LG 60LN57 Series Service Manual page 93

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 © 2013 LG Electronics. Inc. All rights 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
3
5
②
7
②
9
11
13
15
17
19
21
23 L/DIM0_MOSI
(Power Board ↔ Main Board)
SMAW200-H24S
Power on 2 Inverter On/off
3.5V 4 PWM Dim #1
3.5V 6 PWM Dim #2
GND 8
24V 10
GND 12
12V 14
12V 16
GND 18
GND 20
GND 22 L/DIMO_VS
24 L/DIM0_SCLK
53 / 88
Established
2012. 12 .06
date
Revised
date
GND
24V
GND
12V
24V
③
GND
GND
A25
①
LGE Internal Use Only