Flow Chart of Troubleshooting
9-12. LCD Back Light
Backlight does not work
Yes
Is BACKLIGHT set
AlwaysON in the Menu?
Yes
C627 ≥ 3.5V
Yes
U603 Pin 10, 11, 12 ='H'?
Yes
Replace the LCD
Yes
END
No
No
No
Set BACKLIGHT on Always ON
Replace or Resolder U603
Check UCP300, U603
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