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5. Trouble shooting
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
START
Check VBAT
check GPIO
signal(SUB_KEY_BL
,TP2) Voltage of
Q100 > 0.7v
Check BATTERY
Replace TR(Q100)
Yes
No
No
Check All of LEDs solder
Yes
KEY_LED is operating
check GPIO
signal(QWERTY_KE
Y_BL,TP1) Voltage
of VA301 < 1.0v
Resolder or
Replace VA301 or U1
02
N
o