Thanks for your help, everyone. My dead old 2008 iMac A1225 EMC2211 will have a new life as a simple display.
This is the pinout of the Molex 5569 plug from the genuine Apple ADP-250AFB power supply. Use of the three 12V pin to power the M.NT68676.2A board. Connect GND to GND, Use the 5.5x2.1 connector instead of 12V and GND of the CN5 plug of the M.NT68676.2A.
Connect BL_ON and P_DIM/ADJ respectively to pin 3 and 4 of the CN5.
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