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Level 3 Repair
8-39
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8-3-17. Key Back Light
Main Key LED does not work
Yes
No
Replace the UCP200 using a Heatgun
Check the Key LDO enable is
high.
(TP : R314 = 1.8V)
Yes
#1 : Replace the LED
(be possible that the sample has the problem)
#2 : Change PBA
Key LED does not work?
(look over the LED light)
END
Yes
No
Check the Main key voltage
is high.
(TP : L310 = 3.3V)
Yes
Replace the U315 using a Heatgun
No