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Test process for Key can't work
Single key can't
work
Clean it
Clean the place
which is corrosion
or short circuit
Customer Service
Key can't work
All key can't
work
Upgrade software
to check if can
solve this problem
Visual check if any corrosion or short
YES
circuit, and use multimeter to check
if any short circuit for single key
Re-solder or
change CPU
U101 MT6250
Some of key can't work
(e.g: 1/2/3, regular problem)
Use multimeter to check if
the voltage is 0.7V or not
NO
NO
27
Service Manual
NO
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