LG KM710 Service Manual page 97

4. Trouble Shooting
z MAIN KEY Backlight LED Trouble
Is the Voltage level VBAT
YES
LED_CA1~3,SLED_CA1~2
(Slide key) Working?
YES
Check the LCD display
Trouble shooting
YES
LCD_BL_ENM &
LCD_BL_ENS of
U102(Main) is
YES
Backlight will work
LGE Internal Use Only
START
3.35 ~4.2?
Are all LEDs
Working?
properly
NO
Charge Battery
Check the soldering of
NO
U700 not working
NO
Go to LCD Display
Trouble shooting
NO
Check the condition
If problem, Replace U102(Main)
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Only for training and service purposes