Model: Elba EMO-3405
Fault: PCB Board no display.

Need help in finding fault in this Elba Microwave PCB board which I am very sure it is faulty because I tried testing with another board from another microwave and everything is working fine... can the transformer go bad? Don't even know where to start. Thank you.

 

can the transformer go bad?

Yes, but not very often and then it is more likely to be caused by a thermal fuse buried in the windings.

 

Check voltage at points A to B ,,and C to D on AC volts.

 

Check voltage at points A to B ,,and C to D on AC volts.
View attachment 224583

A B tested 14v ac
C D tested 6.97v ac
So what do I do next?

 

I would check for DC voltage on the Capacitor ive marked with a red & black dot.