Samsung GT-S5200 - SOS and Mobile Tracker

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Flow Chart of Troubleshooting
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9-19
9-9.
Key Back Light
HDC500 pin
7
is
"
High"?
Check the
U300
related to
"
VDD_KEY"
END
No
Yes
Yes
Main Key LED does not work
C300
=3.3V?
Resolder or Change
U300
No
Is KeyPBA working
?
Change the keyPBA
No
Yes
Yes