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50PX950N-ZA, 50PX960-ZA (CHASSIS:PD02D) - LG TV Service Manual (repair manual). Page 63

Read LG 50PX950N-ZA / 50PX960-ZA (CHASSIS:PD02D) Service Manual online

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Analog TV Audio Trouble Shooting
Check video output
Follow procedure All source audio trouble 
shooting 
(on page 25)
Y
Follow procedure analog TV video 
trouble shooting
(on page 15)
N
Replace BCM3556CP (IC100)
Check TU601 (pin3) for 5V
Replace IC504
N
Y
Check SIF signal (TU601 #9)
Replace Tuner
N
Y
Check SIF signal (R650)
Check SIF line
N
Y
29/37
< SIF waveform – sample >
- Defend on the input signal.
Y
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