Blu ARIA II, Service Manual

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Test process for Key can
’t work
NO
NO
YES
NO
Key can’t work
All key can’t
work
Single key can’t
work
Some of key can’t work
(e.g: 1/2/3, regular problem)
Upgrade software
to check if can
solve this problem
Visual check if any corrosion or short
circuit, and use multimeter to check
if any short circuit for single key
Clean the place
which is corrosion
or short circuit
Re-solder or
change CPU
U101 MT6260
Clean it
Use multimeter to check if
the voltage is 0.7V or not