I think I broke my OSSC?

[Chris Platts]

Hi!

I was working on an old 1970s ‘TV Game’ thing, trying to get composite-out from it.

I had it connected to my OSSC via my Koryuu.  Seemed to work for an instant, then died.

From then on, I couldn’t get the Koryuu’s test pattern to appear on AV2 on my OSSC.

I thought I’d broken the Koryuu, but I still see its test pattern (albeit in mono) if I connect the G line from it directly to a TV’s composite input.

So it seems I’ve fried the AV2 input on my OSSC.

RGB SCART on AV1 and the VGA port still seem fine.  Any tips on where I should poke on the board to figure out what I need to fix, or anyone done something similar and managed to fix it?  Any advice welcome!

Cheers!

• This topic was modified 2 years, 8 months ago by Chris Platts.
• This topic was modified 2 years, 8 months ago by Chris Platts.

[marqs]

It’s quite unusual that AV1 works but AV2 doesn’t since both go thru THS7353 video amp/mux. That chip even has somewhat good ESD protection and I haven’t heard many cases of it getting damaged. Anyway, I’d study the signal path from Y to the chip and check all solder joints and parts are fine. If that is the case, then replacing THS7353 should fix the issue.

[Author]

Posts