SE video signal from motherboard to CRT

#1 Sat, 13 Apr 2013 - 20:31

I'm curious. I've been looking at the SE's motherboard and I see connectors for the SCSI drive, floppy drives, the speaker, and the power connector... but I don't see how video gets off the motherboard to the CRT. Does this happen through one of the wires of the power connector? If so, does anyone have a pin out schematic for that connector?

#2 Sat, 13 Apr 2013 - 22:58

Someone will have a better explanation than I, but video comes from the analog board, which looking from the back is the board on the right hand side.

#3 Sun, 14 Apr 2013 - 01:39

See the schematic in the compact mac repair guide. It's all there.

#4 Sun, 14 Apr 2013 - 15:49

Does this happen through one of the wires of the power connector?

Exactly - that wiring harness is for both power to the logic board, and video from the logic board to the analog board.

#5 Tue, 23 Apr 2013 - 00:53

It's the same arrangement as all of the compact Macs used, at least up until the SE/30 which is the newest one I've poked around in. With the early machines up to the Plus, the power supply and monitor were both integrated into the same PCB.