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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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ViewSonic P225f Horizontal Shrinks & Expands
I'm glad I found this newsgroup after using search and finding a topic about
the P225f here [1]. I hope somebody has some insight and can respond. I am using two monitors with XP Pro SP2 driven by an older ATI adapter. As I recall -- perhaps incorrectly as I am a burnout ;-) -- I updated the ATI drivers after first seeing the anomaly but the anomaly persists sporadically on an irregular basis. One monitor is a ViewSonic 17 configured as 'monitor 2' and is rock solid and stable. The other monitor is the ViewSonic P225f configured as 'monitor 1' which for the last six months or so -- again, time flies and may be up to a year now -- the display shrinks in the horizontal and then re-expands about 5-20 pixels or so on each side. This shrinking and expanding occurs sporadically and may not be present on any given day. Other times, it occurs several times within a given hour and then stops. Each shrink-expansion is microseconds in duration and may repeat 3-5 times and then stops only to begin again minutes later. Very irregular and sort in duration is what I'm trying to convey. I have several white box computers and peripherals getting power through an old switching power supply I pulled from a PDP-11 I bought an an auction. That PDP-11 supply has 12 outlets and gets its power from the wall on an ordinarly residential circuit. No other equipment displays any type of power anomaly. Besides the two monitors, the PDP-11 serves the 12 volt adapters for firewall, keyboard/mouse/monitor switch box, and so on. I've run out of outlets on the PDP-11 device and have a TrippLite power strip plugged into the PDP-11 device as well. I'm wondering if the power supply on the P225f is going bad and I'm wondering if the power supply is going bad if it can be replaced in its entirety. What is the economic value as opposed to buying a new monitor? What would a repair do for me? Finally, I'm wondering if those in the know may know if this anomaly may be resolved by getting cleaner power to the P225f? Would the use of an APC UPS for example give me cleaner power? This is a lot to respond to. I hope somebody can take the time... %= Clinton Gallagher [1] http://sci.tech-archive.net/Archive/...4-08/0698.html |
#2
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This is a lot to respond to. I hope somebody can take the time... It sounds like a bad monitor. p.s. how can you see a microsecond event? ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
#3
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My generic 17" V773 (Optiquest/Viewsonic) does the exact same thing you
are describing. It rarely occurs and for the most part it doesn't bother me. Except for that obviously it shouldn't be doing that at all and I have no idea if it is a symptom of something more serious. (BTW, I have a totally different kind of set up than do you so I doubt that your set up is to blame.) clintonG wrote: I'm glad I found this newsgroup after using search and finding a topic about the P225f here [1]. I hope somebody has some insight and can respond. I am using two monitors with XP Pro SP2 driven by an older ATI adapter. As I recall -- perhaps incorrectly as I am a burnout ;-) -- I updated the ATI drivers after first seeing the anomaly but the anomaly persists sporadically on an irregular basis. One monitor is a ViewSonic 17 configured as 'monitor 2' and is rock solid and stable. The other monitor is the ViewSonic P225f configured as 'monitor 1' which for the last six months or so -- again, time flies and may be up to a year now -- the display shrinks in the horizontal and then re-expands about 5-20 pixels or so on each side. This shrinking and expanding occurs sporadically and may not be present on any given day. Other times, it occurs several times within a given hour and then stops. Each shrink-expansion is microseconds in duration and may repeat 3-5 times and then stops only to begin again minutes later. Very irregular and sort in duration is what I'm trying to convey. I have several white box computers and peripherals getting power through an old switching power supply I pulled from a PDP-11 I bought an an auction. That PDP-11 supply has 12 outlets and gets its power from the wall on an ordinarly residential circuit. No other equipment displays any type of power anomaly. Besides the two monitors, the PDP-11 serves the 12 volt adapters for firewall, keyboard/mouse/monitor switch box, and so on. I've run out of outlets on the PDP-11 device and have a TrippLite power strip plugged into the PDP-11 device as well. I'm wondering if the power supply on the P225f is going bad and I'm wondering if the power supply is going bad if it can be replaced in its entirety. What is the economic value as opposed to buying a new monitor? What would a repair do for me? Finally, I'm wondering if those in the know may know if this anomaly may be resolved by getting cleaner power to the P225f? Would the use of an APC UPS for example give me cleaner power? This is a lot to respond to. I hope somebody can take the time... %= Clinton Gallagher [1] http://sci.tech-archive.net/Archive/...4-08/0698.html |
#4
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"Richy" bravely wrote to "All" (05 Sep 05 20:45:10)
--- on the heady topic of " ViewSonic P225f Horizontal Shrinks & Expands" Yes, you both might have a burning yoke socket. The solder quality on the underside of the socket is sometimes unsatifactory as it leaves the factory. This problem is similar with the FBK because of the large pins but one will often see the FBK pins were redone by hand. Not so often the yoke socket unfortunately and these will burn up eventually. It can then cause things like a shorted HOT, damaged width circuits, and even zapped logic circuits sometimes. I saw a hole the size of a quarted burned in a circuit board around the yoke socket. That one must have set off the fire alarm. It sure stank to high heaven when I dug into it. A*s*i*m*o*v Ri From: Richy Ri Xref: core-easynews sci.electronics.repair:341427 Ri My generic 17" V773 (Optiquest/Viewsonic) does the exact same thing Ri you are describing. It rarely occurs and for the most part it doesn't Ri bother me. Except for that obviously it shouldn't be doing that at all Ri and I have no idea if it is a symptom of something more serious. (BTW, Ri I have a totally different kind of set up than do you so I doubt that Ri your set up is to blame.) Ri clintonG wrote: I'm glad I found this newsgroup after using search and finding a topic about the P225f here [1]. I hope somebody has some insight and can respond. I am using two monitors with XP Pro SP2 driven by an older ATI adapter. As I recall -- perhaps incorrectly as I am a burnout ;-) -- I updated the ATI drivers after first seeing the anomaly but the anomaly persists sporadically on an irregular basis. One monitor is a ViewSonic 17 configured as 'monitor 2' and is rock solid and stable. The other monitor is the ViewSonic P225f configured as 'monitor 1' which for the last six months or so -- again, time flies and may be up to a year now -- the display shrinks in the horizontal and then re-expands about 5-20 pixels or so on each side. This shrinking and expanding occurs sporadically and may not be present on any given day. Other times, it occurs several times within a given hour and then stops. Each shrink-expansion is microseconds in duration and may repeat 3-5 times and then stops only to begin again minutes later. Very irregular and sort in duration is what I'm trying to convey. I have several white box computers and peripherals getting power through an old switching power supply I pulled from a PDP-11 I bought an an auction. That PDP-11 supply has 12 outlets and gets its power from the wall on an ordinarly residential circuit. No other equipment displays any type of power anomaly. Besides the two monitors, the PDP-11 serves the 12 volt adapters for firewall, keyboard/mouse/monitor switch box, and so on. I've run out of outlets on the PDP-11 device and have a TrippLite power strip plugged into the PDP-11 device as well. I'm wondering if the power supply on the P225f is going bad and I'm wondering if the power supply is going bad if it can be replaced in its entirety. What is the economic value as opposed to buying a new monitor? What would a repair do for me? Finally, I'm wondering if those in the know may know if this anomaly may be resolved by getting cleaner power to the P225f? Would the use of an APC UPS for example give me cleaner power? This is a lot to respond to. I hope somebody can take the time... %=3d Clinton Gallagher [1] http://sci.tech-archive.net/Archive/...4-08/0698.html .... You mean 15" sparks are SUPPOSED to come out of this thing?!? |
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