I’ve finally got it working. I decided to give it a thorough clean on both sides, before I progressed any further, and while doing so noticed R636 had broken away from its solder joint. I finished the clean, resoldered the resistor and tried the voltages again. All was now clear. Tbh I don’t know if R636 was always the problem, or if I damaged it while cleaning and the cleaning itself fixed the problem. Either way I’m chalking it up as a fix!
Thanks again to all who gave advice and tried to help. No doubt I’ll be back soon!
Thanks again to all who gave advice and tried to help. No doubt I’ll be back soon!