SNES: Audio, but no picture

Or you could also try to recap the thing. C69 for instance looks dubious to me. Even though Snes does not seem prone to Cap issues so far, it would not hurt to try a full recap. Would at least clear a possibility. They sell full cap kits for <5$ at Console5, personally i would try that and When the caps are off, I would give the board a good clean and make a general trace inspection.

 

My Super Famicom had a couple of leaky caps, they generally don't have cap issues like the Game Gear and TurboDuo do but I think they're getting to the age where a recapping might not be a bad idea.

 

Those traces are on the underside of the mainboard aren't they? There's so much lacquer, how am I suppose to test them? :\

 

Check each point for continuity and if you find a trace that doesn't have continuity, patch it up with some wire.

 

Well, I know that much, but I can't even see the traces because they're covered with so much lacquer! How am I suppose to know which points are connected if I can't see the trace? Randomly stabbing around with the multimeter?

 

Another test I would try is check resistance between the video lines and ground. If your video is shorted to ground for some reason, well...

 

Just a random thought, what if I ran some new wiring from the video encoder chip to the video connector and see if that worked? In that case, would I be looking at the S-ENC chip? If so, what legs lead to where on the video connector?

 

For testing purposes that's a perfectly fine solution.

 

Hmmmm, does anyone have a diagram of what legs on the S-ENC chip lead to what pin on the video connector? I can only seem to find RGB-A diagrams, since I guess people don't normally mod the S-ENC

 

I guess you could even try the easy component mod while you are at it, but supposedly it does not work on some HDTV.
In any case This thread has the BA6592F datasheet:
http://www.sega-16.com/forum/showthread.php?20732-Easy-SNES-SFC-YUV-component-video!

The S-enc is apparently a rebadged BA6594AF and I think the pinouts are the same as the datasheet linked above.

I tried the easy component mod on a SNES with S-ENC and it worked pretty well. This being said I do not consider this mod mature yet, you need to amp B-Y and R-Y to get proper colors, they do not tell you that in the tutorial. And also, there is some nasty DC Offset on the S-enc outputs, I have yet to find a way to properly filter that out. I actually posted about it at the end of the thread i linked above.