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Standard Repair Process Detail Technical Manual
LCD TV
<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 right reserved.
Only for training and service purposes
Error
C. Audio error_No audio/Normal video
symptom
Voltage and speaker checking method
Content
when there is no audio
24 Pin
1
Power on
②
3
20V (24V)
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)
2
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
ⓒ LG Electronics. Inc.2009
A25
LGE Internal Use Only
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