the thermal cut out will kill all the power in the machine. so thats not it. do you have a OHM meter? if so check the resistance of the transistor. I assume you replaced the transistor. are you certain you put it in the right way and didnt get the transistor too hot when you soldered it in?
its possibly a main board failure but thyey are fortunately very rare
bob haller service and sales pittsburgh pa 412 366 4906, March 2012