Power Amp Part Check - LG FA162 Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE OF AUDIO PART

5. POWER AMP PART CHECK

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