Checking order when there is no audio
1.Check the contact condition of or 13V connector of Main Board
2. Measure the 13V 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.
Standard Repair Process Detail Technical Manual
Voltage and speaker checking method
when there is no audio
C. Audio error_No audio/Normal video
A21
Established
date
Revised
date
Error
symptom
Content
A21
①
②
③
1
DRV_ON
2
PDIM1
3
GND
4
GND
5
A13
6
A13
7
D13
8
D13
9
GND
10 D13
11 PWR_ON
12 PDIM2
1
SPK_R-
2
SPK_R+
3
SPK_L-
4
SPK_L+
<ALL MODELS>
1
VSYNC
2
SIN
3
GND
4
SCLK
5
DRV_ON
6
PDIM1
7
GND
8
GND
9
A13
10 A13
11 D13
12 D13
13 GND
14 D13
15 PWR_ON
16 PDIM2
17 GND
18 GND
UJ6*
UJ7*
Copyright © 2017 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Summary of Contents for 43UJ750 -ZB Series
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