LG RAT375 - Tuner Function Check

3-9
7. POWER AMP PART CHECK
POWER AMP PART CHECK
Refer to SMPS troubleshooting.
NO
Check
CN105 Pin2: +12 V
Pin13,15: 29 V.
YES
YES
Check IC700, IC701
Pin30,31,38,39,42,43,50,51 input voltage.
YES
Check each line resistor output voltage.
NO
Check each IC603
Pin64:+12 V input.
Check IC701, IC702
Pin28,29,36,37,43,44,52,53.
Replace the coil.
NO
Check output
line coil.
Check PWM Modulator input
IC700 Pin4,5,10,11 / IC701 Pin4, 5.
YES
YES
YES
YES
OK