LG 32LW5700 Manual page 83

Standard Repair Process Detail Technical Manual
LCD TV
<Under 26">
Edge LED 22/26
Copyright ⓒ 2011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Error
C. Audio error_No audio/Normal video
symptom
Voltage and speaker checking method
Content
when there is no audio
1
3
5
7
9
11
13
15
17
19
21
23
Pin layout (24P)
1 24V
2 24V
3 24V
4 24V
5 24V
6 GND
7 GND
8 GND
9 GND
10 GND
11 NC
12 INV_ON
13 PWM_DIM
14 ERROR_OUT
Pin layout (24P)
24V (IOP & Edge
Power
55")
2
on
20V (Edge 42/47)
24V 4 24V
GND 6 GND
8
GND GND
3.5V 10 3.5V
3.5V 12 3.5V
GND 14 GND
GND 16 NC
12V 18 Inverter ON
LE : NC
12V 20
IOP : PWM Dim #1
LE : PWM Dim #1
12V 22
IOP : NC
NC 24 Error-out
A25
Established
2011. 01 .18
date
Revised
date
Checking order when there is no audio
① Check the contact condition of
20V 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.
A25
LGE Internal Use Only