Key Back Light - Samsung SGH-E740S Service Manual

Flow Chart of Troubleshooting

9-10. Key Back Light

Main Key LED does not work
Check the UCP200
related to "BACKLIGHT"
Check the U103 pin 2
Check the U103
pin 5, 8(C112, C117)
Yes
Yes
= H
= H
Yes
END
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No
Resolder or change the UCP200
No
Resolder or change the U103 on Sub PBA
No
Resolder or change the U103 on Sub PBA
9-20