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42LD550 (CHASSIS:LA02B) - LG TV Service Manual (repair manual). Page 57

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15. Headphone Audio
Check Component Cable
for damage or open conductor.
Check HP/BT OUT_Signal
(input of IC300)
ok
ok
No
Replace C304 ~ 307
14. SPDIF Audio
Check AV Cable for damage
for damage or open conductor
Check JK8400
& Signal Line
ok
ok
No
Replace Jack
Follow procedure 
‘8. All source audio’
trouble shooting guide.
Follow procedure 
‘8. All source audio’
trouble shooting guide.
Check  L302 (+3.3V_NORMAL)
ok
No
Replace L302
Check IC300 & HP_L/R_OUT
ok
No
Replace IC300
Check JK300
& Signal Line
ok
No
Replace Jack (JK300)
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