LG 65LA970V-ZA / 65LA970W-ZA / 65LA9709-ZA (CHASSIS:LD34N) Service Manual ▷ View online
No audio
Screen normal
Check user
menu >
Speaker off
menu >
Speaker off
Off
N
Y
Cancel OFF
Check audio B+
24V of Power
Board
24V of Power
Board
Normal
voltage
voltage
Y
N
Replace Power Board and repair parts
Check
Speaker
disconnection
N
Y
Replace Speaker
Replace MAIN Board
End
C. Audio error
No audio/ Normal video
☞A20
☞A21+A18
Disconnection
Established
date
Revised date
8/16
LCD TV
Error
symptom
Standard Repair Process
8
2013.01.31
→ abnormal audio/discontinuation/noise is same after “Check input signal” compared to No audio
C. Audio error
Wrecked audio/ discontinuation/noise
Wrecked audio/
Discontinuation/
Noise for
all audio
Check and replace
speaker and
connector
Wrecked audio/
Discontinuation/
Noise only
for D-TV
Wrecked audio/
Discontinuation/
Noise only
for Analog
Wrecked audio/
Discontinuation/
Noise only
for External Input
Connect and check
other external
device
N
Y
Normal
audio?
Check and fix external device
Replace Power B/D
N
Y
Normal
voltage?
Check input
signal
-RF
-External Input
signal
Signal
normal?
(When RF signal is not
received)
Request repair to external
cable/ANT provider
Y
Check audio
B+ Voltage (24V)
Replace Main B/D
(In case of
External Input
signal error)
Check and fix
external device
Replace Main B/D
N
End
Established
date
Revised date
9/16
LCD TV
Error
symptom
Standard Repair Process
9
2013.01.31
☞A21+A18
D. Function error
Remote control & Local switch checking
Y
N
1. Remote control(R/C) operating error
Check R/C itself
Operation
Normal
operating?
Normal
operating?
Y
Close
Replace R/C
If R/C operate,
Explain the customer
cause is interference
from light in room.
Check R/C Operating
When turn off light
in room
Check & Replace
Baterry of R/C
Check & Repair
Cable connection
Connector solder
Connector solder
Normal
operating?
Check B+
3.5V
On Main B/D
☞A22
Normal
Voltage?
Close
N
N
Check 3.5v on Power B/D
Replace Power B/D or
Replace Main B/D
(Power B/D don’t have problem)
☞A18
Check IR
Output signal
Normal
Signal?
N
Y
Repair/Replace
IR B/D
N
☞A22
Replace
Main B/D
Y
☞A22
Standard Repair Process
Established
date
Revised date
10/16
LCD TV
Error
symptom
10
Y
2013.01.31
D. Function error
MR13 operating checking
Y
N
2. MR13(Magic Remocon) operating error
Check MR13
itself Operation
Normal
operating?
Normal
operating?
Y
Close
Check & Replace
Battery of MR13
Is show ok
message?
Press the
wheel
Is show ok
message?
Close
N
N
N
Y
Standard Repair Process
Established
date
Revised date
11/16
LCD TV
Error
symptom
11
Replace
MR13
Turn off/on the
set and press
the wheel
Press the back
key about 5sec
Close
* If you conduct the loop at 3times, change the M4.
Y
Check the
INSTART menu
RF Receiver ver
is “00.00”?
Y
Check & Repair
RF assy
connection
N
Down load the Firmware
* INSTART MENU14.RF
Remocon Test3. Firmware
download
Y
RF Receiver ver
is “00.00”?
N
Close
☞A23
☞A4
☞A4
2013.01.31
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