LG 55LM9600 Service Manual page 108

Standard Repair Process Detail Technical Manual
LCD TV
<XXLM9600>
ALEF LED
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
24 Pin (Power Board ↔ Main Board)
Power on
1
②
24V
3
GND
5
7 GND
②
9 3.5V
11 3.5V
13 GND
15 GND
17 12V
19 12V
21 12V
23 PWM Dim #2 24
Established
24V
2
24V
4
GND
6
8 GND
10 3.5V
12 3.5V
GND
14
V-sync
16
18 Inverter On/off
20 N.C
22 PWM Dim #1
Error-out
A25
2011. 12 .14
date
Revised
date
①
③
A25
LGE Internal Use Only