White screen
Is driver-lcd voltage normal?
(decided by using screen)
N
Y
Q8/AO3401’s G-pole voltage
(3.3V
~
0Vor5V~0)
Whether U14 has signal output?
CN17 contact badly
Or Q8 damage
Check circuit of U14 pins
Or U14 I/O damage
N
Y
LCD damage
or driever-lcd wire damage
Change U14
三
三
三
三、
、
、
、
Display Trouble
Display Trouble
(
(
(
(
white screen
)
)
)
)
Y
N