LG 43LF5900 Service Manual page 71

Standard Repair Process Detail Technical Manual
symptom
Content
<ALL MODELS>
Checking order when there is no audio
① Check the contact condition or A13V connector of Main Board
② Measure the A13V input voltage supplied from Power Board
(If there is no input voltage, remove the cable 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.
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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
12 Pin
1 Power on
3
5
②
7
9
11 DRV_ON
(Power Board ↔ Main Board)
SMAW200-H12S5K
2 PDIM #2
GND 4 D13V
D13V 6 D13V
A13V 8 A13V
GND 10 GND
12 PDIM #1
Established
date
Revised
date
①
③
A25
LGE Internal Use Only