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26LU50FD-AC (CHASSIS:LB91A) - LG TV Service Manual (repair manual). Page 53

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