No Video on Lisa 2/5

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From: James Denton <busterswt_at_email.domain.hidden>
Date: Mon, 12 Feb 2018 20:34:36 -0800 (PST)

I recently picked up a Lisa 2/5 with known memory issues that I managed to resolve relatively quickly with known-working cards. When I power up the machine, I hear the beeps that indicate all tests passed and it's waiting for a boot disk, but there's no video at all on the screen. I moved the entire card cage to my other chassis and confirmed working video output there. While I do see some slight mirroring on the left side of the screen, and the picture seems a little narrower, I believe it may be due to the 3A ROMs installed on this board.

Where is a good place to begin troubleshooting the lack of video output on this Lisa? Should I simply look to recap/rebuild the analog board or is there something that can be looked at before taking that on?

Thanks in advance,
James

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Received on 2018-02-12 23:42:50