OK...for now, Nuvi is opened. Battery is dead (0.5VDC) and unfortunately, display has partially damaged the smallest flat cable (2/4pin) as well as the appropriate flat connector on the PCB. I am not quite sure but I think that the flat cable carries some power, probably for display background light... So, my next question is:

Will Nuvi give any sound on its speaker while connecting charging cable if display and battery are disconnected? (I wil try to fix display during weekend)?