Norton and Thevenin equivalents disagreement?

[lillybeans]

When I solve for Isc through a and b using Norton and Thevenin equivalents between c and d I get different results. Why is that?

Norton =0.5mA
Thevenin =2mA

 

[gneill]

In the third diagram, the source you've labelled as Vx is not the same as V_CD. It's V_CD which is the reference voltage for the controlled voltage source.

 

[lillybeans]

In the third diagram, the source you've labelled as Vx is not the same as V_CD. It's V_CD which is the reference voltage for the controlled voltage source.

Thank you so much! So that's where I went wrong...