Apple II REV 1 repair

[Nama <forums6000@mac.com>]

Hi,
I'm trying to bring a very early (serial # in the 12000's) rev 1 Apple
II back to life. I have been using the swap method to interchange
chips from a known working apple II+ motherboard.
At first it was completely dead, and so far I have now gotten it to
beep, power light comes on, and about 50% of the time it will access
the disk drive and look for a floppy, but no video at all!
If I insert DOS 3.3 disk on the times it is looking for a disk, It
will seem to boot, and I can then do a blind IN#6 and the drive will
boot again, so I'm assuming at least some of the time the machine is
actually functioning at a basic level, However when the drive works,
or does not work seems totally random, and is probably a separate
issue.
I think my first and biggest hurdle is to get the video working. I
have replace all the IC's in the video circuit (and many more) without
change. There is nothing on the screen at all, and It is completely
blank. I'm don't even think there is an onscreen flicker when I turn
the machine on and off.

With further inspection of the video area I noticed that someone has
done a bad repair of replacing the 2n3904 npn with a c1214(?). At this
point this seems like the likely culprit, but before I try to fix the
dodgy repair (some pad damage) I wanted to see if anyone else would
agree that this could be the suspect video part.

As usual, thanks in advance

Philip