LG 42LN5200 (CHASSIS:LT36M) Service Manual ▷ View online
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
Checking order
1, 2. Check IR cable condition between IR & Main board.
3. Check the st-by 3.3V on the terminal 6.
4. When checking the Pre-Amp when the power is in ON condition, it is normal when the
4. When checking the Pre-Amp when the power is in ON condition, it is normal when the
Analog Tester needle moves slowly, and defective when it does not move at all.
Standard Repair Process Detail Technical Manual
Remote controller operation checking method
D. Function error_ No response in remote controller,
key error
key error
<LN5200 MODELS>
A17
Established
date
Revised
date
Error
symptom
Content
LCD TV
P600
1
GND
2
KEY1
3
KEY2
4
St 3.5V
5
GND
6
RED_LED
7
IR
8
GND
③
④
2013. 04 .24
Checking order
1, 2. Check IR cable condition between IR & Main board.
3. Check the st-by 3.3V on the terminal 6.
4. When checking the Pre-Amp when the power is in ON condition, it is normal when the
4. When checking the Pre-Amp when the power is in ON condition, it is normal when the
Analog Tester needle moves slowly, and defective when it does not move at all.
Standard Repair Process Detail Technical Manual
Remote controller operation checking method
D. Function error_ No response in remote controller,
key error
key error
<LN5200 MODELS>
A17
Established
date
Revised
date
Error
symptom
Content
LCD TV
P600
1
GND
2
KEY1
3
KEY2
4
St 3.5V
5
GND
6
RED_LED
7
IR
8
GND
③
④
2013. 04 .24