Hardware Trouble shooting
-9-
5-3) Display Trouble (white screen)
White screen
Check if the voltage of panel power
supply is normal (depend on panel)
supply is normal (depend on panel)
Y
N
Is there voltage on grid of
Q8/3407 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
All manuals and user guides at all-guides.com
