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50PX950-UA, 50PX950-UF (CHASSIS:PU02B) - LG TV Service Manual (repair manual). Page 65

Read LG 50PX950-UA / 50PX950-UF (CHASSIS:PU02B) 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 BCM3549XS (IC501)
Check TU1400 (pin3) for 5V
Replace IC404 or IC406
N
Y
Check SIF signal (TU1400 #9)
Replace Tuner
N
Y
Check SIF signal (R1439)
Check SIF line
N
Y
< SIF waveform – sample >
- Defend on the input signal.
Y
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