dont mean to sound rude,but you should get an approved microwave engineer to repair it,you dont have the skill and your playing with your life messing about with it
gts
December 2016
If the machine shuts down at 59 seconds then the electronic timer is probably causing it to stop at that point - it's unlikely to be anything else. The control board is the likely culprit.
Good Luck...
October 2016
I can answer this question...
sharp convection microwave oven turns off after exactly 59 seconds. how to ?