Are diagrams of the late 2009 iMac power supply available for modifying my hardware?

I am trying to mod an old iMac 21" late 2009 with an Intel CPU and repurpose it as a monitor. I was hoping to find the PSU pinout, which is a 14 pin one. My further goal is to allow the button on the back to turn on the PSU. So far I have identified: 1. GND in pins 01, 08, 07, 14. 2. 3.7V in pin06. 3. 12V in pin04. This is on a turned off PSU, connected to AC. I have to mention here that the pin06 is not connected to the motherboard connector but to the jst4 that is connected to the LCD controller. Here with your help I have found a pin guide: - PSU/logic board pinout voltages Pin12 suggests that it is waiting for a signal from the logic board, possibly the 3.7V on Jst4. I tried connecting the 3.7V via a 1K resistor to pin 12 but nothing happened, voltages across the pinhead remained the same. The momentary switch has a very small resistance about 24ohm. Will I need some additional circuitry, like a transistor, to accomplish the turn on. Is there any other resource for finding how to mod this iMac and use its PSU?