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Flow Chart of Troubleshooting
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9-17
9-9. Key Back Light
U301 pin6 is "High"?
Check the UCP200 related to "VDD_KEY"
END
No
Yes
Yes
Main Key LED does not work
U301 pin3 = 3.3V ?
Resolder or Change U301
No
Is KeyPBA working ?
Change the keyPBA
No
Yes
Yes