LG 55LW9500 Service Manual page 113

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 © 2011 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
② 1
3
5
7
②
9
11
13
15
17
19
21
23 N.C
• Lamp SCANNING
Model
: PWM Dim #2
(Power Board ↔ Main Board) - 공통
SMAW200-H24S (YEONHO)
Power on 2 20V (24V)
20V (24V) 4 20V (24V)
GND 6 GND
GND 8 GND
3.5V 10 3.5V
3.5V 12 3.5V
GND 14 GND
GND 16 GND
12V 18 Inverter On/off
12V 20 Lamp : A-Dim
LED : N.C
12V 22 PWM Dim #1
24 Error-out
A25
Established
2010. 12 .14
date
Revised
date
①
③
A25
LGE Internal Use Only