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Side key
1.19.3
Side key circuit：
Side key include volume key and power
Up
and
down
out side-FPC
two resistors R1006, R1007 are OK, and then determine when pressing
the upper or lower button when the upper or lower key is shorted to
ground,
if it
problem can be determined U301 chip, the chip can be changed. Power
button is on
monomer no problem, consider whether short varsities, and then consider
theU501 problem can be.
1.20
Keyboard light
Keyboard light circuit：
2013-10-18
YU220 service manualV1.0
keys to
communicate with
monomer
and welding no
means short-circuit the
the U501 communication, first
Huawei secrets, no dispersion without permission
key.
the U301,
problem,
normal, not short-circuit
rule
out FPC and welding
the
first rule
consider
the
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