Acer B277 - Signal Cables and Timing

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5.2 key debug flow:
5.3 Panel debug flow:
Key Debug
Replace
keyboard
Check U12 works
END
N
Y
Key works?
Disconnect LVDS cable
Replace panel
Check set is ok?
Check U12 works
N
Y
Check LCM power
(R82) 5V ok?
Check Q1 pin2 is 5V?
N
N
Y
Check Q2 pin2
is high?(＞2.4V)
LCM power Debug
Y
N
Y
Replace Q1
END