Voltage And Speaker Checking Method When There Is No Audio - LG 65UH8500 Service Manual

Standard Repair Process Detail Technical Manual
Checking order when there is no audio
① Check the contact condition of cable or connector
② Measure the 24V input voltage supplied from Power Board
(If there is no input voltage, remove and check the connector)
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Only for training and service purposes
Error
C. Audio error_No audio/Normal video
symptom
Voltage and speaker checking method
Content
when there is no audio
1 24V
3 24V
5 GND
7 12V
9 GND
②
11 GND
13 PWR-On
15 GND
17 12V
19 24V
21 GND
23 DRV-ON
25 GND
27 VSINC
2 24V
4 24V
6 GND
8 12V
10 GND
①
12 GND
14 P-DIM2
Main B/D Side
Pin map reversed
16 12V
18 12V
20 24V
22 GND
24 P-DIM1
26 SCLK
28 SIN
A21
Established
date
Revised
date
③
1 SPK_R-_FT
3 SPK_L-_FT
5 SPK_R-_CT
7 SPK_L-_CT
A21
2 SPK_R+_FT
4 SPK_L+_FT
6 SPK_R+_CT
8 SPK_L+_CT
LGE Internal Use Only