Power Amp Part Check - LG XC102 Service Manual

9. POWER AMP PART CHECK

Power AMP part check
P7905_3PIN : +12V,
PIN13, 14, 15 : 35V.
Check IC700 PIN21, 26, 29, 34 input voltage.
Check
IC700 PIN1,17, 18, 19, 36
+12V input.
Check PWM modulator input.
Each IC PIN4, 6, 14, 16
Power IC700 PIN20, 27, 29, 34 output.
Check output line coil.
OK
YES
YES
YES
YES
YES
YES
YES
NO
Refer to SMPS troubleshooting.
NO
Check each LINE registor output voltage.
IC700 : R701, 702, 726, 727
NO
Replace the coils
3-7