LG SPD75A Service Manual

5-6
Copyright © 2020 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
ELECTRICAL TROUBLESHOOTING GUIDE
Check LED status.
Check sound status.
Check LED status.
Check SMPS board or
Module connection.
Check Module or Connection.
Yellow LED blinks irregularly.
Sound cut off irregularly.
Red LED is turned on.
LED is Red.
Turn off the equipment that
gives interference.
Turn off the equipment that
gives interference.
interference.
interference.
Remate.
Remate.
Check SMPS board.
AMP PVDD
(RCN301 pin9, 10) no output.
Check RIC308.
AMP 12 V (RIC308 pin4)
no output.
Check RIC307.
3.3 V (RIC307 pin3)
no output.
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
No Pairing
No Sound

LG SPD75A Specifications

General

Brand	LG
Model	SPD75A
Category	Speaker System
Language	English