Voltage And Speaker Checking Method When There Is No Audio - LG 42LB65 Series Service Manual

Standard Repair Process Detail Technical Manual
symptom
LCD TV
Content
24 Pin
1 Power on
3 3.5V
5 3.5V
7 GND
9 24V
11 GND
13 12V
15 12V
17 GND
19 GND
21 GND
23 L/DIM0_MOSI
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 © 2014 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
(Power Board ↔ Main Board)
SMAW200-H24S5
2
4
6
8
10
12
14
16
18
20
22
24
[LD42B models]
①
Inverter On
PWM#1
3.5V
PWM#2
24V
GND
12V
24V
GND
GND
L/DIM0_VS
L/DIM0_SCLK
A25
Established
2014. 01 .20
date
Revised
date
[LD42A models]
①
③
③
A25
LGE Internal Use Only