[Coco] Coco3 appears to be dead: green screen with no text.

[Bob Devries]

The first thing to do is to open it up and make sure all the socketted 
chips, especially the GIME (the square PLCC chip) are secure in their 
sockets. Do this by pushing down on them gently, but firmly.

If the coco3 is a 512K one, make sure the daughter board is NOT pushed down 
too far into its socket. This can sometimes cause problems.

--
Regards, Bob Devries, Dalby, Queensland, Australia

Isaiah 50:4 The sovereign Lord has given me
the capacity to be his spokesman,
so that I know how to help the weary.

website: http://www.home.gil.com.au/~bdevasl
my blog: http://bdevries.invigorated.org/

----- Original Message ----- 
From: "Michael Furman N6IL" <n6il at ocs.net>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Friday, December 14, 2007 8:09 AM
Subject: [Coco] Coco3 appears to be dead: green screen with no text.


>I just received a coco3 that I got on Ebay.  I have connected it to a
> monitor with composite video input (not RGB) and when I turn it on I just
> see a blank green screen and am not greeted with a ROM copyright info or
> OK prompt.  I've looked at the service manual, but have not checked
> anything yet.  The fact that the screen shows up at all when power is
> applied suggests that the video stuff is okay on the surface.  My
> intuition tells me that it is a "Processing problem" (as the
> troubleshooting section 6.4 calls it), possibly due to an IC that needs to
> be reinserted in its socket.  I can't tell from the service manual or any
> pictures on the web which ICs are in sockets and which are not.  I am just
> looking for suggestions at this point.
>
> --Mikey
>
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