Only For Training And Service Purposes - LG MG295 Service Manual

4. TROUBLE SHOOTING
CIRCUIT
KEY BACKLIGHT
Checking Flow
LGE Internal Use Only
KEY_BACKLIGHT3
START
Is the level Period at VA308
High Duty(30%)?
YES
Is the level Period at VA308
Low Duty(70%)?
YES
Are all LEDs
Working?
YES
Backlight will work properly.
- 70 -
VBAT VBAT
NO
Check U103
NO
Check U103
NO
Check the soldering
each R and LED
NO
Replace or resolder
component
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Only for training and service purposes