OK so I went in and soldered the J4 connections, as per trag, Brooklyn and others, and the connector from the lower board.

Then powered it up.

Initially nothing, but no flickers and weird noises when tapping either.

Then I turned the brightness dial.....

Success 8-o :b&w:





Note that the black line is the refresh of the monitor, it is clear and perfect.

The floppy icon is a flashing question mark.

Next steps:

- Find a mouse

- Find some 400k media

- Find a SCSI zip drive

Thanks everyone! The Mac Plus has a new lease of life!