LG 70LA8600-SA (CHASSIS:LJ34D) Service Manual ▷ View online
C. Audio error
No audio/ Normal video
Established
date
Revised date
9/14
LCD TV
Error
symptom
Standard Repair Process
2012. 01 .14
No audio
Screen normal
Check user
menu >
Speaker off
Off
N
Y
Check audio B+ 24V
of Power Board
Normal
voltage
Y
N
☞
A15
☞
A16
Cancel OFF
Replace Power Board and repair parts
Check Speaker
disconnection
N
Y
Replace Speaker
Replace MAIN Board
End
Disconnection
Replace Speaker
12 / 97
C. Audio error
Wrecked audio/ discontinuation/noise
Established
date
Revised date
10/14
LCD TV
Error
symptom
Standard Repair Process
2012. 01 .14
→ abnormal audio/discontinuation/noise is same after “Check input signal” compared to No audio
Wrecked audio/
Discontinuation/
Check and replace
Check audio
☞
A16
Discontinuation/
Noise for
all audio
speaker and
connector
Wrecked audio/
Discontinuation/
Y
Normal
voltage?
Check input
signal
-RF
-External Input
signal
Signal
normal?
Y
Check audio
B+ Voltage (24V)
Replace Main B/D
N
Noise only
for D-TV
Wrecked audio/
Discontinuation/
Noise only
Replace Power B/D
N
voltage?
signal
Replace Main B/D
N
Noise only
for Analog
Wrecked audio/
Discontinuation/
Noise only
(When RF signal is not
received)
Request repair to external
cable/ANT provider
Replace Main B/D
End
Noise only
for External Input
Connect and check
other external device
N
Y
Normal
audio?
(In case of External
Input signal error)
Check and fix
external device
Check and fix external device
13 / 97
D. Function error
Remote control & Local switch checking
Standard Repair Process
Established
date
Revised date
11/14
LCD TV
Error
symptom
2012. 01 .14
Y
1. Remote control(R/C) operating error
Check R/C itself
Normal
Check & Repair
Normal
Check B+ 3 5V
☞
A17
Normal
N
Check IR
Normal
Y
☞
A17
Replace
Main B/D
Y
☞
A17
Y
N
Check R/C itself
Operation
Normal
operating?
Y
Check R/C Operating
Check & Replace
Cable connection
Connector solder
Normal
operating?
Check B+ 3.5V
On Main B/D
Normal
Voltage?
Close
Check 3.5v on Power B/D
☞
A4
Check IR
Output signal
Normal
Signal?
N
Repair/Replace
IR B/D
N
Normal
operating?
Close
If R/C operate,
Explain the customer
cause is interference
When turn off light
in room
Baterry of R/C
Replace Power B/D or
Replace Main B/D
(Power B/D don’t have problem)
IR B/D
Replace R/C
cause is interference
from light in room.
N
14 / 97
D. Function error
External device recognition error
Established
date
Revised date
12/14
LCD TV
Error
symptom
Standard Repair Process
2012. 01 .14
Check technical
information
- Fix information
S/W Version
N
Technical
information?
Check
input
signal
Signal
input?
Y
External Input and
Component
Recognition error
Replace Main B/D
- S/W Version
Y
g
N
Check and fix
external device/cable
RGB,HDMI/
DVI, Optical
Recognition error
Replace Main B/D
Fix in
accordance
i h
h i l
with technical
information
15 / 97
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