LG 50LN54 Series Service Manual page 75

Standard Repair Process Detail Technical Manual
symptom
LCD TV
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 © 2013 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
②
18 Pin (Power Board ↔ Main Board) -
②
1 Power on
3
5
7
9
11
13
15
17
Check the DC 24V, 12V,
3.5V.
2 DRV ON
3.5V 4 PDIM#1
3.5V 6 PDIM#2
GND 8 GND
24V 10 24V
GND 12 GND
12V 14 12V
12V 16 N.C
18
GND GND
Established
2013. 01 .09
date
Revised
date
①
공통
③
①
③
A16
LGE Internal Use Only