3.3 Fail to display
The screen dose not shines or shows white:
First, use DC power supply to start-up, check the board whether power on normal, ensure
main board can power on normal
Second, check LCD module, change a new module, check whether can display normal,
Third, check L1850, D1850, U1850 solder ok or not
Fourth, use oscilloscope to test LCD_BACKLIGHT_EN, check it whether high, if not, check
U200 solder ok or not, re-hot U200 or check a new one.
No display
Is
the
LCM
well?
Change LCM
U1850
reverse
or
L1850,
D1850 NC or
not
Change
U1850
Add L1850 or D1850
Change or
re-solder
U200
Change
U200
OK
N
Y
N
Y
N
Y
Y
