LG 60LM6450 Service Manual page 76

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
② 1
3
5
7
9
②
11
13
15
17
19
21
23 GND/P_DIM2
(Power Board ↔ Main Board) - Common
SMAW200-H24S (YEONHO)
Power on 2 20V (24V)
20V (24V) 4 20V (24V)
GND 6 GND
GND 8 GND
3.5V 10 3.5V
3.5V 12 3.5V
GND 14 GND
GND 16 GND
12V 18 Inverter On/off
12V 20 Lamp : A-Dim
LED : N.C
12V 22 PWM Dim #1
24 Error-out
Established
2010. 12 .14
date
Revised
date
①
③
A25