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42CQ610H (CHASSIS:LA1EZ) - LG TV Service Manual (repair manual). Page 18

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8. Analog RF Audio Trouble Shooting guide
Check RF cable & signal
Check TU1003 Pin1
(SIF output)
Y
Check Audio AMP output
L503,L504,L505,L506
Y
Check IC501
Y
Check C250
(SIF signal to IC101)
Replace Tuner
N
Replace L503,L504,L505,L506
Replace IC501
N
N
Replace IC101
Y
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