LG 65UB930T Service Manual

Standard Repair Process Detail Technical Manual
Voltage and speaker checking method
C. Audio error_No audio/Normal video
A21
Established
date
Revised
Error
symptom
Content
LCD TV
2014.02.05
Voltage
and
speaker
checking
method
when there is no audio
A21
date
Content
< XXUB98>
1 H_SPK_R- 2 H_SPK_R+
3 H_SPK_L- 4 H_SPK_L+
5
SPK R
6
SPK R+
③
1 PWR ON 2 DVR_ON
3 P_DIM #1 4 PDIM #2
5 3.5V 6 GND
7
35V
8
35V
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+
②
7
3
.
5V
8
3
.
5V
9 GND 10 GND
11 12V 12 12V
13 12V 14 12V
①
15 12V 16 GND
17 GND 18 24V
19 24V 20 24V
21 24V 22 24V
23 GND 24 GND
25 SCLK 26 GND
27 SIN 28 VSYNC
Checking order when there is no audio
①
Check the contact condition of or 24V connector of Main Board
①
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.
A21
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Only for training and service purposes
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LG 65UB930T Specifications

General

Brand	LG
Model	65UB930T
Category	LED TV
Language	English