Key Back Light - Samsung SGH-Z540 Service Manual

Flow Chart of Troubleshooting

7-9. Key Back Light

Key Backlight does not work
Yes
No
Is BACKLIGHT set Set BACKLIGHT on "15second ON"
"15second ON" in the Menu?
Yes
No
HDC401 pin 15
Replace KeyPCB Module
Vpin15 >= 3.3V ?
Yes
END
7-22
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