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Standard Repair Process Detail Technical Manual
symptom
Content
Output
Voltage
STBY
7.02~8.56Vrms
13.2V
12.54V ~ 13.86V
20V
18.00V ~ 22.00V
VLED
101.4V
93.6V ~ 120V
Checking order when there is no audio
1. Check the contact condition of or 13.2V /20V connector of Main Board.
2. Measure the 20V 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
Current
18mA(0~18mA)
4.0A (0.1~4.0A)
1.0A (0.1~1.0A)
2.7A(0~2.7A)
②
Established
date
Revised
date
①
③
1
SPK_ R-FT
2
SPK_ R+FT
3
SPK_ L-FT
4
SPK_ L+FT
Copyright © 2020 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
A13
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