MOD GUIDE - Universal RGB-to-YPbPr/Component Circuit & Mod [8/24/2014]

[Keith Courage]

Well poopy crappy poop. Looks like I am one type of resister short. Gonna have to wait a few more days to get them in the mail now.

[turbokon]

My HDTV also accepts RGB via VGA. I will do both YPrPb and RGB mods and do a comparisons.

[turbokon]

I couldn't wait for the 22uf tantalum caps to come in so I built the circuit using 22uf polarize caps instead. I get flickers between light and dark and sometime TV screen goes blank. I don't know if its due to the polarize caps or something else. Still looks better than s-video.

[NightWolve]

I couldn't wait for the 22uf tantalum caps to come in so I built the circuit using 22uf polarize caps instead. I get flickers between light and dark and sometime TV screen goes blank. I don't know if its due to the polarize caps or something else. Still looks better than s-video.

Hm, I see a green decoding issue there, I guess related to this flicker you say you're getting. I'd guess that would be mostly a problem with the Luma signal. The + side of the caps should be facing towards the +5V source after the 500 Ohm resistor I should think (steve??) - should've made that clearer in steve's schematic last time I updated it... Note: tantalum caps are still polarized, you'll still have to watch that. You're thinking of ceramics. Thanks for testing BTW! =)

[turbokon]

Colors looks good to me. I'm using an iPhone to record the video so that's might what you're seeing regarding the green. I will play around with the polarity of the caps to see if it helps any.

[turbokon]

At first I had the two 22uf caps polarity with the plus toward the 500ohm and now I have the minus toward the 500ohm.  It flicker from too red and then too green and sometime it goes blank and sometime the picture is perfect.

[turbokon]

I found some loose connection and now the flickering is gone but more red push thru every now and then.

[turbokon]

No more flickering,  everything is constant but now it's a tad dark and a tad green.

[EvilEvoIX]

I must say the s-video from console is a force to reckon with it's the best looking built in s-video.

I would argue that the Neo Geo CD unit is amazing.  Almost justify s owning one alone.

[turbokon]

I bypass r16 and got brighter picture but color are still dark compared to composite.

Component


Composite

[Keith Courage]

turbokon, did you have to add the two 22uf caps for the jailbar fix or did it look good without them?

[turbokon]

I noticed the jail bars too especially on blue background. I added the two 22uf it only improve it slightly.

An update on my component mod, I used 500ohm for r2 and 3.8k for r4 and got brighter green and blue.

[EvilEvoIX]

Is this worth doing over a Quality S-Video job?

[turbokon]

The quality difference is quite noticeable so I say yes if you're good at this sort of thing. If not, I wouldn't bother with it, to much of a pain to build.

[turbokon]

I build another cleaner board and the red drops off after a few mins every time. It doesn't matter on how the 22uf's are polarize, it didn't help. Still waiting on my non-polarize caps.