Yes, I could end up doing that after one more go, as I like fixing things but an understanding of how something works is needed to diagnose and pinpoint what's gone wrong with something, and you are effectively locked out from so much with modern PCB's by dint of scale, and, if you read the manufacturers fault finding steps which almost instantly fall to the replacement of whole items then the reality of "one trip manufacturing techniques" and the haunting phrase "mean time before failure" starts to spring to mind.