Side Key Fail - Blu Dash 4.5 Service Manual

3.8 Side key fail

Side key no function
Is key switch soldering
OK?
Is R1775,
R1777, NC or not?
Y
R1776 and
N
Check U2
N
Re-solder or
change new
one
Y
Solder 1K resistance
Y
Re-sold or change U2