Thread View: comp.sys.zenith.z100
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4 total messages
Started by Philip Arny
Tue, 15 Dec 1992 00:19
flickering video on z100
Author: Philip Arny
Date: Tue, 15 Dec 1992 00:19
Date: Tue, 15 Dec 1992 00:19
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I've got a z100 low profile unit; a few days ago, the screen started "shimmying" around; it's worst right after power up, but it continues as the machine runs & warms up. Any suggestions as to probable causes? I've got a spare system & monitor to try parts swapping on... Thanks! Philip Arny parny@u.washington.edu
Re: flickering video on z100
Author: Elizabeth A. Weise
Date: Tue, 15 Dec 1992 13:25
Date: Tue, 15 Dec 1992 13:25
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In article <1992Dec15.001931.15612@u.washington.edu> parny@stein.u.washington.edu (Philip Arny) writes: >I've got a z100 low profile unit; a few days ago, the screen started >"shimmying" around; it's worst right after power up, but it continues as >the machine runs & warms up. Any suggestions as to probable causes? >I've got a spare system & monitor to try parts swapping on... I noticed this on both my standard green screen and a Tandy CM5 color monitor - just after I put an external modem on top of the Z, right next to the monitor. Do you have anything with a transformer nearby? Other than that, I did have an aging problem with my green monitor - horizontal drive would blink out occasionally, and only a good whack would cure it.. then that stopped working. I ended up resoldering the flyback transformer to the main PC board - because of the weight it had worked a bit loose. I also tried swapping guts (all but the tube) with another monitor I had bought surplus (with really bad screen burn-in) and that worked, for a while, till the same transformer problem attacked it. Hope this all helps! -- Tom Moeller, under the guise of -- -- **************************************************************************** Beth Weise / PhD Student / Dept. of Language, Literature, & Communication Rensselaer Polytechnic Institute / Troy, New York Weisee@rpi.edu / Beth_Weise@mts.rpi.edu
Re: flickering video on z100
Author: Tim McCaffrey
Date: Wed, 16 Dec 1992 00:15
Date: Wed, 16 Dec 1992 00:15
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I would try replacing the monitor. It sounds to me like an internal oscillator is going in the monitor. If another monitor exhibits the same behaviour, I would look for some external factor, like an unsheilded speaker or motor near the monitor (with 3 feet). The last thing I would check is the power supply on the Z110. Good Luck. Tim McCaffrey Z100 programmer at large.
Re: flickering video on z100
Author: The Gern
Date: Thu, 17 Dec 1992 13:45
Date: Thu, 17 Dec 1992 13:45
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>I've got a z100 low profile unit; a few days ago, the screen started >"shimmying" around; it's worst right after power up, but it continues as >the machine runs & warms up. Any suggestions as to probable causes? >I've got a spare system & monitor to try parts swapping on... > Try wiggling the video cable and or pinching the RCA (if it is a monochrome problem) tighter. Swapping parts is the true test here. Yes, I have spare tested video boards 64K color for $15 plus $5 ship if you need one. $10 for 64K green. Cheers, Gern
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