Power Amp Part Check - LG OM7560 Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

5. POWER AMP PART CHECK

POWER AMP PART CHECK
Check CN202 pin1, 2: 12 V,
pin8, 9, 10: 48.5 V (35.5 V).
Check IC701, IC702
Pin51, 52, 42, 43, 38, 39, 30, 31 input voltage.
Check IC701, IC702
pin64: AMP_12V input.
Check PWM modulator input
IC701 pin4, 5/ IC702 pin4, 5, 10, 11.
Check IC701, IC702
pin28, 29, 36, 37, 44, 45, 52, 53.
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
3-28
Replace the coil.