LG XB12 Service Manual page 16

No 5.0 V
YES
Is the Vcc
(5.6V) supplied to
IC951 pin 1?
YES
Is the IC951
pin4 'H'?
YES
Check or Replace the
IC951.
No 3.3V
YES
Is the Vcc
(4.2V)supplied to
IC952 pin 1?
YES
Is the IC952
pin4 'H'?
YES
Check or Replace the
IC952.
LGE Internal Use Only
NO
Check or Replace the
D953.
NO
Check the CD CTL "H"
signal from µ-com.
NO
Check or Replace the
D955.
NO
Check the P CTL "H"
signal from µ-com.
No 9V
YES
Is the Vcc
(10.5V) supplied to
IC953 pin 1?
YES
Is the IC953
pin4 'H'?
YES
Check or Replace the
IC953.
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Copyright © 2007 LG Electronics. Inc. All right reserved.
NO
Check or Replace the
D952.
NO
Check the P CTL "H"
signal from µ-com.
Only for training and service purposes