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50PM4700-DA (CHASSIS:PB22A) - LG TV Service Manual (repair manual). Page 68

Read LG 50PM4700-DA (CHASSIS:PB22A) Service Manual online

Check  Signal (JK505  #3)
Check SPDIF signal (R506)
Replace BCM2112
Y
N
16. OPTIC Audio Out Trouble Shooting
Y
Maybe BCM2112 (IC100)
has problems. Replace It.
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