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iMac G3 flyback woes
Posted by: naujoks on 2025-05-08 05:53:49
I have an iMac G3 (slot loading) with a dead flyback.
I bought an anlogue board with a flyback, knowing that this flyback might well also be faulty. The previous owner reported getting high voltage but nothing else on his machine.
I put this flyback in my iMac where it displayed the same problems (high voltage, but no other sign of life, no LED). My old flyback gave me no HV, but the power LED would come on for a second.
The replacement flyback did not quite fit the holes on the PCB. Although the PCBs were from the same model Family Number M5521, they were manufactured by different companies and the flybacks are by different manufactures too.

What could I do? Is there anyone offerin flybacks for sale?
Posted by: Daniël on 2025-05-10 11:18:46
Unfortunately, HR Diemen stopped producing the replacement flyback transformers a while ago, and places like Dönberg Electronics and Electronica USA have since depleted their stock. Same for the Trayloaders, I stocked up on those while they still had them for that reason, but I too don't have any for my Slotloaders, should they fail in the future, sadly.
Posted by: naujoks on 2025-05-10 12:11:56
Ahhh so my iMac is really heading to the landfill? 🙁
Posted by: Ljr on 2025-05-12 22:44:04
This one might work for you - https://technotronic-dimensions.3dc...pple-MAC-IMAC-Monitor-flyback-new_p_2102.html I just bought one for my 17inch studio monitor, still need to do the install though.
Posted by: naujoks on 2025-05-12 22:47:44
That's good, but doesn't make sense economically, when working iMacs can be found for $50.
Posted by: cheesestraws on 2025-05-13 00:13:27
Very little of this hobby makes sense economically, let's not pretend we're engaged in investments here in any meaningful way.

If you want that specific machine working, then it will probably cost more than you can currently resell it for to do it. Such is life.

If you don't care much about that specific machine or you won't enjoy the process of fixing it, then pass it on to someone else who will enjoy fixing it and buy a working one.

If you really want to go down the investment logic, buy a working one and intentionally landfill this one and don't let anyone else have it, to reduce the supply of iMac parts.
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