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Odyssey 2: Black picture (but has audio)

odyssey 2 black video no video

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#1 Jron OFFLINE  

Jron

    Space Invader

  • 14 posts
  • Location:Syracuse, NY

Posted Tue Nov 6, 2018 9:20 AM

Greetings!

 

I just acquired my first Odyssey 2 console this weekend while at the Retro Game Con in Syracuse.  Unfortunately, my adventures with KC Munchkin are on hold while I figure out a video issue.

 

When turned on the picture is black with or without a cartridge in it.  I can hear the audio from the game when I press a number key so I know code is being executed and that the CPU is probably fine.

 

I've reset both CPU and AV chips in their sockets a few times. I also re-flowed the socket pins.  I also added a composite amp to remove the RF modulator from equation.  I get audio through it but the video is still black through composite.  The TV does see a composite video signal.

 

Next I want to re-flow some more pins, check some continuity, signals (AV and Color chips), and maybe replace the electrolytic caps (the seem ok though).

 

Before I do that I wanted to tap the knowledge base here.  Does anyone have any recommendations on how I should go about debugging/fixing this?  I do have an oscilloscope available.

 

Composite amp schematics:

http://solarfox.tril...wh_o2avc_p2.php

 

Odyssey 2 schematics I'm using:

https://console5.com/wiki/Odyssey2

 

I found this thread, but it was a dead-end:

http://atariage.com/...icture-problem/







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