LG 47LW6500-UA Service Manual page 71

11. Trouble shooting - No audio (AV)
Check AV Cable for damage
or open conductor
ok
Check Audio OSD
(Audio OSD active or inactive mode?)
ok
Check JK1105
ok
Check Audio Master clock // AUD_LRCH
AUD_LRCK, AUD_SCK(AMP pin20,21,22)
ok
Check Audio AMP Mute (pin19)
Check Audio AMP voltage
+3.3V,+24V_AMP
Check output L1703,4,7,8
AMP output
Follow procedure & refer to Audio signal block
Diagram
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Only for training and service purposes
No (Inactive)
No
No
ok
ok
No
ok
Check R821 & R822, JK803
Replace JK1105
Replace BCM3549
Replace Audio AMP TAS5727
LGE Internal Use Only