Cameras not working on XO-1s

[Christoph Derndorfer]

James, Gary, Wad,

thanks a lot for all your input and the information.

We now checked all the XOs which showed these camera problems and all the
connections seem to have been fine. So I assume that what we're seeing is
really the cable failure which Wad mentioned. Unfortunately my Internet
connection here at the library is so sporadic right now that I can't
download the PDF attached to #10148 but I'll try it again later today. Not
sure whether I have the time to still add tape to all the camera modules
tomorrow but I'll see what I can do.

Cheers,
Christoph



On Thu, Jan 31, 2013 at 3:39 AM, John Watlington <wad at laptop.org> wrote:

>
> On Jan 30, 2013, at 3:02 PM, Christoph Derndorfer wrote:
>
> > Hi again,
> >
> > another issue we encountered during today's workshop session was that on
> 3~4 XO-1s the camera didn't work (all machines are running 12.1.0 with the
> associated firmware).
> >
> > The effect in Record is always the same: a grey still image. However
> when running the hardware self-test 2 of the machines passed the test even
> though the camera output on the display was total noise. With the other
> machine or two the self-test failed.
> >
> > Since I've never seen issues with the camera before I was wondering
> whether there was anything we could try beyond verifying that the camera
> connector is in place (as described at
> http://wiki.laptop.org/go/XO_Troubleshooting_AV#Errors_communicating_with_the_camera
> )?
> >
> > Thanks,
> > Christoph
>
> Oh, dear.   You might have run into a failure of the camera flat cable.
> We changed the mainframe
> in 2010 (IIRC) to fix this, and there is a simple preventative measure to
> prevent it from happening
> on older machines (adding two pieces of cellulose tape to the right place
> on the motherboard.)
> Details and the fix are at http://dev.laptop.org/ticket/10148
>
> As someone already pointed out, please try replacing the camera assembly
> --- it is the quick
> way to see if this is the camera or the motherboard.
>
> Regards,
> wad
>
>
>
>
>
> > --
> > Christoph Derndorfer
> >
> > volunteer, OLPC (Austria) [www.olpc.at]
> > editor, OLPC News [www.olpcnews.com]
> > contributor, TechnikBasteln [www.technikbasteln.net]
> >
> > e-mail: christoph at derndorfer.eu
> >
> > _______________________________________________
> > Devel mailing list
> > Devel at lists.laptop.org
> > http://lists.laptop.org/listinfo/devel
>
>


-- 
Christoph Derndorfer

volunteer, OLPC (Austria) [www.olpc.at]
editor, OLPC News [www.olpcnews.com]
contributor, TechnikBasteln [www.technikbasteln.net]

e-mail: christoph at derndorfer.eu
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