55LM660S, 55LM660T (CHASSIS:LD22E) — LG TV Service Manual (repair manual). Page 116

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Checking method
1. Press the MENU button on the remote controller
2. Select the AUDIO function of the Menu
3. Select TV Speaker from Off to On
Standard Repair Process Detail Technical Manual
Checking method in menu when there is no audio
C. Audio error_No audio/Normal video
<ALL MODELS>
A24
Established 
date 
Revised 
date 
Error 
symptom
Content
LCD  TV
2010. 12 .14
Checking order when there is no audio
① Check the contact condition of or 24V connector of Main Board
② Measure the 24V input voltage supplied from Power Board
(If there is no input voltage, remove and check the connector)
③ Connect the tester RX1 to the speaker terminal and if you hear the Chik Chik sound when you touch the GND 
and output terminal, the speaker is normal. 
Standard Repair Process Detail Technical Manual
Voltage and speaker checking method 
when there is no audio
C. Audio error_No audio/Normal video
<ALL MODELS>
A25
Established 
date 
Revised 
date 
Error 
symptom
Content
LCD  TV
24 Pin
 
(Power Board ↔ Main Board)
SMAW200-H24S (YEONHO)
1
Power on
2
20V (24V)
3
20V (24V)
4
20V (24V)
5
GND
6
GND
7
GND
8
GND
9
3.5V
10
3.5V
11
3.5V
12
3.5V
13
GND
14
GND
15
GND
16
GND
17
12V
18
Inverter On/off
19
12V
20
Lamp : A-Dim
LED : N.C
21
12V
22
PWM Dim #1
23
GND/P_DIM2
24
Error-out
2010. 12 .14
Checking order
1, 2.  Check IR cable condition between IR & Main board.
3.      Check the st-by 3.3V on the terminal 6.
4.     When checking the Pre-Amp when the power is in ON condition, it is normal when the Analog 
Tester needle moves slowly, and defective when it does not move at all. 
Standard Repair Process Detail Technical Manual
Remote controller operation checking method
D. Function error_ No response in remote controller,
key error
<ALL MODELS>
A27
Established 
date 
Revised 
date 
Error 
symptom
Content
LCD  TV
P4102
1
SCL
2
SDA
3
GND
4
KEY1
5
KEY2
6
St 3.5V
7
GND
8
RED_LED
9
IR
10
GND
2010. 12 .14
Standard Repair Process Detail Technical Manual
Sequence of the Vcom adjustment
D. VCOM Adjustment
1. Case 
 
LCD module change
 
T-Con board change 
2. Equipment 
 
Service Remote controller
3. Adjust sequence
 
Press the ‘adj’ key  
 
select V-COM 
 
As pushing the right or the left button on the remote controller, And find the V-COM value Which is no or
minimized the Flicker.
(If there is no flicker at default value, Press the exit key and finish the VCOM adjustment.)
 
Push the OK key to store the value. Then the message “Saving OK” is pop.
 
Press the exit key to finish V-COM adjustment.
A28
Established 
date 
Revised 
date 
Error 
symptom
Content
LCD  TV
2010. 12 .14
Standard Repair Process Detail Technical Manual
Sequence of the Vcom adjustment
D. VCOM Adjustment
1. Case 
 
LCD module change
 
T-Con board change 
2. Equipment 
 
Service Remote controller
3. Adjust sequence
 
Press the ‘adj’ key  
 
select V-COM 
 
As pushing the right or the left button on the remote controller, And find the V-COM value Which is no or
minimized the Flicker.
(If there is no flicker at default value, Press the exit key and finish the VCOM adjustment.)
 
Push the OK key to store the value. Then the message “Saving OK” is pop.
 
Press the exit key to finish V-COM adjustment.
A28
Established 
date 
Revised 
date 
Error 
symptom
Content
LCD  TV
2010. 12 .14

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