LG 47LH50 (CHASSIS:LA91L) Service Manual ▷ View online
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8. All Source Audio
Make sure you
can’t hear any audio.
can’t hear any audio.
First check the TV
SPEAKER Menu
SPEAKER Menu
Toggle the menu
NO
OK
Check Connector &
P2300
P2300
Replace connector
if found to be damaged.
if found to be damaged.
NO
Check speaker resistance
and connector damage.
and connector damage.
Replace speaker.
NO
OK
Check AUDIO_M_CLK
R2302
R2302
Replace BCM3549
(IC100) or Main board
(IC100) or Main board
NO
OK
Check Mstar I2S Output
R2304, R2305, R2306
R2304, R2305, R2306
Check signal line
Or replace IC100
Or replace IC100
NO
OK
Check IC2301 Power
*24V, 3.3V, 1.8V.
*24V, 3.3V, 1.8V.
Check Regulaor
IC2300.IC2404
IC2300.IC2404
NO
OK
Check Output Signal
P2300 1,2,3,4 PIN
P2300 1,2,3,4 PIN
Replace NTP(Audio AMP)
IC2301
IC2301
NO
OK
OK
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9. Digital TV Audio
Check Tuner 5V Power
TU2500 4Pin
TU2500 4Pin
Check IC2502
NO
Check Connector &
P2300
P2300
Replace connector
if found to be damaged.
if found to be damaged.
NO
Check speaker resistance
and connector damage.
and connector damage.
Replace speaker.
NO
OK
Check IF_P/N Signal
Replace Tuner.
NO
OK
Check Check
Demodulator Input
Clock(X1100-12MHz)
Demodulator Input
Clock(X1100-12MHz)
Replace X1100
NO
OK
Check IC1101Output
Replace IC1101
NO
OK
Check Output Signal
P2300 1,2,3,4 PIN
P2300 1,2,3,4 PIN
Replace NTP(Audio AMP)
IC2301
IC2301
NO
OK
OK
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10. Analog TV Audio
Check RF Cable
OK
Check Tuner 5V Power
TU2500 4Pin
TU2500 4Pin
Check IC2502
NO
Bad Tuner. Replace
Tuner.
Tuner.
NO
OK
Check SIF buffer signal.
Check SIF Signal line.
NO
OK
Follow procedure All
source audio
source audio
Replace BCM3549
(IC100) or Main board
(IC100) or Main board
NO
11. USB
Check Lamp blinking
Check USB 5V Power
(JK3401 1pin 5V Check)
(JK3401 1pin 5V Check)
NO
Check IC3400 1,6 pin
5V power
5V power
NO
Replace the IC3400
NO
OK
Check the supporting
format
format
Change to the supporting
format
format
NO
12. Networking problems (Netfix/Yahoo!)
Check ethernet.
(Is the internet supported?)
(Is the internet supported?)
OK
Check LAN Cable.
OK
Check JK3400
(Check Lamp blinking)
(Check Lamp blinking)
Check pin 2,5
(2.5V Power)
(2.5V Power)
NO
OK
Check IP Setting
Resetting IP
(Auto or Manual)
(Auto or Manual)
NO
OK
Function Execution
(Yahoo!/Netfix)
(Yahoo!/Netfix)
Ask to Yahoo!/Netfix CS.
NO
Replace Jack.
NO
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300
200
400
806
804
521
540
530
805
122
310
120
121
803
802
801
900
500
510
550
EXPLODED VIEW
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These
parts are identified by in the Schematic Diagram and EXPLODED VIEW.
It is essential that these special safety parts should be replaced with the same components as
recommended in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
parts are identified by in the Schematic Diagram and EXPLODED VIEW.
It is essential that these special safety parts should be replaced with the same components as
recommended in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
IMPORTANT SAFETY NOTICE
A2
LV1
A10
LV2
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