LG 65UG8709 - Page 114

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
1
PWR ON
2
DVR_ON
3
P_DIM #1
4
PDIM #2
5
3.5V
6
GND
7
3.5V
8
3.5V
9
GND
10
GND
11
12V
12
12V
13
12V
14
12V
15
12V
16
GND
17
GND
18
24V
19
24V
20
24V
21
24V
22
GND
23
GND
24
NC
1
SPK_R-
2
SPK_R+
3
SPK_L-
4
SPK_L+
<65UF850V-ZB>
Error symptom
Content
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