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Flow Chart of Troubleshooting
9-9. Key Back Light
Main Key LED does not work
Yes
No
Check the U300 related to "VDD_KEY"
HDC500 pin7 is "High"?
Yes
No
C300 = 3.3V ?
Resolder or Change U300
Yes
No
Change the keyPBA
Is KeyPBA working ?
Yes
END
9-19
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