OK, here's a subject for your monitor mavens: what does it mean when you heve a cathode ray tube acreen that has been previously fine in displaying color and picture, and it begins to show the following symptoms, in this chronological order:
first it begins to have trouble balancing red to green, showing more red than you have it tuned for [ flesh tones look garish, landscape images look either too vivdly colored or greyed out] than later it begins to slowly oscillate from showing too much red to fading away to too little, ie. a flat background that was set to be beige wanders from hot coral to pastel off white and back again in cycles of several minites duration. at a later point, the brightness or contrast control appears to be growing in magnitude. a setting that previously looked well balanced begins to appear as if the brightness is moving itself higher and higher until the image onscreen looks like a hideously overexposed picture, shot in blinding light. the only measure that corrects it is to tone down both the contrast and brightness to the low, shadowy end of the range, say, about 25 to 30% of a bar representing 100% most recently, the newest manifestation began .. upon activation at turn on, there were flashes of green across the whole screen, and for less than a minute, clear trace lines of the raster zigzagging down the top half of the screen, parallels about an inch apart, horizontally and then diagonally continuously. the lines and the screen were both green; the lines grighter than the background. this was occurring OVER the image the screen was trying to display. today it seems to have progressed still further. upon turn on, the screen flashed intense green, then the lines appeared down the entire screen in parallel zigzags, the background varied back and forth between dimmer, then brighter, then dimmer green tinged, superimposed OVER the image the screen was supposed to be displaying. I can swit this CRT back and forth from TV to computer display. TV shows the effects much worse than computer. when turned to computer display, the screen dalms down after about one minute, and normal color takes over. during TV, the green zigzags appear now and then . I initially thought they had some relationship to loud volume causing vibration of the console, but that hasn't panned out in all cases. then i thought it might be related to changing channels, but that isn't consistent either. last night i thought i heard a kind of crack ing, cricking sound like you would associate with something cooling down and settling. I wondered if temperature changes in the room and the electronics are aggravating this, since i keep it on from mid day, when its warm out, to long past midnight, wehn the room air cools down., I'd say a temperature range of 80� F down to perhaps 55� overnight, with a fanblowing cool air in the window 3 feet from the unit but not blowing staight against it. what am I witnessing here? is it fixable? i believe this CRT is about 10 to 15 years old. if it matters, it has HDTV. and supervideo capability. Is it dying? is something working loose? am I aggravating it with temperature changes? moisture variances? can it be remedied or is it on its way out? janet much thanks. I know you guys have the answers. http://community.webtv.net/mensabrains/BADCODE -- Vintage Macs is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Enter To Win A | -- Canon PowerShot Digital Cameras start at $299 | Free iBook! | Support Low End Mac <http://lowendmac.com/lists/support.html> Vintage Macs list info: <http://lowendmac.com/lists/vintagemacs.shtml> The FAQ: <http://macfaq.org/> Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive: <http://www.mail-archive.com/vintage.macs%40mail.maclaunch.com/> --------------------------------------------------------------- >The Think Different Store http://www.ThinkDifferentStore.com ---------------------------------------------------------------
