Jesse69
New member
I just won an ebay auction for a Defender ROM, MAIN CPU, and Interface board for $51. Good deal as the RED ROM board and Interface boards worked. But at first startup the RED Rom board gave a RAM & ROM Error Message, but after 10 On / Off startups that started good I guessed it was a good ROM Board. Now, the only bad board is the MAIN CPU Video board - it's totally dead! Upon startup the Defender gives sound but there is absolutely NO Video screen! No message / Nothing!
I'd say Defender should be among the most well documented boards to fix. Williams really wrote comprehensive Diagnostic and Troubleshooting manuals + Theory for Defender. So I gotta look things up and now put my $290 ebay Logic Analyzer to work! If this Defender board is too much for me I'll send it to Yellowdog to fix...
Anyone here ever fixed a totally dead Defender Board? A thing like a totally fried RAM chip can make the board seem dead... I wonder if I should replace all the RAM as a start...
How many member here have fixed Defender and Stargate Boards? So far I fixed 2 Stargate Boards but they didn't have major problems... just a chip or RAM replacement and then they were good...
Also got a 2nd Defender board to check... gotta do a Lithium Battery Mod to it first!
I'd say Defender should be among the most well documented boards to fix. Williams really wrote comprehensive Diagnostic and Troubleshooting manuals + Theory for Defender. So I gotta look things up and now put my $290 ebay Logic Analyzer to work! If this Defender board is too much for me I'll send it to Yellowdog to fix...
Anyone here ever fixed a totally dead Defender Board? A thing like a totally fried RAM chip can make the board seem dead... I wonder if I should replace all the RAM as a start...
How many member here have fixed Defender and Stargate Boards? So far I fixed 2 Stargate Boards but they didn't have major problems... just a chip or RAM replacement and then they were good...
Also got a 2nd Defender board to check... gotta do a Lithium Battery Mod to it first!

(sorry, I amused myself).