LG FA162 - Power Amp Part Check

3-10
ELECTRICAL TROUBLESHOOTING GUIDE OF AUDIO PART
5. POWER AMP PART CHECK
YES
YES
YES
YES
YES
YES
Power AMP part check
Refer to SMPS troubleshooting.
Check resistance power
IC700: R700, L700, L703.
Replace the related part.
Check input power
of IC700 Pin29, 30, 31, 36, 37, 38.
Check PWM modulator input
Pin5, 6, 14, 18.
Power IC700,
Pin27, 28, 32, 35, 39, 40 output.
OK
NO
NO
NO
CN103
Pin14, 15: 27 V
Check
IC700 Pin1, 2, 22 :+12V
input.
Check output line
coil (L701, L702).