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Flow Chart of Troubleshooting
9-24
9-9. Back Light (for Color Main LCD)
Back light does not work
Yes
Set LCD Contrast on high level
Is LCD Contrast set on high
level in the Menu?
No
Yes
No
Check the U404 or replace U404
HDC700 pin 12, 14 = 3.0V?
pin 18 = 1.8V?
Yes
HDC700 pin 6, 8 = 20V?
No
Check the U607
Yes
Replace the LCD Module
Yes
END