Read LG 47LN549E / 47LP620H (CHASSIS:LB3AZ) Service Manual online
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8. TV Audio
Check the voltage of Tuner 1.8V
IC2603 2pin : 1.8V
Check the IF_P/N signal TU2601~3
10/11pin
Implement the “7. Audio of all input”
Of Malfunction guide.
Check the RF cable of RF signal
Check the voltage of Tuner 3.3V : L2606
Exchange the L2606.
Exchange the Tuner.
Menu toggle
Exchange the L2606.
No
No
No
No
Yes
Yes
Yes
Yes
9. AUDIO IN (Component/DVI Audio) (PC Audio:LN549E Only)
Implement the “7. Audio of all input”
Of Malfunction guide.
Check the cable is defective.
Check the signal of JK1102.
Exchange AUDIO IN Jack.
No
Yes
Yes
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