LG 55LV5400 (CHASSIS:LA12E) Service Manual ▷ View online
8. Trouble shooting - No Audio (all audio source)
Check the TV Speaker Menu
(Menu -> Sound -> TV Speaker)
On
ok
ok
Check Output Signal P1702
1, 2, 3, 4 pin.
Replace Audio AMP IC(IC1702)
ok
No
Check Connector & P1702
Replace connector
if found to be damaged.
ok
No
Check speaker resistance
and connector damage.
Replace speaker.
ok
No
Off
Toggle the Menu
Check AMP IC(IC1702) Power
*24V, 3.3V
No
Check Regulator L1709,L1710,L1711
Check Mstar I2S Output
R1754,5,6
No
Check signal line.
Or replace BCM( IC101)
Check AUDIO_MASTER_CLK
R1753
No
Replace BCM( IC101) or Main Board.
ok
Check AMP I2C Line
R1710,1711
No
Check signal line.
Or replace BCM( IC101)
Check RF Cable & Signal
Check Tuner 3.3V Power
L2103
Replace L2103
Check Tuner 1.26V Power
IC2103 2 pin : 1.26V
Check IF_P/N Signal
TU2101 17,18 Pin
Replace IC2103
Check Tuner 5V Power
L2101,L2104
ok
ok
ok
ok
No
No
No
Bad Tuner. Replace Tuner.
Check IC507
No
Replace IC507
No
Replace L2101,2104
ok
9. Trouble shooting - No audio (Digital TV audio)
Follow procedure
‘8. All source audio’
trouble shooting guide.
ok
Check RF Cable & Signal
Check Tuner 3.3V Power
L2103
Replace L2103
Check Tuner 1.2V Power
IC2103 2 pin : 1.2V
Replace IC2103.
ok
ok
No
No
Check Tuner 5V Power
L2101,L2104
ok
Check IC507
No
Replace IC507
No
Replace L2101,2104
ok
10. Trouble shooting - No audio (Analog TV audio)
Check TU_SIF path
Including Q2104 TR buffer to LGE35230
ok
Check SIF Signal
TU2101 9th Pin
ok
No
Bad Tuner. Replace Tuner.
Follow procedure
‘8. All source audio’
trouble shooting guide.
ok
No
Replace component
11. Trouble shooting - No audio (AV)
Check AV Cable for damage
or open conductor
Check Audio OSD
(Audio OSD active or inactive mode?)
ok
ok
No (Inactive)
Check R821 & R822, JK803
Check Audio AMP Mute (pin19)
Replace JK1105
No
ok
Check Audio Master clock // AUD_LRCH
AUD_LRCK, AUD_SCK(AMP pin20,21,22)
Replace BCM3549
Check JK1105
No
ok
Check Audio AMP voltage
+3.3V,+24V_AMP
ok
ok
Check output L1703,4,7,8
AMP output
ok
Replace Audio AMP TAS5727
No
Follow procedure & refer to Audio signal block
Diagram
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