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47SL90QD-SA (CHASSIS:LJ91L) - LG TV Service Manual (repair manual). Page 66

Read LG 47SL90QD-SA (CHASSIS:LJ91L) Service Manual online

14. USB Trouble Shooting
Check Bluetooth Module
Y
Check P705
N
Y
Y
Check Cable between Bluetooth 
and Main Board
Replace Jack
Y
Maybe BCM3556(IC100)
has problems. Replace It.
N
Replace Bluetooth
N
Replace cable
Check Signal
R3022, R3023
N
Replace one of 
R3022, R3023
& Recheck
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