I used the LM1881 to separate the sync from composite on the PS1. I also have a Genesis (wired through VGA with H+V sync) and a SNES wired the same way. None of the H+V sync systems display anything, and they all show NO SYNC. THe PS1 as stated before, works briefly.
I tried with Sync LPF as well. The NO SYNC message comes on and off.