Amp Module Troubleshooting - LG MDV902 Service Manual

10. AMP MODULE TROUBLESHOOTING

AMP MODULE TROUBLESHOOTING
IC501 9PIN(AMP-PWR)
HIGH CHECK
PN702 3PIN
"PROTECTION" CHECK
(HIGH --> LOW)
IC701 11PIN "AMP-ON/OFF" HIGH CHECK
IC701 12PIN "PROTECTION" LOW CHECK
IC701 3, 20 & 5, 18
EACH +65V & -65V CHECK
IC701 9, 14
IC701 10, 13 INPUT SIGNAL CHECK
IC701 6, 17 OUTPUT SIGNAL CHECK
YES
OK
YES
YES
YES
YES
YES
YES
9V CHECK
YES
YES
NO
EXPEND IC TROUBLESHOOTING CONSULT
NO
PROTECTION "HIGH" --> SMPS VOLTAGE
AND AMP ON/OFF STATE CHECK
AMP MODULE CHECK : MOS FET BOTH
ARE READ SHORT --> AMP DEAD
AMP MODULE CHANGE
NO
SMPS TROUBLESHOOTING CONSULT
NO
SMPS TROUBLESHOOTING CONSULT
3-10
YES
YES