LG 55UB820T Service Manual page 87

Standard Repair Process Detail Technical Manual
symptom
LCD TV
Content
<XXUB83/820X-XX>
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.
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
②
11 12V
13 12V
15 12V
17 GND
19 24V
21 24V
23 GND
25 SCLK
27 SIN
Established
Revised
2 DVR_ON
4 PDIM #2
6 GND
①
8 3.5V
10 GND
12 12V
14 12V
16 GND
18 24V
20 24V
22 24V
③
24 GND
26 GND
28 VSYNC
A21
2014.02.05
date
date
1 SPK_R-
2 SPK_R+
3 SPK_L-
4 SPK_L+
A21