{ "numMessagesInTopic": 8, "nextInTime": 2153, "senderId": "nTkwVmgd-C1F2RmDLRr1V4HANpNDvdX5oH3BhgxuTemep6penwum6SR8Rl0yDmD7-7corA7BzckKBDXkOzLok3FekxNyIdExldsuu9BG", "systemMessage": false, "subject": "Re: VP2290b Flicker", "from": ""educationk12" <educationk12@...>", "authorName": "educationk12", "msgSnippet": "Yeh, I don t know what they mean by a VP2290b-3 at 48Hz. It doesn t exist AFAIK....maybe some Viewsonic executives got an updated version because they didn t", "msgId": 2152, "profile": "educationk12", "topicId": 2145, "spamInfo": { "reason": "6", "isSpam": false }, "replyTo": "LIST", "userId": 247597564, "messageBody": "
>
\n> I know nothing about the VP2290b, so please be gentle with me if I
\n> say something that is way off.
\n>
\n> The vp2290b manual mentions flicker in one instance. It says: "If you
\n> accidentally disconnected the power cord from the main outlet and you
\n> connected it to the outlet again, the screen may flicker
\n> continuously."
\n>
\n> This not to say that you have done the power cord thing, but it shows
\n> that the vp2290b is capable of displaying that behavior.
\n>
\n> The manual can be downloaded from here:
\n> http://www.viewsonic.com/pdf/userguides/vp2290b-1_ug_eng.pdf
\n>
\n> Did you purchase these recently? Could it be that you purchased a
\n> repaired unit? Does it show any signs of having been taken apart and
\n> put back together?
\n>
\n> Again, I know nothing about the VP2290b, but the manual says that to
\n> achieve 41Hz you need a quad input.
\n>
\n> On page 28, on the same manual, it shows that there is a VP2290b
\n> capable of 48Hz: The VP2290b-3 (a.k.a. "med option"). I guess it's
\n> based on the DG5. There's also a VP2290b-2, but I don't know what
\n> it's claim to fame is.
\n>
\n> In my wanderings, I found a site that has service manuals for the
\n> VP2290b. Go here: http://www.eserviceinfo.com/index.php and search on
\n> vp2290b
\n>
\n> CP
\n>
\n> --- In IBM_T2X_LCD@yahoogroups.com, musica1432 <yahoo@> wrote:
\n> >
\n> > Hi,
\n> >
\n> > I now own a couple of VP2290b monitors and am enjoying trying to
\n> get
\n> > sensible output from the various graphics cards I'm trying.
\n> >
\n> > I've tried a Geforce 6800XT, which just causes a system restart
\n> whenever
\n> > I try to get both outputs going to one monitor. A Geforce 6600,
\n> which
\n> > didn't seem to be capable of a high enough resolution. A Geforce
\n> 6600GT,
\n> > which refuses (even when Powerstrip asks) to display 1920x2400 at
\n> any
\n> > refresh rate. Finally, a Radeon X1650 Pro, which is able to achieve
\n> 33Hz
\n> > full-resolution output (using both outputs) if I play with sync-
\n> widths
\n> > and porches, but won't go any higher.
\n> >
\n> > Now for the problem; at 33Hz (or lower frequencies), the display
\n> > flickers. I'm not talking about having slow update rates; I'm
\n> talking
\n> > about getting CRT-like brightening/darkening at about the refresh
\n> rate.
\n> > If I run the monitor at 13Hz, it's especially obvious. Both
\n> monitors
\n> > exhibit this issue. Is this common for a VP2290b? I thought LCD
\n> displays
\n> > were supposed to be immune to this kind of flicker, having no decay
\n> to
\n> > account for.
\n> >
\n> > Also, am I likely to be able to acheive 41Hz if I go for an older
\n> ATI
\n> > card with dual DVI output but not dual-link? And would that solve
\n> the
\n> > flicker problem?
\n> >
\n> > Thanks.
\n> >
\n>