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4.15 Main Key Backlight LED Trouble Shooting
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Keypad backlight LED Operation scheme is shown below.
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Backlight operation
- Keypad backlight LED is controlled with MAIN_KEY_BL_EN signal
- MAIN_KEY_BL_EN signal from DBB(U102)
- The LEDs are forward biased and turned on
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Check Point
- VBAT level ( 3.35 ~4.2V)
- LEDs
- Q100(Main key)
- Main key, Main, Main FPCB connection
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Only for training and service purposes
R546
Q500
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Содержание SHINE CE110
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