LG MCV903 Service Manual page 34

YES
Check IC604
PS9830 VDD
PIN power(3,10,
22,29,39,47,56,65,
72,87,94)
YES
Check the
NO
X601 12.288MHz
operation
YES
Check the
IC604 PS9829 86
PIN(12.288MHz)
CLK input
YES
IC100
87F5NC8A
NO
79¡PWM_CLK
80¡PWM_DATA
3¡PWM_REST
Check the
output
YES
Replace the
related part
YES
OK
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
YES
Check
NO
IC505 output power
3 3V
YES
Check the power at both
terminals of FB607
YES
OK
Check
NO
the IC604 87,86
PIN power 1.6V
operation
YES
NO
Check X601
12.288MHz
YES
OK
Check the
communication
waveform of both
terminals of R670
CLK ,R671
DATA
YES
NO
REST check
YES
OK
IC505
NO
POWER CONT
HIGH
YES
Check
NO
the IC505 output
power
YES
OK
NO
Check the power of both
terminals of R667 120 Ω
Replace the
related part
PWM_CLK
PWM_DATA
REST
Check
NO
the output waveform
at both terminals of
R665
YES
OK
3-13
Check IC100
NO
Check the both terminals
83 PIN POWER
of R118 100 Ω HIGH
CONT HIGH
YES
Replace the
related
OK
Replace the
related part
Replace the
related part
LGE Internal Use Only
YES
Replace the
related