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Standard Repair Process Detail Technical Manual
symptom
Content
<ALL MODELS>
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 © 2015 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
18 Pin
1
3
5
7
②
9
11
13
15
17
(Power Board ↔ Main Board)
Power on
2
DRV-ON
3.5V
4
P-DIM
3.5V
6
3.5V
GND
8
N.C
24V
10
24V
GND
12
GND
12V
14
12V
12V
16
N.C
GND
18
GND
Established
date
Revised
date
①
③
A25
LGE Internal Use Only
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