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3、Display Trouble （white screen）
White screen
check if the voltage of panel power
supply is normal (depend on panel)
N
Y
Is there voltage on grid of
Check the output signal
Q24/AO3401 can changed
from U5
(3.3V~0V or 5~0V)
N
Y
Y
N
Check the circuit from
CN8 is ill-connected (is
Change the LCD panel or
U5 is damaged or power
U6/NT68F631 to Q24 or U6
there voltage for panel?)
The cable to panel
supply is abnormal
or Q24 is damaged.
is damaged
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