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Standard Repair Process Detail Technical Manual
symptom
Content
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 right 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
24Pin(Power Board ↔ Main Board)
②
1
PWR ON
2
INV CTL
3
DPC
4
PDIM#2
5
3.5V
6
7
3.5V
8
9
GND
10
11
12V
12
13
12V
14
15
12V
16
17
GND
18
12V_ON
19
24V
20
21
24V
22
23
GND
24
A12
Established
date
Revised
date
①
GND
3.5V
GND
12V
12V
GND
③
24V
24V
GND
1
SPK_R-
3
SPK_L-
A21
1
SPK_R+
4
SPK_L+
LGE Internal Use Only
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