LG 86UH9500 Service Manual page 135

Standard Repair Process Detail Technical Manual
symptom
Content
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
Voltage and speaker checking method
when there is no audio
1 20V
3 20V
5 GND
7 12V
9 GND
②
11 GND
13 PWR-On
15 GND
17 12V
19 20V
21 GND
23 DRV-ON
2 20V
4 20V
6 GND
8 12V
10 GND
12 GND
14 P-DIM2
16 12V
18 12V
20 20V
22 GND
24 P-DIM1
①
Main B/D Side
Pin map reversed
A21
Established
date
Revised
date
A21
LGE Internal Use Only