Your LCS module may indeed be "zapped." And your Powermaster might be defective too. IMO you should be able to program a Powermaster to start NEAR zero volts. But the Z4000 never started at zero volts. As soon as you crack those handles, the voltage jumps right to the 5-6 volt range, just like an old ZW.
Honestly all of these electronic devices are so failure prone, in a club environment you almost need two of everything. Hot swap, troubleshoot, take the good one out of reserve, jack up the dues and buy another to keep on the shelf in case of emergency!
