LG 49LX340H - Page 15

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LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
9. External Speaker Out
ok
ok
Check Output Signal JK3400
4,5 pin.
Replace Phone Jack(JK3400)
ok
No
Check JK3400
Replace Phone Jack
if found to be damaged.
ok
No
Check External Speaker
Replace External speaker.
ok
No
Check AMP IC(IC3400) Power 24V
L3400
No
Replace L3400
Check AMP IC(IC3400) Output
L3401, L3402
No
replace AMP IC(IC901)
Check Mstar External AUDIO output
C3401, C3402
No
Replace Mstar(IC101) or Main Board.
ok
Check AMP IC(IC3400) Mute High
R3403, 4pin
No
Check signal line. Or replace Mstar(IC101)