LG MCV903 Service Manual page 33

YES
IC603 ¡ PS9830
communication check
NO
9 PIN SOTO ¡ 33PIN SDIN
10PIN LRCK ¡ 32LRCK
11PIN MCLK ¡ 30MCLK
13PIN BCK ¡ 31BCK
YES
NO
Check the
PS9830 input
YES
OK
13. PWM MODULATION PART CHECK I
PWM MODULATION
PART CHECK I
YES
NO
Check CN701
9PIN 5V
YES
Check IC505
NO
input 5V and
output 3.3V
YES
LGE Internal Use Only
IC100 38PIN ¡
IC603 Check the REST
operation
YES
Check each communication
line resistance
YES
OK
Refer to PS9830
Troubleshooting
Refer to SMPS
Troubleshooting.
Check
NO
IC505 input power
5V
YES
NO
Check the IC603
input power.
YES
Check the
power at both terminals
of FB803
YES
OK
Check CN701
9PIN 5V
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NO
Replace the related
part
Only for training and service purposes