Hello Bearsomg, I have been trying the exact same mod as yours (to include a mini ITX-PC board in an iMac G3 slot-loading while keeping its PSU and CRT !) and I am now stuck exactly where you seemed to be stuck on Sept.2012 ! I have made a VGA cable to connect the HE20 connector to the VGA output of the PC board but it looks like I am still missing some pins.
Even when shorting +5V-trickle (T5V) to PFW, I cannot hear the "PONK" sound of the CRT charging up .... Have you made yours working right finally ? Could you finally find if pins 4, 5, 7, 8, 12, 19 and 20 have to be connected and where to ? Thanks for any help you can share here or by PM. ym58
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