its totally dead, tried loads of psu, cables, removing the battery and reinserting it.
Holding down keys everything.
I took the plung and bought a new battery.
Its out of the tablet the both batteries read 2.74v on a fluke dvm, inserted in the the tablet they read 0.37v.
wont charge or detect in a pc,
could be failed component, loads of smd components some are diodes etc.
could be usb socket knackered.
What I need is a schem or picture showing diodes or resistors or fuses.