Q: M0001 Macintosh 512k Screen Display Problem

I have an orignal Macintosh and it worked fine up until today. All of a sudden the screen went from full resolution to shrinking to only using the bottom half of the display to show the entire picture.

I can see everything like normal but now it only uses the bottom half of the screen instead the enitre screen...Anyone have any ideas what it could be?

Thanks for your help!

M0001 Macintosh 512k, Mac OS 8.6 or Earlier

Posted on Aug 9, 2013 11:12 AM

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Q: M0001 Macintosh 512k Screen Display Problem

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by kaz-k,Helpful

kaz-k Aug 9, 2013 10:37 PM in response to jse1988
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Aug 9, 2013 10:37 PM in response to jse1988

I think it's a analog board failure.
You need to replace R2(1.5ohm 1/4 watt) and Q2 transistor(MPS U51) of Vertical scanning circuit.
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by jse1988,

jse1988 Aug 10, 2013 7:40 AM in response to kaz-k
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Aug 10, 2013 7:40 AM in response to kaz-k

Do you by chance have any manuals or otherwise that can show me which ones to replace? Is it as easy as soldering in the new ones? How sure are you on a scale of 1 to 10?

Thanks for your reply
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by kaz-k,

kaz-k Aug 10, 2013 8:34 AM in response to jse1988
Level 5 (6,005 points)

Desktops

Aug 10, 2013 8:34 AM in response to jse1988

I read about it on Japanese book.
and Service manual.
http://tim.id.au/laptops/apple/legacy/macintosh_128k.512k.pdf
http://www.macmothership.com/maccontent/service.html
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Q: M0001 Macintosh 512k Screen Display Problem

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by kaz-k,★Helpful

by jse1988,

by kaz-k,

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by kaz-k,Helpful