Dark picture with PAL N64 S-Video cable mod

I did the PAL mod on one of these generic Chinese S-Video cables (the ones with S-Video and sound only) according to this schematic and although it worked, the picture is visibly dimmer than using an official composite cable. It is still viewable but just barely. This is on a PVM where I briefly used S-Video from a PS1 a few years ago without recalling any issue, so I don't think it's the display, and I checked the submenus for contrast and brightness as well.

This modded cable even locked up my N64 once, so I instantly thought that one of the joints must have broken, but I checked and everything is still in place. Is there any chance of certain N64 revisions needing different resistor values? I didn't check but this is a launch system so it should be the first board revision. I can also post comparison pictures vs. composite later.

Edit: fixed it now. First of all I had made the silly mistake of soldering in the 220uF capacitor the wrong way, but this didn't cause the actual issue; I didn't realize that although the order of components doesn't matter, the actual wires still have to be soldered to the pins on the multiout. Getting very sharp output from this cable now, the only minor issue is that upon looking closely faint horizontal lines are creeping upwards from time to time, could be interference from the audio maybe as the wires inside that cheap cable aren't shielded...

 

I've noticed another issue with this modded cable - I use a fan (connected to a different power strip) and whenever I switch speed on that while the N64 is running white flicker momentarily occurs on screen. I've tested this with the stock composite cable and even an unmodded S-Video cable and these don't show the same issue.

Between this and the faint creeping lines (only visible up close on dark backgrounds) I think I must have messed up the wiring somehow, even though I changed it up slightly after noticing this and still get identical results.