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

[NightWolve]

Where you soldered the negative end of those 2 jailbar fix capacitors is the closest other ground point. Be interesting to see if that would make a difference.

[turbokon]

I just installed the component board in another turbo duo and can confirm the jail bar is eliminated with the jail fix. So the jail bars fix definitely works on the turbo duo but doesn't work so well on the turbografx systems.

[Keith Courage]

Meh, that's a bummer. I'll only suggest this for people with DUOs at the moment then. At least it works well with those. Personally the with the jail bars being put out by the Tg16 I modded I'd rather just use composite just so the jail bars don't exist.

[turbokon]

I change the placement of the component mod board, jump hu6260's pins 55 & 56 to the ground of the component board and jump from comp board to another ground. This is the best I've seen regarding the jail fix for the tg16. It's barely noticeable.

[turbokon]

Another thing, I see that pins 41 & 43 already have capacitors to ground on the duo so I switch to 33uf caps with the tg16. So it's safe to say with the combination of all these things drastically improved the jail bars.

[NightWolve]

Fine work, turbo! So steve's ideas are vindicated once again. I wonder why things didn't work so well in Keith's attempt, though. I guess I'll just need a disclaimer on any Image Guides: "Your Mileage May Vary, etc."

[ConHuevos]

I'm going to be installing a BA6592F coupled with a 3 video channel amp in my duo as soon as my parts arrive within the next 2 weeks, I'll post my results.

In the mean time does anyone know if you can buy the AV connector plug for a turbo duo or do I need to change it to something like a mini din so I can make a component cable for this.

[Keith Courage]

Everyone here has their preferences. din 8 jack, VGA jack, RCA jacks. all work well.

[ConHuevos]

Ah, I just want something where I don't have to rip a hole in the system.  I want it to be able to go back to stock if I ever want to change it.

[thesteve]

i just built a board up to test/inspect turbokon's board
im very happy with the performance of the board as designed
i also built it using all 22uf ceramic caps instead of the 220uf and 470uf i originally spec'd
the test was connected to the expansion port on a white PCE

as for the AV din on the duo, the 8 pin din is easy to find and would work for the mod

[turbokon]

Yeah, I just got some din 8's in and will use this on the next duo I'll mod.

[turbokon]

Thesteve, it's about time you caught up with me:)

[Duo_R]

I assume the jail at fix with 22uf caps works on the Duo-R?

[thesteve]

yes i did it on a duo-r

[turbokon]

I just installed the component board in a turbo express. I can't get rid of the jail bars. I tried grounding the two caps to hu6260, shield and component board but got the same results each time.