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47SL90QD-AA (CHASSIS:LB91L) - LG TV Service Manual (repair manual). Page 53

Read LG 47SL90QD-AA (CHASSIS:LB91L) Service Manual online

Making 
Revision
2009. 2 . 1
13/25
LCD TV
Symptom
All Source no Audio Problem
Check The Speaker
Replace Speaker
Revision 
Check Speaker Cable
YES
NO
Replace Speaker Cable
NO
YES
Replace MAIN B’D IC807
NO
YES
MAIN B’D
L824 = 1.8V
YES
MAIN B’D
Check R701, R702, R705
Signal
YES
Replace MAIN B’D IC100
NO
Check P700 Cable
NO
MAIN B’D
L705 Pin #1
L704 Pin #2
PWM Signal ?
YES
Replace MAIN B’D IC701
NO
Replace MAIN B’D IC 701
YES
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