Emac display color misalignment

i have an 800 mhz superdrive emac and i recently upgraded the harddrive from 60 to 320 gb. after installing the harddrive and starting up the computer i noticed that the moniter was all screwed up. it looks like all the colors are seperated and they are misaligned. the blue color is all shifted up slightly, and the red in another direction. any ideas what causes/ how i can fix this? my idea is i either touched something i shouldnt have while replacing the harddrive, or the case is putting pressure on the crt somehow

any help is appreciated

thanks in advance

emac 800 mhz superdrive, Mac OS X (10.2.x)

Posted on Jan 27, 2008 7:52 PM

Reply
6 replies

Jan 28, 2008 11:35 AM in response to Swicano

Swicano,

Welcome to the Apple Discussions!

If the replacement HD case is slightly thicker than the original (i.e., not explicitly a slimline case), it can indeed cause problems; there's very little space margin in the eMac design. It's also possible that the replacement drive is improperly shielded and is causing interference. You may want to try swapping th original 60GB HD back in(assuming it's still good) and try putting the 320GB drive in an external Firewire enclosure (see PT: HD drive replacement tips). If that works, you can then move your user data to the external drive and use the internal just for the OS itself.
iTunes: Moving your iTunes Music folder
iPhoto: How to move the iPhoto Library Folder

Feb 5, 2008 8:03 AM in response to Swicano

Hey Guys,

i noticed that the moniter was all screwed up. it looks like all the colors are seperated and they are misaligned. the blue color is all shifted up slightly, and the red in another direction. any ideas what causes/ how i can fix this?

You know when I first saw this post my first thought was it was a yoke control problem, specifically a deflection yoke problem.
I have worked on this but I don't recommend it since each deflection yoke you change will change all the others. Normally it's a factory adjustment and then it's solidified in place.

Richard

Apr 7, 2008 7:32 PM in response to Swicano

i was lookign around the internet and i found an article about old crt tvs and the manual convergence tools they had on them and i remembered bumping into the i guess yokes yuo call them on this thread, i must have misaligned them, so i just turned the computer back on with the cover off and realigned them manually, mine were pretty easy to move around. it solved my problem perfectly, i wish i could remember the sites name, but it was a long time ago. thanks for all the help and advice offered

Apr 12, 2008 8:17 AM in response to Swicano

Hey Swic,
OK good for you! I hope you were very careful while you were around the back of the CRT neck. There are many nasty voltages there.
In the old days when we'd do that to monitors at the TV station, we'd use a mirror so we could see what was happening.
BTW usually those "adjustment yokes" actually purity and convergence adjustments are marked as Sam notes:
http://www.repairfaq.org/sam/tvfaq.htm
"The position and orientation of the yoke (including pitch and yaw) and magnet assembly (purity and static convergence rings, if used) are critical. Use paint or White-Out(tm) to put a stripe across all of the magnet rings so you will know their exact positions should they accidentally shift later. If there are rubber wedges between the yoke and the funnel of the tube, assure that they are secure. Tape them to be doubly sure as adhesive on old tape dries up with age and heat and becomes useless. This will avoid the need for unecessary dynamic convergence adjustments after reassembly."
Some of them will also have a nut that locks those adjustments in place but as Sam says did you see the painted stripe?
mine were pretty easy to move around.

See that shouldn't be the case.
Richard

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Emac display color misalignment

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