having an issue with a cm 1850
been through 3 boards
two boards blow fuse F5A on the board next to pins 1 and 2 on J5
these pins go to MV1 grilled evaporator defrost solenoid
the issue is the solenoid is constantly open because there is constantly voltage to the solenoid
there is also constant voltage to the heat strip on the grilled evap. cover - this is a completely different harness
the unit obviously thinks it needs to defrost
three boards
three clocks
three rom chips

what is going on?