Don't know LW3 much but have you checked the diodes in circuit with DMM. With machine off, put DMM on diode setting, black lead of DMM on the banded lead of diode, red lead on non banded lead of diode. A reading of .4 and .6 volts should be seen. When changing batteries with machine off and then starting up everything goes back to factory settings. Since you've removed whole battery pack same deal. Also make sure batteries are installed correctly and are new. Seems simple but it happens. Hope this helps.