LG 47LM6400 Service Manual page 154

Standard Repair Process Detail Technical Manual
LCD TV
<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.
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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
②
3
5
7
9
②
11
13
15
17
19
21
23
24 Pin (Power Board ↔ Main Board) - 공통
SMAW200-H24S (YEONHO)
Power on 2 20V (24V)
20V (24V) 4 20V (24V)
GND 6 GND
GND GND
8
3.5V 10 3.5V
3.5V 12 3.5V
GND
GND 14
GND
GND 16
Inverter On/off
12V 18
Lamp : A-Dim
12V 20
LED : N.C
PWM Dim #1
12V 22
GND/P_DIM2 24 Error-out
77 / 79
Established
2010. 12 .14
date
Revised
date
①
③
A25
LGE Internal Use Only