3c841793   
   From: cnoyes72@cox.net   
      
   marmotking wrote:   
   > On Apr 7, 6:39 pm, marmotking  wrote:   
   >> Major bummer this evening...I came home tonight excited to do some   
   >> work on a Model 4 software project only to find the video of my   
   >> working Model 4 dead.  What happens is the whole screen is being   
   >> displayed on a single horizontal line in the middle of the CRT.  Now   
   >> this is probably some sort of sync issue, but I'm curious to know if   
   >> it's most likely an issue with the CRT driver board or an issue with   
   >> the video signal generation on the motherboard.  I haven't tried to   
   >> diagnose it yet, so I'm wondering if there's advise on the most likely   
   >> place to start looking...   
   >   
   >   
   > Oh, fantastic.  I get it all taken apart, the schematics out, the   
   > scope setup and now it decides it wants to work again?  Lovely.  Well,   
   > I'm sure something's still broken, I'm just going to have to wait for   
   > it to break completely.  I wiggled all the wires, but it's not a loose   
   > connection, apparently...   
      
   Hello,   
      
       Next time it happens, try booting into model 3 mode (reset+break)   
   and see if the video does the same thing or if the screen comes up in   
   model 3 basic.  Some model 4 boards have an adj. for video in mod4 mode   
   (an adjustable pot).  Here is a link that may help if this is the issue:   
     http://www.tim-mann.org/trs80faq.html#[18]   
      
   -CN   
      
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