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50PT330-UB, 50PT350-UD, 50PT350C-UD (CHASSIS:PU14K) - LG TV Service Manual (repair manual). Page 54

Read LG 50PT330-UB / 50PT350-UD / 50PT350C-UD (CHASSIS:PU14K) Service Manual online

Check  Signal (JK604  #3)
Check SPDIF signal (R641)
Replace Mstar IC
Y
N
Y
Replace JK604
< SPDIF waveform – sample >
- Defend on the input signal.
Optical Audio
Trouble Shooting Guide
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