LG 55G2 Service Manual page 118

Standard Repair Process Detail Technical Manual
LCD TV
<XXG2-UG>
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 ⓒ 2012 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 (Power Board ↔ Main Board) -
SMAW200-H24S (YEONHO)
Power on
1
②
24V
3
5 GND
GND
7
9 3.5V
3.5V
11
GND
13
15 GND
17 12V
19 12V
21 12V
PWM Dim #2
23
Established
date
Revised
date
공통
①
24V
2
4 24V
6 GND
GND
8
10 3.5V
3.5V
12
14 GND
16 V-sync
③
DRV_ON
18
20 N.C
PWM Dim #1
22
24 Error-out
A25
2011. 12 .14
A25
LGE Internal Use Only