Akai LEA-19V07P, Service Manual

Page: 8 / 34

White screen
3
、
Display Trouble
（
white screen
）
Check if the voltage of panel power
supply is normal(depend on panel) supply is normal(depend on panel)
N Y
Is there voltage on grid of
Q8/WPM3407 can changed
(12
～
0V or 5V~0)
Is there output signal
from U12
N Y
Y
N
CN4 is ill-connected
(is there voltage for panel)
or Q8 is damaged
Check if the circuit of Q9 normal?
Change the LCD panel
or the cable to panel
U12 is illness
Y
N
Check if the I/O of U12 is damaged
(the 132th pin) Q9 is damaged
Y
N
8