Well I think this might actually be my replacement PC Engine PCB working first time, or at least one of the video channels looks plausible on an oscilloscope and I'm pretty amazed I've not had to fix anything to get to that stage
This is the PC Engine I impulse bought in Japan, which then never worked, probably first because the ribbon cable was fragile and had broken, and then because of all the damage I'd done when reworking the PCB (I hate old PCBs), despite my best efforts to check for broken traces. The next step is to move over the 69-pin rear connector, which is not a desoldering job I'm looking forward to
The PCB was ordered from JLCPCB using https://github.com/Board-Folk/PC-Engine

