Glad it worked
Regarding the sync problem, another thing I have noticed in my research is that the sync for the SNESjr/2 is usually taken from the 'S-RGB' chips Sync input pin, but I believe there is also a Sync output pin aswell....
Now im not positive here, but having looked at alot of ROHM datasheets I believe the BA7232 is an almost direct successor to the BA6596 'S-RGB' video chip used in the SNES2, the main difference being that the BA7232 is a SOP20 package and the BA6596 a SOP24 package, as there are four extra pins on the BA6596 which are not connected/unused and are located between the Red, Green and Blue input and output pins, if you imagine these extra unused pins on the BA7232 both chips appear almost identical from what I have seen.
So having looked at the BA7232 datasheet here:-http://www.datasheetarchive.com/pdf-datasheets/Datasheets-24/DSA-477788.pdf
find that Pin 18 on the 'S-RGB' is the Sync output pin (This isnt
definite though and I could be totally wrong, so please see disclaimer below!*) Pin 18 is opposite the Sync input pin. According to the 'measurement circuit' diagram on page 4 you should use a 2K resistor to ground on the Sync line - although im unsure if this resistor is already present on the sync input on TV/Monitors? (The 75ohm resistors to ground shown on the RGB/Video lines etc are already in your TV/Monitor)
I have never had to use C-Sync before as all Scart TV's use the Sync from Composite Video.
...This is of course all assuming that the two chips are almost the same.
Alternatively, if anyone here has an original model NTSC SNES that has an 'SNS-CPU-RGB-01' or 'SNS-CPU-1CHIP-01' motherboard revision, these also use the 'S-RGB' video chip - so you should be able to follow the traces and components used on the Sync line. I have a PAL SNES with the 'S-RGB' chip, but thats no good as the PAL SNES uses different video components, and the Sync line is not even connected/used! (Its replaced by +12V for Scart auto-switching)
I'm surprised nobody was more interested in the SNES/N64 encoder datasheets when I posted my 'findings' weeks ago!:-http://nfggames.com/forum2/index.php?topic=3525.0
P.S. I agree that it would be good to have another thread for these SNESjr/2 mods. Perhaps a mod can separate the relevent posts into a new thread? *Usual disclaimers apply - this mod is totally untested, and should you try this I take no responsibilty for any damage/explosions it may cause!<EDIT>
Just wondered if your 'ghost image' could also be caused by interference if your using a poorly shielded cable? Oh and if your original SNES is one of the last models (You mentioned its a later model with no cart lock mech) do you know if it has one of the board revisions I mentioned above? <SECOND EDIT>
Just realised theres one other thing you could try - adding 22pf (or 47pf) capacitors to ground on each of the Red, Green and Blue lines after the 75ohm resistors - this should be relatively safe to try as Nintendo always seems to use these 'capacitors to ground' on all the video lines (R, G, B, Y, C & CVBS) for all their consoles. Lawrence even used them on the old SNES2 RGB mod and said these capacitors are "...just an interference filter, and you can probably leave it out entirely." but perhaps they are more important than I had first thought
I'd probably try adding these 'capacitors to ground' first and see if they make a difference before trying the alternative Sync mod I mentioned.