Try this. Seems to work for me, all the time when my plasma malfunctions. This resets the unit to factory settings.
'''SELF-CHECK INDICATION AND FORCED FACTORY SHIPMENT SETTING:'''
Switch on the unit.
While pressing '''[VOLUME ( - )]''' button on the main unit, press '''[MENU]''' button on the remote control for more than 3 seconds.
''''''A screen with will pop up, displaying all tested parameters and any malfunctioning parts. Exit from that screen.
'''EXIT:'''
Disconnect the AC cord from wall outlet or switch off the power with '''[POWER]''' button on the main unit.
Let me know if this helps…