[rescue] Rescued iMacs looking for input on repair

Andrew Weiss ajwdsp at cloud9.net
Wed May 5 12:26:48 CDT 2004

On May 5, 2004, at 12:29 PM, Charles Shannon Hendrix wrote:

> Wed, 05 May 2004 @ 10:38 -0400, Andrew Weiss said:
>> All iMacs from that period have a flyback issue.
>> 233, 333, and 400 DV, DV+, DV SE.  It's the most common age-related
>> failure mode for an all-in-one unit.  Even eMacs have this issue over
>> time.
>> I've replaced over 80 of these boards from several quite disparate
>> models and revisions.
> How much is the board, and how involved is the repair?
> I see a lot of these as near giveaways, I assume because they appear to
> be "dead".
> --  
> shannon "AT" widomaker.com -- ["It's a damn poor mind that can only  
> think
> of one way to spell a word." -- Andrew Jackson]
> _______________________________________________
> rescue list - http://www.sunhelp.org/mailman/listinfo/rescue

The repair is not so involved... just need to be safe about it.  Swap  
the board in and out in like 30 minutes.  Actually I take that back...  
on tray loaders it's really easy.  On slot-loaders it is a Pain in the  

Boards are like $100-130 sometimes as high as $200 from an Apple Parts  
source... make sure you get the exact part number you need.  This is  
the 661 prefixed number not the part number on the part.  Get it from  
the manual.

If people have serial numbers of the computer or descriptions of the  
board I can help.  The board is either green or beige in the tray  
loaders.  In Slot loaders you look for logos and the presence or lack  
thereof of a Tube switch.  IF the switch exists... make sure it is set  
for the tube type.

After that... it's a matter of sitting down with the adjustments  
chapter and the Apple Display utility and a light meter and  
re-calibrating the new board's screen voltage, cutoff, and drive  
values.  With the DV boards one also needs to use the jumper adjustment  
tool to save these adjustments to the board's NVRAM.  It's just a wire  
from the ground pin on the neck board to the chassis.


and remember: a CRAY is the only computer
that runs an endless loop in just four hours ...  --Snarfed from a forum

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