I have a Mac Plus that I bought new that I am trying to get
operational again.  When it finally became unusable, the screen would
go to a thin vertical line and sometimes it would work again if I
tapped the case.  This issue would happen right away upon turning the
Plus on.  I resoldered some of the joints (L2, C1, J1) on the analog
board and it seems to be better, but there is no start-up bong when I
turn on the machine.  The screen appears normal with the flashing
floppy icon.  I haven't been able to do enough testing yet to see if
the resoldering has fixed the issue after it has been warmed up for a
while.  What is the cause of no start-up bong?

I also have a spare logic board that operates weird.  At start-up, the
screen is the size of a postage stamp, tightly surrounding a frozen
floppy icon.  The rest of the screen is dark.  I haven't checked to
see if it can boot, but I figure this is a significant failure.  I
have tested this logic board with a known good analog board and the
board that I described above.  Can this logic board be repaired?


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