LG 42LV370S-ZB / 42LV3700-ZC / 42LV370S-ZC / 42LV375G-ZC / 42LV375S-ZC / 42LV375W-ZC (CHASSIS:LD12B) Service Manual ▷ View online
Checking order when there is no audio
①
②
③
① Check the contact condition of 24V connector of Main Board
② Measure the 24V input voltage supplied from Power Board (If there is no input voltage, remove and check the
connector)
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.
GND and output terminal, the speaker is normal.
Established
date
date
Electronics 6-3
Standard Repair Process Detail Technical Manual
Revised
date
date
2008. 2 . 1
LCD TV
Error
symptom
symptom
Voltage and speaker checking method in case of audio error
Content
C. Audio error_
Wrecked audio/discontinuation/noise
25/33 - 9/13
Checking order
1.
Check the DC 5V on the 3.5V_ST terminal. (Pin 6)
2. 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.
Input voltage terminal: 3.5V_ST (Pin 6)
Remote controller receiver terminal: IR (Pin 9)
Remote controller receiver terminal: IR (Pin 9)
Established
date
date
Electronics 6-3
Standard Repair Process Detail Technical Manual
Revised
date
date
2008. 2 . 1
LCD TV
Error
symptom
symptom
Remote controller operation checking method
Content
D. Function error_ No response in remote controller,
key error
26/33 - 10/13
①
②
Checking order
1.
Check the DC 5V on the 3.5V_ST terminal. (Pin 6)
2. 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.
Input voltage terminal: 3.5V_ST (Pin 6)
Remote controller receiver terminal: IR (Pin 9)
Remote controller receiver terminal: IR (Pin 9)
Established
date
date
Electronics 6-3
Standard Repair Process Detail Technical Manual
Revised
date
date
2008. 2 . 1
LCD TV
Error
symptom
symptom
Remote controller operation checking method
Content
D. Function error_ No response in remote controller,
key error
26/33 - 10/13
①
②
Checking order
1.
Check the DC 5V on the 3.5V_ST terminal. (Pin 6)
2. 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.
Input voltage terminal: 3.5V_ST (Pin 6)
Remote controller receiver terminal: IR (Pin 9)
Remote controller receiver terminal: IR (Pin 9)
Established
date
date
Electronics 6-3
Standard Repair Process Detail Technical Manual
Revised
date
date
2008. 2 . 1
LCD TV
Error
symptom
symptom
Remote controller operation checking method
Content
D. Function error_ No response in remote controller,
key error
26/33 - 10/13
①
②
