Voltage And Speaker Checking Method When There Is No Audio - LG 42LB55 series Service Manual

Standard Repair Process Detail Technical Manual
Error
symptom
LCD TV
Content
<ALL MODELS>
Checking order
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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Only for training and service purposes
C. Audio error_No audio/Normal video
Voltage and speaker checking method
when there is no audio
18 Pin (Power Board ↔ Main Board)
②
SMAW200-H18S5
1 Power on
3 3.5V
5 3.5V
7 GND
9 24V
11 GND
13 12V
15 12V
17 GND
Established
date
Revised
date
2 DRV ON
4 PDIM#1
6 3.5V
8 PDIM#2
10 24V
12 GND
14 12V
16 NC
18 GND
2012. 01 .14
①
③
< Main Ass'y>
LGE Internal Use Only
A16