LG MICRO Hi-Fi SYSTEM Service Manual page 21

10. PWM AMP PART CHECK
POWER AMP PART CHECK
P7905
3pin + 13,14,15 pin 26V
Check input power IC700
41, 35, 32, 26pin
Check input power of IC700,
1, 44, 23, 22, 21pin +12V
Check PWM modulator
input 23, 26pin
Check POWER IC700 34, 29pin output
Check output line coil
OK
YES
YES
YES
YES
YES
YES
YES
NO
Refer to SMPS troubleshooting
NO
Check resistance power
IC700:R702,701,726,727,724
NO
Replace the related parts
3-8