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47SL80YD-DA (CHASSIS:LT91T) - LG TV Service Manual (repair manual). Page 56

Read LG 47SL80YD-DA (CHASSIS:LT91T) Service Manual online

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 
전자 - 6-2
Revision 
2009. 2 . 1
13/25
LCD TV
Symptom
All Source no Audio Problem
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