Read LG 55EA9800-SA (CHASSIS:EJ34D) Service Manual online
Standard Repair Process Detail Technical Manual
Voltage and speaker checking method
C. Audio error_No audio/Normal video
A21
Established
date
Revised
Error
symptom
Content
LCD TV
2013.01.31
Voltage and speaker checking method
when there is no audio
A21
date
Content
①
③
①
②
24 Pin
(Power Board ↔ Main Board)
1
Power on
2
INV ON
3
3.5V
4
PDIM#1
5
3.5V
6
PDIM#2
7
GND
8
GND
9
24V
10
24V
③
11
GND
12
GND
13
12V
14
12V
15
12V
16
24V
17
GND
18
GND
19
GND
20
GND
21
GND
22
L/DIM0_V8
23 L/DIM0_MOSI 24 L/DIM0_SCLK
Checking order when there is no audio
①
Check the contact condition of or 24V connector of Main Board
①
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.
A21
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