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
QM2 / WPM2341 can changed
(12
～
0V or 5V~0)
I
I
s there output signal
from U6
N
Y
Y
N
CN5 or CN6 is ill-connected
(is there voltage for panel)
or QM2 is damaged
Check if the circuit of QM1 is normal?
Change the LCD panel
or the cable to panel
U6 is illness
Check if the I/O of
U6 is damaged
QM1 is damaged
N
Y
第 38 页，共 45 页
