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Macintosh Plus Analog Board Repair

N3rd

Member
Joined
Jun 21, 2020
Messages
34
Location
France
Hi everyone,
I am currently trying to revive a Macintosh Plus. When I power it on, the display is dark and there is no startup song.
I have checked the resistance accross CR5. I mesure 16.6 ohms. It seems to indicate a defective flyback. However, even after swapped the flyback with one that I know being working, I still have the same mesure.
Do you have any clues or advices to help me ?
Many thanks for your help.
 
The Q2 transistor (BU406) was indeed defective. After replaced it, I now have a startup song but still no display. CR1 (GI854) is also defective.
 
The analog board is back to life. I now have to deal with some logic board issues but it is another story.
 
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