LG 42LN5200 (CHASSIS:LT36M) Service Manual ▷ View online
Standard Repair Process Detail Technical Manual
Checking method when power is ON
B. Power error _No power
A13
Established
date
Revised
date
Error
symptom
Content
LCD TV
2013. 04 .24
Check the POWER_ON/OFF_1 (IC404 5
th
PIN or R419)
IC404 5
th
PIN or R419
Entry method
1. Press the IN-START button of the remote
controller for adjustment
2. Check the entry into adjustment item 3
Standard Repair Process Detail Technical Manual
POWER OFF MODE checking method
B. Power error
_Off when on, off whiling viewing
<ALL MODELS>
A14
Established
date
Revised
date
Error
symptom
Content
LCD TV
2012. 11 .17
Checking method
1. Press the MENU button on the remote controller
2. Select the AUDIO function of the Menu
3. Select TV Speaker from Off to On
Standard Repair Process Detail Technical Manual
Checking method in menu when there is no audio
C. Audio error_No audio/Normal video
<LA58xx>
A15
Established
date
Revised
date
Error
symptom
Content
LCD TV
2012. 01 .14
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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