LG 49UF690T-TC Service Manual page 86

Standard Repair Process Detail Technical Manual
symptom
<ALL MODELS>
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 © 2015 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
Content
when there is no audio
②
②
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
A21
Established
date
Revised
date
①
③
1 SPK_R-
2 SPK_R+
3 SPK_L-
4 SPK_L+
A21
LGE Internal Use Only