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MX8550
START
YES
Is the UI menu moving well when
you keep moving the wheel
YES
Is the wheel moving well mechanically
YES
The wheel w ill work properly
LG Electronics Inc.
Checking Flow #1
Checking Flow #1
Check the control signal at pin
2 of Q101 of key PCB . Is it High level
?
NO
when you keep moving the wheel
Check the voltage at C 143 and
pin 3of Q101 of key PCB . Is it 2.6V when
?
sheet like white ring in the upper case
NO
?
YES
you keep moving the wheel
?
YES
2
Check the light -diffusing -
whether it is well -positioned
YES
Replace the wheel
1
NO
Replace Q 101
NO
Replace the light -
diffusing sheet
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