LG 47LV3700 - Standard Repair Process Detail Technical Manual; C. Audio error_No audio;Normal video - Voltage and speaker checking method when there is no audio

ⓒ LG Electronics. Inc.2009
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.
Standard Repair Process Detail Technical Manual
Voltage and speaker checking method
when there is no audio
C. Audio error_No audio/Normal video
<ALL MODELS>
A25
Established
date
Revised
date
Error
symptom
Content
LCD TV
A25
①
②
③
SMAW200-H24S (YEONHO)
Error-out24N.C
• Lamp SCANNING
Model
: PWM Dim #2
23
PWM Dim #1
2212V21
Lamp : A-Dim
LED : N.C
2012V19
Inverter On/off1812V17
GND16GND15
GND14GND13
3.5V123.5V11
3.5V103.5V9
GND8GND7
GND6GND5
20V (24V)420V (24V)3
20V (24V)2Power on1
24 Pin (Power Board ↔ Main Board) - 공통
②
2010. 12 .14
Copyright ⓒ 2011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only