I have a wine fridge that is no longer working and i am trying to fix the problem which i believe is probably a triac or transistor but not sure how to measure them to find the faulty one. I have removed the board and used my multumeter to check for resistance across the pins but not sure what i should be getting. There is also a voltage regulator i blew while trying to taking some live readings. It has CW7805H IGTB1F J7500 written on it. I know i need to r eplace this but there is still a problem elsewhere.