LG 79UF9500 - Audio Error_No Audio;Normal Video

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.
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
A21
①
②
③
23
PWR ON
24
DVR_ON
21
P_DIM #1
22
PDIM #2
19
3.5V
20
GND
17
3.5V
18
3.5V
15
GND
16
GND
13
12V
14
12V
11
12V
12
12V
9
12V
10
GND
7
GND
8
24V
5
24V
6
GND
3
24V
4
NC
1
GND
2
GND
1
SPK_R-
2
SPK_R+
3
SPK_L-
4
SPK_L+
<79UF77/95>
②
Error symptom
Content