LG 55LA86 Series Service Manual page 125

Standard Repair Process Detail Technical Manual
symptom
LCD TV
Content
<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.
Error
C. Audio error_No audio/Normal video
Voltage and speaker checking method
when there is no audio
24 Pin
1
3
5
②
7
②
9
11
13
15
17
19
21
23 L/DIM0_MOSI
(Power Board ↔ Main Board)
SMAW200-H24S
Power on 2 Inverter On/off
3.5V 4 PWM Dim #1
3.5V 6 PWM Dim #2
GND 8
24V 10
GND 12
12V 14
12V 16
GND 18
GND 20
GND 22 L/DIMO_VS
24 L/DIM0_SCLK
Established
2012. 12 .06
date
Revised
date
GND
24V
GND
12V
24V
③
GND
GND
A25
①