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Standard Repair Process Detail Technical Manual
symptom
Content
1. Check the connect condition of Main board and Power board.
2. Measure the 13.2V 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
②
Established
date
Revised
date
①
③
1
2
3
4
A21
SPK_R-
SPK_R+
SPK_L-
SPK_L+
Copyright © 2020 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
A21
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