Table of Contents
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Flow Chart of Troubleshooting
9-10. Key Back Light
key Backlight does not work
Yes
No
Is BACKLIGHT set AlwaysON
Set BACKLIGHT on Always ON
in the Menu?
Yes
Not OK
Check VDD_KEY_ON and
Resolder R403 and R421 and replace U401.
R403, R421
OK
Replace LED
Yes
END
9-19
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