While I myself have set up Neck A, a reader of my blog has gotten it working with neck B. Even the Clock/Data cables are reversed White/Black. The order of the rest of the wires is completely different. There are so many differences, there is a Brown cable in one, an Orange in the other. As both are left floating, it doesn't matter for the inverter, however, I can now have doubts if this can be used to differentiate the two necks. As I obtained this second hand, this could have been the result of a repair and may not be standard.
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*** I have come across a neck that has the LCD cable of a 800mhz iMac, however, its inverter cable has an orange wire. NECK A: This is part #661-2825 and is the for the 1ghz and 1.25ghz 17" iMac G4. My previous post/17" pinout detailed what I will call: Because they all use the same LCD, the pin number/position will always be the same. Remember, you always have the option of opening up the monitor and looking at the JAE connector. Other variations or small differences may exist, I can not be certain. These are the only two part numbers for 17" necks I have been able to find. They are also VERY DIFFERENT - so know which one you are using before proceeding. So I have fairly intact versions of both of the 17" necks and they are VERY EASY to tell apart - even if you don't know which 17" iMac the neck originally came from. Please note the charts have been corrected to reflect that RED is connected directly to 5V for both 17" iMac necks. Thank you to my readers and my apologies for any inconvenience.
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I made a mistake when putting together the Inverter diagram for the blog. I initially thought there was some inverter variation but after another confirmation from a reader I checked my old notes and had clearly written "Red - 5V". As I noted earlier, a reader noted flickering of the backlights with 12V connected to the RED line and it stabilized when connected to 5V.
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*NOTE: The Inverter Charts have been updated.