Pwm Modulation Part - LG MBD-D102X Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE OF AUDIO PART

5. PWM MODULATION PART

PWM modulation part
YES
Check P7905
9PIN 3.3V
YES
Check IC604 PS9829 VDD PIN
power (3,10,22,29,39,47,56,65,
72,87,94) Check X601 2PIN 3.3V
YES
Check if
X601 12.288MHz is
working.
YES
Check IC604
PS9829 86PIN
CLK input
YES
Check
output of IC100
78KOKF2
21-->PWM_CLK
22-->PWM_DATA
43-->PWM_REST
YES
Check
IC604
PS9829 DATA input
78 PIN-->DATA
79 PIN-->CLK
96 PIN-->REST
YES
Check PWM
MODULATOR
output FL:75(+)74(-)
FR:71(+)70(-)
YES
OK
NO
Refer to SMPS
Troubleshooting
NO
Check the
related part of X601
OK
NO
Check R668(470Ω)
output
OK
Check
resistance
NO
output of LINE DATA:
R623 CLK: R624
RST: R619
OK
Check
DVD ASS`Y PS9829
NO
communication condition
(DVD INTERFACE)
Check IC604
PS9829 DATA input
NO
OK
Check IC604 PS9829 part.
3-5
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
Replace the related part
Replace the related part
Replace the related part
Refer to DVD
Troubleshooting
Check resistance
output of each LINE