Power Amp Part Check - LG MDD262 Service Manual

9. POWER AMP PART CHECK

Power AMP part check
P7905_3PIN : +12V,
PIN13, 14, 15 : 35V.
Check each IC700, 701, 702, 703
PIN21, 26, 29, 34 input voltage.
Check each
IC700, 701, 702, 703
PIN1,17, 18, 19, 36 +12V
input.
Check PWM modulator input.
Each IC PIN4, 6, 14, 16
Power IC700, 701, 702, 703
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