Power Amp Part Check - LG CJ65 Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

6. POWER AMP PART CHECK

POWER AMP PART CHECK
Check
CN102 Pin13, 14: +12 VA
Pin5, 6, 7 : 36 V.
Check IC701, IC702
Pin29, 30, 31, 36, 37, 38 input voltage.
Check IC701, IC702
Pin2: +12 V input.
Check PWM Modulator input
IC701 Pin14, 15 / IC702 Pin5, 6. 14, 15.
Check IC701, IC702
Pin27, 28, 32, 35, 39, 40.
Check output line coil.
OK
YES
YES
YES
YES
YES
YES
YES
NO
Refer to SMPS troubleshooting.
NO
Check each line resistor output voltage.
NO
3-23
Replace the coil.