritacco) (03/29/90)
Oh, and does anyone know what the refresh rate is on these machines???
hartzell@boulder.Colorado.EDU (George Hartzell) (03/30/90)
In article <15500007@hpdmd48.HP.COM>, sritacco@hpdmd48 (Steve Ritacco) writes: >I have noticed some flicker on a monochrome DECstation 2100, I just assumed >it was normal. Is the "snow" being refered to something different? >To my eyes, I just thought that I was able to see the refresh, though this >is surprising. The flicker I can see is not particularly annoying. The snow that I am seeing is different from refresh. It is *very* annoying. g. George Hartzell (303) 492-4535 MCD Biology, University of Colorado-Boulder, Boulder, CO 80309 hartzell@Boulder.Colorado.EDU ..!ncar!boulder!hartzell