Commodore 1084S-D1 (NTSC) - Convergence Issue?

[casm]

Having a bit of a problem getting a Commodore 1084S-D1 (NTSC) to display a picture correctly, and it looks as though it's probably a convergence issue.  That said, I'm not sure where to go with troubleshooting at this point; it also came to me for free in non-working condition, so I have no clue as to its history.  Here's what the picture looks like:



Note that the picture isn't really as blue as it appears in the photo - the RGB lines are distinct, but the background is actually a fairly bright shade of white.

Due to a couple of visibly-bad caps on the mainboard, I decided to go ahead and replace all of them in one fell swoop.  This was done using Console5's 1084S-D1 cap kit, which was installed without issue.  The work was also double-checked and checked again once this issue was evident; to the best of my knowledge, the caps and their placement and solder joins are good.  Same goes for other components on the mainboard (and neckboard, for that matter).

Adjusting the pincushion pot on the mainboard does not bring the picture back into line.  The convergence rings seem to be unable to get the RGB lines to, well, converge - they get close, but never overlap completely. The yoke is held in place by the usual wedges, which are glued to both the outside of the CRT and the coil.  There is absolutely zero movement possible in the yoke with its band clamp loosened.

The signal being fed to it is from a known-good Dreamcast over composite, and other monitors have no problems displaying it.  The composite switches are set correctly, and other inputs produce the same result.

It wasn't displaying a picture before replacing the caps, so this is at least a step in the right direction.  However, monitors aren't exactly my forté - I've done tube swaps, component repair, etc. but my experience with convergence is pretty minimal so am not sure if I'm overlooking something basic.  Any help would be appreciated!

[princess prin prin]

Bad horizontal coil in the deflection yoke. It's two coils in parallel and one went open. Typically caused by corrosion. If the damage affects several turns it may be a real ballache to fix. In any case you need to remove the yoke as the horizontal coils are the ones underneath that you can't see if the yoke is on the tube. And if you manage to fix it you'll have to reconverge everything (yoke and rings).