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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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#1
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Viewsonic P225F horizontal failure
Got a P225F flat CRT monitor brought over this weekend with the horizontal
compressed into a band about 1/4" wide from top to bottom. HOT checks out ok, found a 0.8A plastic cased micro fuse that's blown, everything else I've checked so far looks ok. Anybody deal with this one before? I'm tempted to replace the fuse and see what happens, but I expect it to blow again. |
#2
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Viewsonic P225F horizontal failure
You probably have a bad HOT and P-FET 2sj306 that is shorted as well.
Phil "James Sweet" wrote in message ... Got a P225F flat CRT monitor brought over this weekend with the horizontal compressed into a band about 1/4" wide from top to bottom. HOT checks out ok, found a 0.8A plastic cased micro fuse that's blown, everything else I've checked so far looks ok. Anybody deal with this one before? I'm tempted to replace the fuse and see what happens, but I expect it to blow again. |
#3
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Viewsonic P225F horizontal failure
"Phil Durgin" wrote in message hlink.net...
You probably have a bad HOT and P-FET 2sj306 that is shorted as well. Phil "James Sweet" wrote in message ... Got a P225F flat CRT monitor brought over this weekend with the horizontal compressed into a band about 1/4" wide from top to bottom. HOT checks out ok, found a 0.8A plastic cased micro fuse that's blown, everything else I've checked so far looks ok. Anybody deal with this one before? I'm tempted to replace the fuse and see what happens, but I expect it to blow again. ________________ This a general suggestion for anyone owning or desiring to own an LCD flat monitor, including James: The following suggestions may seem valid only for traditional CRT monitors & TVs, but heat is heat, and brighter generates more of the same. 1. Where are your brightness/contrast settings? If they look something like this: Min.IIIIIIIIIIIIIIIIII Max, TURN THEM DOWN!! I usually keep my Brightness at the middle, and my contrast a little higher. 2. Explore your color driver section. Some mfgs crank their R, G, B drives to the max. If this is your case, pull them all back to about the middle. If one is more than the other, pull them all back in the same ratio. IE: R Min.IIIIIIIIIIIIIIIII Max. G Min.IIIIIIIIIIIIII Max. B Min.IIIIIIIIIIIIII Max. Pull them back as follows: R Min.IIIIIIIIII Max. G Min.IIIIIIIII Max. B Min.IIIIIIIII Max. (All of the above depends on your specific menus of course!) 3. If you have a "Color Temperature" menu option, set it to 6500K instead of 8000 or whatever the higher(hotter) setting is. Although if you adjust #1 and #2 individually, Color Temp may display "USER" which is fine. All of this will have the effect of a deeper, richer image. It WILL seem darker to you at first, but remember, "Brighter ain't always better". What you will be seeing is more representative of real life. IE if your wallpaper is a baseball stadium at night, it should LOOK like a stadium at night, not like a stadium at twilight. The sky over NYC should be a rich light blue, not whiteish turquoise, and any shadows on the buildings's setbacks should be a dark gray, not ashen. If you are watching a DVD, the image should convey *most* of the director's intentions. Finally, it will also add significantly to the life of your monitor, whether CRT, Plasma, or LCD. regards, CC |
#5
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Viewsonic P225F horizontal failure
"ChrisCoaster" wrote in message om... "Phil Durgin" wrote in message hlink.net... You probably have a bad HOT and P-FET 2sj306 that is shorted as well. Phil "James Sweet" wrote in message ... Got a P225F flat CRT monitor brought over this weekend with the horizontal compressed into a band about 1/4" wide from top to bottom. HOT checks out ok, found a 0.8A plastic cased micro fuse that's blown, everything else I've checked so far looks ok. Anybody deal with this one before? I'm tempted to replace the fuse and see what happens, but I expect it to blow again. ________________ This a general suggestion for anyone owning or desiring to own an LCD flat monitor, including James: The following suggestions may seem valid only for traditional CRT monitors & TVs, but heat is heat, and brighter generates more of the same. 1. Where are your brightness/contrast settings? If they look something like this: Min.IIIIIIIIIIIIIIIIII Max, TURN THEM DOWN!! I usually keep my Brightness at the middle, and my contrast a little higher. 2. Explore your color driver section. Some mfgs crank their R, G, B drives to the max. If this is your case, pull them all back to about the middle. If one is more than the other, pull them all back in the same ratio. IE: R Min.IIIIIIIIIIIIIIIII Max. G Min.IIIIIIIIIIIIII Max. B Min.IIIIIIIIIIIIII Max. Pull them back as follows: R Min.IIIIIIIIII Max. G Min.IIIIIIIII Max. B Min.IIIIIIIII Max. (All of the above depends on your specific menus of course!) 3. If you have a "Color Temperature" menu option, set it to 6500K instead of 8000 or whatever the higher(hotter) setting is. Although if you adjust #1 and #2 individually, Color Temp may display "USER" which is fine. All of this will have the effect of a deeper, richer image. It WILL seem darker to you at first, but remember, "Brighter ain't always better". What you will be seeing is more representative of real life. IE if your wallpaper is a baseball stadium at night, it should LOOK like a stadium at night, not like a stadium at twilight. The sky over NYC should be a rich light blue, not whiteish turquoise, and any shadows on the buildings's setbacks should be a dark gray, not ashen. If you are watching a DVD, the image should convey *most* of the director's intentions. Finally, it will also add significantly to the life of your monitor, whether CRT, Plasma, or LCD. regards, CC All good advice, but what's this have to do with my post? This is a CRT monitor that I'm repairing for someone else, I can advise them how to configure it but in the end that's their business, all I need to do is make it work. |
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