Space intruder shoei

[Lurch666]

Looking at a space intruder PCB and it appears to have a factory mod but it's damaged.
There are no schematics or pinouts I can find but have wired it for power (+5V.-5V and +12V) but can't find anything that looks like a proper video output.
I'm getting clock on the Z80 but I'm guessing the mod deals with the video output. Maybe there's a composite B/W output somewhere as well?

Anyway does anyone else have this PCB? Could do with some hints on the mod.



I figured the top left pin is +5V and the missing bottom right is GND but there are other pins with solder on them connected to nothing and one of the wires are disconnected as well.
Without any more info I don't think I can go anywhere.

Can anyone out there help?

 

[Lurch666]

So with the help of this picture from @ExZX I figured the socket was actually soldered onto a nearby chip.
https://www.ukvac.com/forum/attachments/space-intruder-jpg.46140/



I replaced the white socket and soldered it back but this has made no difference as I'm still not seeing any output that looks like a video signal although I am now getting voltage on the little daughterboard that I'm assuming is video out.
Checked the CPU and roms and they seem ok and code appears to be running so tracing around the circuit since there are another two wires going to the daughterboard that look like they are providing signals from the timing circuit near the crystal but there's no signals on the wires.