LG KG225 Service Manual page 67

4. TROUBLE SHOOTING
CIRCUIT
VBAT
KEY_BACKLIGHT
Checking Flow
KEY BACKLIGHT
Q300
R359 12K
IMX9T110
START
Is the level at R359
High?
YES
Are all LEDs
Working?
YES
Backlight will work properly.
- 68 -
VBAT
NO
Check U101
NO
Check the soldering
each R and LED
NO
Replace or resoldering
component