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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.
Standard Repair Process Detail Technical Manual
Voltage and speaker checking method
when there is no audio
C. Audio error_No audio/Normal video
<84LM96>
A25-3
Established
date
Revised
date
Error
symptom
Content
LCD TV
A25
①
②
③
2012. 08 .30
SLAVE PSU
24 Pin (Power Board ↔ Main Board)
1
Power on
2
24V
3
24V
4
24V
5
GND
6
GND
7
GND
8
GND
9
3.5V
10
3.5V
11
3.5V
12
3.5V
13 GND 14
GND
15 GND 16
GND
17 12V 18
Inverter On/off
19 12V 20
A-DIM
21 12V 22
P-DIM
23 GND 24 Error-out
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Only for training and service purposes
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