On 4/3/03 Kai wrote: >you certainly remember the longer continuing Powerbook darkening border >discussion I initiated a several days ago... I hope You won't think: >"Almighty! That guy again" ;) > >But I got some interesting news: I've purchased a used dual scan color >display for my powerbook 540. The first moment after I had assembled the new >display I thougt: Cool! It works. But only a few seconds after the Powerbook >was running a new problem started. The display started to get more and more >vertical different colored lines. They got more and more the longer the >Powerbook was running. > >Now I'm very confused. Somehow it seems to be the same like with my old b/w >active matrix display (the growing darkening borders). The difference: now >it's a dual scan color display. and colored lines are getting more and more. > >Maybe I'm wrong. But it seems as if it's not directly a problem with the >display but more with any part of the board. I've also completely >disassembled the Powerbook and checked and changed nearly all connector >cables. But the problem still remained. > >Well, now I'm kind of frustrated. Any ideas?
Well, maybe you are on to something, then again, maybe not. Read this in the meantime . . . >From an Apple page describing LCD theory: "Black areas on the LCD screen represent those points where the transparent electrode layers delivered a charge to the liquid crystals, causing them to align vertically, and allowing the vertically oriented light wave to pass through, only to be blocked by the horizontally oriented front polarizer layer. No light has succeeded at passing through at those points." The page goes on to say that light areas are where no charge is applied. 'K? So what I learned is that dark areas are receiving too much juice, or perhaps in the case of our mono TFT edge-darkening, where the liquid crystals are _more_sensitive_ . . . Boy ain't it great to be so ignorant, it leaves me with so much still to learn! <G> Not a mono TFT PB500, but close enough . . . I've got a _good_ Duo 250 TFT display I'm going to try on my 2300, which with a previous 280 TFT screen had done the darkening corner thing. If the 250 screen now suddenly exhibits darkening corners, it'd be a good bet that something on the LB is to blame, rather than the display itself. Of course, I'm really hoping I've finally gotten a usable mono TFT 'Book! I'll report back once I get a chance to do the test. Dan K -- PowerBooks 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> PowerBooks list info: <http://lowendmac.com/lists/powerbooks.shtml> --> AOL users, remove "mailto:"; 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/powerbooks%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
