LG FA163 - Page 47

3-32
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Only for training and service purposes
LGE Internal Use Only
NO
Check or Replace
the D943
YES
YES
YES
NO 3.5V
Is the Vcc(4.2V)
supplied to IC955
pin 1?
NO
Check the CD CTL “H”
signal from µ-com
Is the IC955 pin4
‘H’?
Check or Replace
the IC955
NO
Check or Replace
the D970
YES
YES
YES
NO - 12 V
Is the Voltage 0f
C932 -13V
NO
Check the CD CTL “H”
signal from µ-com
Is the IC155 pin2
12V?
Check or Replace
the Q942
NO
Check or Replace
the D959
YES
YES
YES
NO 5.0 V
Is the Vcc(5.6V)
supplied to IC957
pin 1?
NO
Check the CD CTL “H”
signal from µ-com
Is the IC957 pin4
‘H’?
Check or Replace
the IC957
NO
Check or Replace
the D940
YES
YES
YES
NO 12V
Is the Vcc(13.5V)
supplied to IC947
pin 1?
NO
Check the CD CTL “H”
signal from µ-com
Is the IC947 pin4
‘H’?
Check or Replace
the IC947
NO
Replace the ZD950
YES
YES
NO VF+
Is the ZD950
Normal?
Replace the R993
or Q950, Q943
jomi