LG MICRO Hi-Fi SYSTEM - Page 21

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