Checking Order When There Is No Audio - LG 79UB980T-TA Service Manual

Standard Repair Process Detail Technical Manual
symptom
LCD TV
Content
<65UB980T-TA>

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
1 PWR ON
3 P_DIM #1
5 3.5V
7 3.5V
9 GND
11 12V
13 12V
②
15 12V
17 GND
19 24V
21 24V
23 GND
25 SCLK
27 SIN
Established
2 DVR_ON
4 PDIM #2
6 GND
8 3.5V
10 GND
12 12V
14 12V
16 GND
①
18 24V
20 24V
22 24V
24 GND
26 GND
28 VSYNC
A21
2014.02.05
date
Revised
date
1 H_SPK_R- 2 H_SPK_R+
3 H_SPK_L- 4 H_SPK_L+
5 SPK_R- 6 SPK_R+
7 SPK_L- 8 SPK_L+
9 C_SPK_R- 10 C_SPK_R+
11 C_SPK_L- 12 C_SPK_L+
A21
③
LGE Internal Use Only