Date: Sat, 03 Nov 2001 16:50:01 +0800 From: Raymond <[EMAIL PROTECTED]> Subject: Re: [LIB] 100CT: Vertical white striping on LCD
At 12:14 AM 3/11/2001 -0800, you wrote: >Date: Sat, 3 Nov 2001 00:08:35 -0800 >From: "Jason Kim" <[EMAIL PROTECTED]> >Subject: Re: [LIB] 100CT: Vertical white striping on LCD > >It doesn't affect the console character-by-character ... it does the exact >same thing it does in high-res mode: colored areas are slightly lighter (as >if by a pattern). That could well be the video buffer memory as well ... remember, at the final stage RAM maps straight to the screen. >Is there any way an LCD could be damaged so that a consistent pattern of >vertical lines appears across the screen? Quite possible ... more likely the screen connector cable though IMHO ... all thats involved in getting to that is removing a single screw that holds the keyboard down. Also try Neil's idea of slightly flexing the motherboard whilst the libby is turned on and seeing if it makes a difference (you'll have to run the libby without the bottom half of the case to do it properly). Whilst you're at it, slightly flex the screen too if you want. Unless your computer has been shocked or something the underlying cause is most likely mechanical, doing this will help you narrow it down. >Another interesting symptom is that on either very dark or very light >colors, this is completely undetectable. Only midtones (like grays) are >affected at all. If one of the connectors is slightly damaged then this would be expected (this is perhaps a simplistic explanation but perhaps something corresponding to the low bit of the horizontal address line may be slightly damaged? That would result in every even or odd pixel being affected depending on which way it was stuck). Very dark colors would not be affected - all off is still all off. Very light colors likewise - the pixels are already close to saturation so for the same difference in signal you don't see much. You'll get most visible difference right in the middle which would correspond to the midtones. Just out of interest, is there any particular hue at which this is most visible? At this stage I'm getting into guesswork but if its across ALL hues then perhaps it might be more a connector or RAM problem where if it was specific hues (or more specifically, if it only affected one of the primary colors - pure red, pure green or pure blue) then it may well be the screen itself (thats because the video data going through that screen cable should still be indexed color, it should only get turned into individual signals for the 3 sets of pixels at the screen end of that cable). - Raymond --- /~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\ | | "Does fuzzy logic tickle?" | | ___ | "My HDD has no reverse. How do I backup?" | | /__/ +-------------------------------------------| | / \ a y b o t | [EMAIL PROTECTED] | | | HTTP://www.raybot.net | | ICQ: 31756092 | Need help? Visit #Windows98 on DALNet! | \~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~/ ************************************************************** http://libretto.basiclink.com - Libretto mailing list http://libretto.basiclink.com/archive - Archives http://www.picante.com/~gtaylor/portable/faq.html - FAQ -------TO UNSUBSCRIBE------- Reply to any of the list messages. The reply mail should be addressed to: [EMAIL PROTECTED] - Then replace any text on the message's subject line: cmd:unsubscribe --------TO UNSUBSCRIBE DIGEST------ Do above but with this on subject line: cmd:unsubscribe digest **************************************************************
