Is the symptom improved by replacing the FL board?
Yes
Yes
Does the potential of CN100 28pin (Key 0) change to
around 4.3V when Power button is pressed?
No
Check the FL-MAIN flexible cable
Yes
Replace the Main board
Inactive Power button on main set
Key 1 line is broken. Replace the FL board.
No
Flowchart No.1
FL Section
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