LG 42LH35FD (CHASSIS:LJ91A) Service Manual ▷ View online
8. HDMI Video Trouble Shooting
Check Signal Format
Is it supported signal?
Y
Check HDMI Jack
JK500, JK501, JK503
N
Y
Y
Check HDMI Cable
Replace Jack
Check IC601 Voltage Level
+1.8V_HDMI, +3.3V_HDMI
N
Replace one of
L601/L602/R665/R663
Y
Check I2C Signal
R670/R671
/R605/R606/R616/R617/R639/R64
2
N
Replace It & Recheck
Y
Maybe BCM3556(IC100)
has problems
9. All Source Audio Trouble Shooting
Make sure you can’t hear any
audio
Y
Check Connector P500
N
Y
Y
Check Speaker
Replace Connector
Check Signal
L504, L506
N
Replace one of
L508/L509/L510/L511/L504/L506
& Recheck
Y
Check IC500 Power
20V, 3.3V, 1.8V
L500,L501,L502,L503,IC504
N
Replace It & Recheck
Y
Check BCM3556 I2S Output
R148, R149, R150
N
Replace It & Recheck
Y
Maybe BCM3556(IC100)
has problems
Replace Speaker
N
N
Maybe NTP3100 has problems.
Replace It
10. Digital TV Audio Trouble Shooting
Check video output
Y
Follow procedure All source
audio trouble shooting
Maybe BCM3556 internal audio
DSP has problems. Replace It
N
Follow procedure digital TV
video trouble shooting
N
11. Analog TV Audio Trouble Shooting
Follow procedure analog TV
video trouble shooting
N
Check video output
Y
Check SIF Signal
TU1101 #8 Pin
N
Y
N
Y
Check SIF Signal
C141
N
Replace one of R113/R128
& Recheck
Y
Follow procedure All source
audio trouble shooting
N
Maybe BCM3556 audio block has
problems. Replace It
N
Y
Check Tuner Power
(5.0V, 2.5V, 3.3V, 1.2V)
Replace one of
L1108/L1105/L1100/L1107/L1109
& Recheck
Maybe Tuner(TU1101) has
problems
Replace one of
R1124,R1125,C1137,Q1101,R112
9
Recheck
Check SIF Signal
C1139
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