> -----Original Message----- > From: PowerBooks [mailto:powerbooks@;mail.maclaunch.com]On Behalf Of > James Greenidge > Sent: Friday, October 18, 2002 2:21 AM > To: PowerBooks > Subject: Mac Mavens: Re: Strange comb-like lines on PB 190 screen > > > > > > >> After a month of use a strange anomaly has occurred in > the form of > >> thin vertical comb-like lines spaced about 5mm from > another across > >> the full width of the screen and extending up almost > >> exactly half the > > > height of the screen. > > > >This could be one of 2 things, > >1) display cable loose/damaged > >2) screen multiplexer chip faulty > > > >The first one is quite easy to check, ensure that both ends are > >plugged in firmly, and see if the symptoms change when > you flex the > >cable, > >if not then try gently squeezing along the top of the > display housing, > >if this cures it then there is probably a dry joint on one of the > >multiplexer chips. > >If neither help then it is probably new screen time. > >NB it could possibly be Vram but in my experience it is usually the > >screen. > >Ben. > > > > Ben: > > It appears that your "try gently squeezing along the top of > the display housing" (actually along the left screen housing side) > remedy best indicates the possible problem. Right now > that's how I'm > curing the anomaly for several hours relief per. Can you or anyone > define exactly what this "dry joint" is (or why it's called > that); do > you mean a loose chip socket? I'm not squeamish about taking > computers or electronics apart as I often do, so I'd like to go > inside and fix the problem directly. Only thing is the > Apple site has > no schematics of of the PB 190 nor can Google dig up any (going to > need one anyway to install a new far larger HD -- any maven > recommendations?). Can anyone help me here besides a trek > to TekServe? > > Thanks All! > > JimWG
Unfortunately this is not an easy one for most people, the multiplexer chips are either surface mount or more commonly embedded in a plastic film with printed tracks, these are connected to the screen and the interface board, a dry joint is when the solder cracks due to flexing or vibration, it is sometimes possible to re-solder the joint with a VERY fine iron (it helps to work under a binocular microscope). however it could be a damaged track in the flexible ribbon that connects to the screen, this is not easy to fix. another way of approaching the fault that sometimes works, is to identify the exact spot that you need to press on the back of the (dismantled) screen and apply a drop of glue while holding it in place, however this should only be regarded as a temporary fix at best. Ben. -- 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:powerbooks@;mail.maclaunch.com> To unsubscribe, email: <mailto:powerbooks-off@;mail.maclaunch.com> For digest mode, email: <mailto:powerbooks-digest@;mail.maclaunch.com> Subscription questions: <mailto:listmom@;lowendmac.com> Archive: <http://www.mail-archive.com/powerbooks%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
