LG C3380 Service Manual page 84

Circuit Diagram
VBAT
R362
KEY_BACKLIGHT
Checking Flow
Backlight will work properly.
KEY BACKLIGHT
Q301
12K
IMX9T110
START
NO
Is the level at R362
High?
YES
NO
Are all LEDs
Working?
YES
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4. TROUBLE SHOOTING
VBAT
Check U101
Check the soldering
each R and LED
NO
Replace or re-solder
component