Have him turn up the brightness to see if it's scanning the full screen.
If it's not, then the prob is still on the A/B board.
- JS
On 2/1/14 6:00 PM, Tom Frikker wrote:
Hi Charles,
It sounds to me like the component that "stretches" the video
vertically has failed, and therefore, it's just a horizontal line in
the center of the screen. Does this sound correct? I'm pretty sure
that maybe electromagnets? do the "stretching", so maybe something
that powers the vertical ones failed. Sorry for the bad terminology,
but this might be something to look into.
Tom
On Saturday, February 1, 2014 5:10:06 PM UTC-5, Notgoing Totellyou wrote:
I re-capped my buddys A/B, really all it needed was C1, pretty
typical …
I changed those caps, sent it back, didn't bother to test it
because he said it still sorta worked.
Anyways. he got it back, and now when he flips it on, hears the
bong, but on the screen all he has is a horizontal line.
I think it even boots from a disk too!
Anyways i told him to try his plus main board, just to make sure
something funny didn't happen with the A/B i re-capped for him.
and sure enough the plus main board works fine with the A/B , so
the Issue is not the A/B.
He said that when he removed the A/B originally, to send it to me,
He used an alligator jumper and connected it to the screwdriver
and the case, and not to the ground lug at the top of the screen,
said it made a pretty good pop too.
They make sure to say, on most of those apple sites. connect to
the ground to the ground lug.
So i my question is, What do you think went out on his main board?
he is probably going to send it to me to fix, I don't mind.. ill
help em out.
But just not sure where to start looking.
let me know if you have any pointers.
maybe i will get him to send you something out for helping me fix
it :)
Thanks
Charles
I am looking at the schematic here.
either i am getting older or this one just looks blurry.
http://www.digibarn.com/collections/diagrams/mac-512klogicboard/mac-logic-schematic.jpg
<http://www.digibarn.com/collections/diagrams/mac-512klogicboard/mac-logic-schematic.jpg>
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