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Apple Computing Products:
macOS - Desktop Hardware
iMac A1225 EMC 2267 power supply (voltage, start)
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<blockquote data-quote="MrSoul" data-source="post: 1829154" data-attributes="member: 403240"><p>Hello,</p><p></p><p>Fortunately, the iMac's power system is simpler, they don't have to switch between the battery and a potential faulty or counterfeit charger.</p><p></p><p>And no, unfortunately, I couldn't find any technical documentation on iMac power supplies of this generation<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3" alt=":(" title="Frown :(" loading="lazy" data-shortname=":(" /></p><p>If ever a reputable soul has good technical sources, the power supply is a Delta ADP-250AF B.</p><p></p><p>Otherwise, I made some progress in my tests, I managed to activate the power supply!</p><p></p><p>It is sufficient to make a bridge between the ground (PIN 1,6,7,12) and the 3.3V (PIN 4), which activates pins 8, 9, 10</p><p></p><p>So we end up with these values:</p><p></p><p>On the 12V output (2x6 pins)</p><ul> <li data-xf-list-type="ul">Pin 1 = GND</li> <li data-xf-list-type="ul">Pin 2 = 12VDC -> Always On</li> <li data-xf-list-type="ul">Pin 3 = GND -> if SATA connected (creates a bridge with the last 1pin connector of the power supply)</li> <li data-xf-list-type="ul">Pin 4 = 3.3VDC -> Always On -> PS_ON</li> <li data-xf-list-type="ul">Pin 5 =?</li> <li data-xf-list-type="ul">Pin 6 = GND</li> <li data-xf-list-type="ul">Pin 7 = GND</li> <li data-xf-list-type="ul">Pin 8 = 12VDC -> If On</li> <li data-xf-list-type="ul">Pin 9 = 12VDC -> If On</li> <li data-xf-list-type="ul">Pin 10 = 12VDC -> If On</li> <li data-xf-list-type="ul">Pin 11 =?</li> <li data-xf-list-type="ul">Pin 12 = GND</li> </ul><p></p><p>On the 24v output (1x12 pins)</p><ul> <li data-xf-list-type="ul">Pin 1 = 24VDC -> Always On</li> <li data-xf-list-type="ul">Pin 2 = 24VDC -> Always On</li> <li data-xf-list-type="ul">Pin 3 = 24VDC -> Always On</li> <li data-xf-list-type="ul">Pin 4 = 24VDC -> Always On</li> <li data-xf-list-type="ul">Pin 5 = 24VDC -> Always On</li> <li data-xf-list-type="ul">Pin 6 = GND</li> <li data-xf-list-type="ul">Pin 7 = GND</li> <li data-xf-list-type="ul">Pin 8 = GND</li> <li data-xf-list-type="ul">Pin 9 = GND</li> <li data-xf-list-type="ul">Pin 10 = GND</li> <li data-xf-list-type="ul">Pin 11 =?</li> <li data-xf-list-type="ul">Pin 12 =?</li> </ul><p>A last connector is present on the power supply, it is a ground that seems to be dedicated to the 5V (it is connected to one of the SATA GNDs and to the motherboard).</p><p></p><p>We can see that this power supply only provides 12V and 24V, as surprising as it may seem, it is the motherboard that is in charge of transforming the 12V into 5V! (the cable between the power supply, the motherboard and the hard disk confirms it).</p><p></p><p>So I still have Pin 5 and 11 on the 12V port and Pin 11 and 12 on the 24V port which are a mystery.</p></blockquote><p></p>
[QUOTE="MrSoul, post: 1829154, member: 403240"] Hello, Fortunately, the iMac's power system is simpler, they don't have to switch between the battery and a potential faulty or counterfeit charger. And no, unfortunately, I couldn't find any technical documentation on iMac power supplies of this generation:( If ever a reputable soul has good technical sources, the power supply is a Delta ADP-250AF B. Otherwise, I made some progress in my tests, I managed to activate the power supply! It is sufficient to make a bridge between the ground (PIN 1,6,7,12) and the 3.3V (PIN 4), which activates pins 8, 9, 10 So we end up with these values: On the 12V output (2x6 pins) [LIST] [*]Pin 1 = GND [*]Pin 2 = 12VDC -> Always On [*]Pin 3 = GND -> if SATA connected (creates a bridge with the last 1pin connector of the power supply) [*]Pin 4 = 3.3VDC -> Always On -> PS_ON [*]Pin 5 =? [*]Pin 6 = GND [*]Pin 7 = GND [*]Pin 8 = 12VDC -> If On [*]Pin 9 = 12VDC -> If On [*]Pin 10 = 12VDC -> If On [*]Pin 11 =? [*]Pin 12 = GND [/LIST] On the 24v output (1x12 pins) [LIST] [*]Pin 1 = 24VDC -> Always On [*]Pin 2 = 24VDC -> Always On [*]Pin 3 = 24VDC -> Always On [*]Pin 4 = 24VDC -> Always On [*]Pin 5 = 24VDC -> Always On [*]Pin 6 = GND [*]Pin 7 = GND [*]Pin 8 = GND [*]Pin 9 = GND [*]Pin 10 = GND [*]Pin 11 =? [*]Pin 12 =? [/LIST] A last connector is present on the power supply, it is a ground that seems to be dedicated to the 5V (it is connected to one of the SATA GNDs and to the motherboard). We can see that this power supply only provides 12V and 24V, as surprising as it may seem, it is the motherboard that is in charge of transforming the 12V into 5V! (the cable between the power supply, the motherboard and the hard disk confirms it). So I still have Pin 5 and 11 on the 12V port and Pin 11 and 12 on the 24V port which are a mystery. [/QUOTE]
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Apple Computing Products:
macOS - Desktop Hardware
iMac A1225 EMC 2267 power supply (voltage, start)
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