LG 42LM6200 Service Manual page 127

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 ⓒ 2012 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
24 Pin
1
②
3
5
7
9
②
11
13
15
17
19
21
23 GND/P_DIM2
(Power Board ↔ Main Board) - 공통
SMAW200-H24S (YEONHO)
Power on 20V (24V)
2
20V (24V) 20V (24V)
4
GND GND
6
GND GND
8
3.5V 3.5V
10
3.5V 3.5V
12
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
81 / 153
Established
2010. 12 .14
date
Revised
date
①
③
A25
LGE Internal Use Only