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Standard Repair Process Detail Technical Manual
LCD TV
<ALL MODELS>
Edge LED 32/42/47"
Checking order when there is no audio
① Check the contact condition of 20V 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 ⓒ 2010 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
Power
1
②
3
5
7
9
11
13
15
17
19
21
23
Pin layout (24P)
24V
(IOP & Edge 55")
2
on
20V (
)
Edge 42/47
24V
4
24V
GND
6
GND
GND
8
GND
3.5V
10
3.5V
3.5V
12
3.5V
GND
14
GND
GND
16
NC
12V
18
Inverter ON
LE : NC
12V
20
IOP : PWM Dim #1
LE : PWM Dim #1
12V
22
IOP : NC
NC
24
Error-out
A25
Established
2010. 2 .19
date
Revised
date
③
A25
①
LGE Internal Use Only
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