Re: No Video on Lisa 2/5

I'd start with the video card (after swapping the power supplies around). If you look at the schematic you'll see the width adjustment pot at the top of the board has the 28v output from the regulator on it. Begin there... no B+, no picture.

http://www.freeinfosociety.com/electronics/schemview.php?id=1424

-J

On Mon, Feb 12, 2018 at 11:34 PM, James Denton <busterswt_at_email.domain.hidden> wrote:

> Hello all,
>
> 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
>
> --
> --
> -----
> You received this message because you are a member of the LisaList group.
> The group FAQ is at http://lowendmac.com/lists/lisa.html
> To post to this group, send email to lisalist_at_email.domain.hidden
> To leave this group, send email to lisalist+unsubscribe_at_email.domain.hidden
> For more options, visit this group at http://groups.google.com/
> group/lisalist
> ---
> You received this message because you are subscribed to the Google Groups
> "LisaList" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to lisalist+unsubscribe_at_googlegroups.com.
> For more options, visit https://groups.google.com/d/optout.
>

-- 
Jason Perkins
313 355 0085

-- 
-- 
-----
You received this message because you are a member of the LisaList group.
The group FAQ is at http://lowendmac.com/lists/lisa.html
To post to this group, send email to lisalist_at_email.domain.hidden
To leave this group, send email to lisalist+unsubscribe_at_email.domain.hidden
For more options, visit this group at http://groups.google.com/group/lisalist
--- 
You received this message because you are subscribed to the Google Groups "LisaList" group.
To unsubscribe from this group and stop receiving emails from it, send an email to lisalist+unsubscribe_at_googlegroups.com.
For more options, visit https://groups.google.com/d/optout.



text/html attachment: alternate version of message