LG W4-4 - Audio Output

2-57
ELECTRICAL TROUBLESHOOTING GUIDE
6. NO AUDIO OUTPUT
No AUDIO output
IC602
3.3 V OK?
Check IC601 pin2 supply 3.8 VA and pin1.
YES
YES
YES
YES
NO
X650
24.576 MHz OK?
IC700, IC701, IC702
36 V, 12 V OK?
IC602 pin19, 20, 21, 22, 23
I2C data OK?
CN600
pin11, 20, 21, 22, 24
OK?
Replace X650.
Check SMPS 36 V and IC600 12 V.
Check IC100
and IC401 pin120, 121, 122, 123, 126, 127.
Check IC100.
Replace IC700, IC701, IC702.
YES
YES
NO
NO
NO
NO