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42LH301C (CHASSIS:LD91A) - LG TV Service Manual (repair manual). Page 62

Read LG 42LH301C (CHASSIS:LD91A) 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
CHECK MAIN B’D 
JK700 or JK701
YES
Replace MAIN B’D 
JK700 or JK701
NO
_ If headphone is connected, Speaker sound doesn’
t work.
Replace MAIN B’D IC803
NO
YES
MAIN B’D
L700 = 1.8V
MAIN B’D
Check R720, R721, R722
Signal
YES
Replace MAIN B’D IC100
NO
Replace MAIN B’D IC701
NO
Making 
Revision 
2009. 2 . 1
18/34
 LCD TV
Symptom
All Source no Audio Problem
26~42LH2000
32~47LH3000/LH4000
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