LG KP500 - Page 91

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5. Trouble shooting
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START
PinA3 of U502 is
high?
FPCB is Crack?
Check the
U502(touch IC)
solderin
g
Check the Touch
window FPCB
connection
Yes
No
No
PinA2 of Touch driver
IC(U502) is high(2.9v)?
Yes
N
o
Check the PMIC
U300(PMB6821)
Yes
CN503 (touch connector)
Replace Touch window with
Front Case
U502 (touch driver IC)