The power supply,magnetron, and door switches are all quite simple.
Easy to diagnose (imho). Hard to believe that somehwere there isn't a
schematic for the display/control board. And I find it harder to
believe that the manufacturer of the SMD transistors would take the
time to print a number on them and it not be cross referenceable. I've
found cross for the good transistors, but the bad one illudes me.
Guess it rerally is a throw away item.


A schematic exists for the control board, but it will be an internal asset
to the company that designed the board. Many thransistors in this sort of
thing are house numbered for internal identification. What is wrong woth the
unit? You should be able to test components and diagnose the board without a
schematic. It's very rare for me to have one for anything I fix.