LG 55LM860V Service Manual page 114

Standard Repair Process Detail Technical Manual
symptom
LCD TV
Content
<XXLM9600>
ALEF LED
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.
Copyright © 2012 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Error
C. Audio error_No audio/Normal video
Voltage and speaker checking method
when there is no audio
24 Pin (Power Board ↔ Main Board)
1 Power on
②
3 24V
GND
5
GND
7
②
3.5V
9
3.5V
11
13 GND
15 GND
17 12V
19 12V
21 12V
23 PWM Dim #2 24
2 24V
4 24V
GND
6
GND
8
3.5V
10
3.5V
12
14 GND
16 V-sync
18 Inverter On/off
N.C
20
22 PWM Dim #1
Error-out
A25
Established
2011. 12 .14
date
Revised
date
①
③
A25
LGE Internal Use Only