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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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PC monitor repair help
I have a Samsung 955DF monitor that's ~3 yrs old, and just out of
warranty. After performing flawlessly until now, I've noticed that it drifts out of focus, but only when it's displaying a lots of white. For example, when viewing Web pages with white backgrounds, or black-on-white MS-Word or Excel document, after about 5 minutes I notice it loosing focus. After 20 minutes it's actually painful to look at. The odd thing is that this only occurs when there's large quantities of white on the screen (i.e. backgrounds). I don't notice it with other colors. Also, it doesn't worsen just by virtue of how long the monitor has been on - my initial thinking was that it was heat related (and easy to troubleshoot with a can of freeze spray). It only starts happening when the screen contains lots of white. Thinking about it now, I'm wondering it this is really a focus problem, or if the display is "blooming" over time. At any rate, any ideas where to start looking for the problem? Thanks |
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"Eric Goldsmith" schreef in bericht om... I have a Samsung 955DF monitor that's ~3 yrs old, and just out of warranty. After performing flawlessly until now, I've noticed that it drifts out of focus, but only when it's displaying a lots of white. For example, when viewing Web pages with white backgrounds, or black-on-white MS-Word or Excel document, after about 5 minutes I notice it loosing focus. After 20 minutes it's actually painful to look at. The odd thing is that this only occurs when there's large quantities of white on the screen (i.e. backgrounds). I don't notice it with other colors. Also, it doesn't worsen just by virtue of how long the monitor has been on - my initial thinking was that it was heat related (and easy to troubleshoot with a can of freeze spray). It only starts happening when the screen contains lots of white. Thinking about it now, I'm wondering it this is really a focus problem, or if the display is "blooming" over time. At any rate, any ideas where to start looking for the problem? Thanks Well, Start to check out contrast and brightnes. Especially the brightnes often has been set too high on CRT's. (Both on TV sets and computer monitors.) If focus becomes suspect you'll have to check the focussing voltage along with the brightnes - and contrast voltages. In other words: Find out what changes on the CRT input(s) when you detect a changing in the output. petrus bitbyter --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.771 / Virus Database: 518 - Release Date: 28-9-2004 |
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"Eric Goldsmith" wrote in message om... I have a Samsung 955DF monitor that's ~3 yrs old, and just out of warranty. After performing flawlessly until now, I've noticed that it drifts out of focus, but only when it's displaying a lots of white. For example, when viewing Web pages with white backgrounds, or black-on-white MS-Word or Excel document, after about 5 minutes I notice it loosing focus. After 20 minutes it's actually painful to look at. The odd thing is that this only occurs when there's large quantities of white on the screen (i.e. backgrounds). I don't notice it with other colors. Also, it doesn't worsen just by virtue of how long the monitor has been on - my initial thinking was that it was heat related (and easy to troubleshoot with a can of freeze spray). It only starts happening when the screen contains lots of white. Thinking about it now, I'm wondering it this is really a focus problem, or if the display is "blooming" over time. At any rate, any ideas where to start looking for the problem? Thanks My first guess would be a weak CRT, some Samsung tubes are notoriously short lived, I've seen 1 year old monitors with bad tubes. |
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