LG LRM-519, Service Manual

Page: 23 / 192

3-9
7. AUDIO TROUBLESHOOTING
Audio output
problem
IC104 Soldering
Check IC500 (11-pin)
High = “1” OK
NO
YES
YES
System part check
IC500 (5, 6, 10-pin) Clock
/ Data / Sync Input Check
NO
YES
YES
IC500 (1, 9-pin)
+3.3V out OK IC500 (2, 3-pin) 24.576MHz
clock In/Out OK
NO
YES
IC500 (25, 38-pin)
+5.0V out Check
IC500 soldering
Check
IC502 (8-pin) +8.0V
input OK
R528, R529 C554,
C555 Soldering OK
F509, F511, F517,
F518 Soldering OK
Audio Output OK
IC502 (1, 7-pin)
Audio out OK
NO
B504 soldering OK
Re-soldering
NO
J900 Connector
Power Cable Check
NO
B506 Soldering
Check
NO
NO
Re-soldering
NO
YES
YES
J900 Connector
Power Cable Check
YES
YES
YES
YES
Re-soldering
NO