If the battery and charger check out as ok
then the issue is within the drone, look
inside the battery bay and if you can see a
damaged Deans T connector then that is
probably the issue.
If looking inside the battery bay you see
nothing untoward then you may wish to
open the chassis of the quad for further
inspection.
Another possibility is the red and/or black
power wires are not soldered correctly
onto the main board, or at the back of
the T plug, check this for faults too.
If everything is ok it should look as
pictured here.
If none of these are the issue then the
quad is more than likely dead and will
need a new main flight board. Major
surgery involved.
