User Guide

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SGH-X100 Flow Chart of Troubleshooting
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7-14
9. Back Light (for Color Main LCD)
LCD Contrast high level
in the Menu?
Select LCD Contrast high level
END
No
Yes
Yes
Backlight does not work
U307 pin 5 > 3.35
Resolder U307
No
Yes
U307 pin 4 = "H"
Replace the PBA
No
Yes
U307 pin 1 ≒ 10V
Check U307 and L300
No
Yes
Yes
Backlight does work?
Check D600, ZD600 and resolder LCD
Module.
Or replace the LCD Module
No