LG 49SM5KE Service Manual page 44

Standard Repair Process Detail Technical Manual
symptom
Monitor Signage
Content
[All models]
1 PWR-On
3
5 D 13.2 V
7 A 13.2 V
9
DRV-On
11
(Inverter –On)
Checking order when there is no audio
① Check the contact condition of or 13V connector of Main Board
② Measure the 13V 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
12 Pin (Power Board ↔ Main Board)
SMAW200-H12S5K(BK)
2
4
GND
6
8
10
GND
12
Established
Revised
date
①
PWM#2
D 13.2 V
D 13.2 V
A 13.2 V
GND
PWM#1
A14
date
< Main Ass'y>
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Only training and service purposes.
A13