UPDATE. Sussed the cause. That motor that was stiff was the cause of the pcb going wrong. ….I think!! Went to somebody elses Samsung, 8 kg model, for something unrelated ( a leak ) the next day and as pure luck would have it it had the same motor fitted, it spins by hand very freely so presume that was the cause of pcb fuse blowing up as per the one as above. Note whilst searching for the under 10 year part warrantied motor it was listed as …….obsolete. Surely that is wrong even for a ” Shamshung “?