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bengi3

Macintosh Classic chime but no video

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So I am trying to liberate this Mac Classic. Analog is good (fine with another good logic), logic recapped: I got the chime but then dark screen and it reboots in a loop: chime --> dark screen --> reboot --> chime --> dark screen.

What to check then?

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Check the voltages. My guess would be bad analog board.

Different logicboards might slightly differ in voltage tolerance - this might be the reason that one board works but not the other.

 

I have yet to see a Classic that does not have bad caps on the analogboard.

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thank you, your thought confirmed my intuition. will try this logic boand on a fully recapped analog from another Mac that I liberated a couple of months ago, and let you know.

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