LG 43LW540S - Page 22

- 22 -
LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Check AMP IC(IC3400) Power 24V
L3400
No
No
Yes
Check Mstar External AUDIO output
C3401, C3402
Replace L3400
Replace SoC(IC101) or Main Board.
Check AMP IC(IC3400) Mute High
R3403, 4pin
No
Yes
Check signal line. Or replace
SoC(IC101)
No
Yes
Check AMP IC(IC3400) Output
L3401, L3402
replace AMP IC(IC3400)
Check Output Signal JK3400
4,5 pin.
No
Yes
Replace Phone Jack(JK3400)
No
Yes
Check JK3400
Replace Phone Jack
if found to be damaged
Check External Speaker
No
Yes
Replace External speaker.
10. External Speaker Out