Date   : Sat, 24 Apr 2010 20:43:16 +0100
From   : jumbos.bazzar@... (Mark Haysman)
Subject: BBC B with odd screen fault

  The BBC all works, apart from the screen, which will display output from 
the BBC, but not properly (see the video from megaupload). The video was 
taken using the UHF output.
  Anyone know what causes it or how to fix it?

  http://www.megaupload.com/?d=AV3QBNO6

If it's Mode 7, and it's not doing it in any other mode, then it's either 
the LS273 @ IC15 or the SAA5050 itself. If it's in other modes too, then try 
the LS245 @ IC14. If that still doesn't cure it, then it would probably need 
a scoping.

Mark.