LG KG290 - Page 86

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Only for training and service purposes
4. TROUBLE SHOOTING
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KEY BACKLIGHT
VBAT
47
R348
R344
47
EVL5M02200
VA311
LD303
EVL5M02200
VA312
VA310
NA
LD305LD302
R345
47
R347
47
R346
47
LD300 LD304
R349
47
LD301
LED_KEY
START
Is the level at LED_KEY
Signal High?
NO
Check LED_KEY signal
YES
Are all LEDs
Working?
NO
YES
Check the soldering
each R and LED
Backlight will work properly.
NO
Replace or resoldering
component
CIRCUIT
CHECKING FLOW