Read LG 42LN5200 (CHASSIS:LT36M) Service Manual online
Checking order when there is no audio
① Check the connection state and 24V at Darin pin of Q405 (①)
② If Output Voltage(24V) of Q405 isn’t created,
Measure L421(24V) to confirm whether Input voltage is supplied from adaptor or not.
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
when there is no audio
C. Audio error_No audio/Normal video
<LN5200 MODELS>
A16
Established
date
Revised
date
Error
symptom
Content
LCD TV
2013. 04 .24
③
②
L421 : 24V
①
Q405 (Drain) : 24V Check Point
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