On 1/11/04 12:59 pm, "J. Burnham" <[EMAIL PROTECTED]> wrote:
> Hi, > > I posted this question a couple of weeks ago and am ready to buy parts so I > wanted to make sure its clarified. > > My iMac Bondi 233mhz is shutting off by itself. The first time I noticed a > problem it was flickering and making an electrical crack sound. When it shut > off for the first time I had to wait a short time and than use the power > button to restart. Yesterday it shut off for a second and came right back on > again. > > So my question is it the analog board (by the way is the flyback part of the > analog board or part of the crt tube), the power supply or something else. > > Also does anyone know if I CAN or CAN'T put in an analog board from a 233, > 266, 333 or does it have to be an exact part number. > > Thank you very much, > > MaxTek > Your problem matches exactly the symptoms of flyback transformer failure. The flyback transformer is located on the analog board. There are 2 types of analog board, they are not interchangeable. Apple's service manual shows how to identify the different types, displaying drawings of the boards. In practice, all 233 MHz iMacs use the same board, and all 333 MHz iMacs I've seen use the type 2 board, completely different and not interchangeable. >From memory, every 266 MHz iMac I've seen has used the same board as the 233, but that doesn't mean some may not. Apple's analog board actually consists of 2 board linked together by wiring, if you replace this complete you will need to run an Apple utility to reset the colour balance, if you don't you may have a colour caste, particularly on darker screens. These settings are stored on the video neck board, this can easily be left on your iMac so you don't have to make these adjustments. All leads remove easily, but if you are unfamiliar with this kind of work be careful removing the focus lead. You will see the side of the holder adjacent to the lead pushes down, allowing the focus lead to be easily pulled out. Forcibly remove the focus lead and you will wreck the board, as the CRT socket can't be obtained as a spare part. Here in the UK it is getting much less viable to undertake this sort of repair, users mainly want to put the money towards an eMac or something better if they have the funds. Steve Bell -- The iMac List is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Refurbished Drives | - Epson Stylus Color 580 Printers - new at $69 | & CDRWs on Sale! | Support Low End Mac <http://lowendmac.com/lists/support.html> iMac List info: <http://lowendmac.com/imac/list.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/imac-list%40mail.maclaunch.com/> --------------------------------------------------------------- >The Think Different Store http://www.ThinkDifferentStore.com ---------------------------------------------------------------
