LG 55LB6500 - Page 120

Standard Repair Process Detail Technical Manual
Voltage and speaker checking method
when there is no audio
C. Audio error_No audio/Normal video
A25
Established
date
Revised
date
Error
symptom
Content
LCD TV
2013. 11 .30
24 Pin (Power Board ↔ Main Board) - 공통
SMAW200-H24S5
1
Power on
2
INV ON
when
there
is
no
audio
<ALL MODELS>
date
①
1
Power
on
2
INV
_
ON
3
3.5V
4
PDIM #1
5
3.5V
6
3.5V
7
GND
8
PDIM #2
②
9
24V
10
24V
11
GND
12
GND
13 12V 14
12V
②
15 12V 16
24V
17 GND 18
GND
19 GND 20
GND
21 GND 22
L/DIM0_VS
23 L/DIM0_MOSI 24 L/DIM0_SCLK
Checking order when there is no audio
③
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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