Well, it could not that bad. The H and V syncs need to be combined to a composite sync, hopefully this is handled downstream the custom 080SN.
First, I would measure frequency at the pins that SamWhiskey mentioned, a good multimeter should have a frequency meter and although this may not be the most appropriate tool to use, you may get a feel is the signal is there and if it is stable. Horizontal should be around 15.7 kHz, vertical at 60Hz.
If the signals are good and steady, follow the path from those pins to the IC that is next and check the functionality. If you can't check functionality but have a known good replacement, you may be able to piggyback it with that. See what happens...
Good luck!
paris