Step 2:
Replace the INV control
board:
Remove the white glue, demount
the screw. Then pull the INV control
board.
Flipping over the INV control board,
you can see the glue on the
connectors, remove the glue, then
dis connect all the cables.
Replace
the INV control board
with an new one, assemble the
new board back to the INV1&2
board.
