LG 42LB5800 - Page 71

Standard Repair Process Detail Technical Manual
C Audio error No audio/Normal video
Established
Error
t
2014 1 6
18 or 24 Pin
(Power Board
↔
Main Board)
-
공
Voltage and speaker checking method
when there is no audio
C
.
Audio
error
_
No
audio/Normal
video
<ALL MODELS>
A25
date
Revised
date
symp
t
om
Content
LCD TV
①
2014
.
1
.
6
18
or
24
Pin
(Power
Board
Main
Board)
공
통
FREE LGP-14PL1-IT
1 PWR ON/OFF 2 INV ON
3 3.5V 4 PDIM #1
②
5 3.5V 6 GND
7 GND 8 PDIM #2
9 24V 10 24V
11 GND 12 GND
13
12V
14
12V
②
13
12V
14
12V
15 12V 16 24V or N.C
17 GND 18 GND
19 GND 20 GND
21 GND 22 L/DIMO_VS
③
23 L/DIMO_MOSI 24 L/DIMO_SCLK
The Wafer,18Pin and 24Pin, is used by operating LocalDimming or not
LocalDimming
24Pi f i li d i /D d i B/D
Checking order when there is no audio
-
24Pi
n wa
f
er
i
s app
li
e
d
operat
i
ng L
/D
at power an
d
ma
i
n
B/D
- 18Pin wafer is applied not operating L/D at power and main B/D
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
C h RX1 h k i l d if h h “Chik Chik” d h h h GND
29 / 97
③
C
onnect t
h
e tester
RX1
to t
h
e spea
k
er term
i
na
l
an
d
if
you
h
ear t
h
e
“Chik
Chik”
soun
d
w
h
en you touc
h
t
h
e
GND
and output terminal, the speaker is normal.
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