Info about power supply

Hello. I have taken the PSU out of an iMac model A1207. The output connector of the power supply has five pins. I found out that the pinout is

1 (grey): +12V

2 (grey): +12V

3 (black): GND

4 (black): GND

5 (brown): PFW.

However the logic board needs +12 V, +5 V, +3.3V and maybe -12 V in order to work. In some older iMac models there was a DC-DC converter which provided those voltages starting from the +12 V out of the PSU, but I didn't find that board in my iMac.

Is the DC-DC board integrated in the logic board?

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