LG 26LG3100 (CHASSIS:LD91M) Service Manual ▷ View online
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
A21
Established
date
Revised
date
Error
symptom
Content
LCD TV
A21
Check Procedure at No Sound
①
②
① Check 15V connector contacting point statement of main board.
② Measure 15V input voltage supplied by Power Board (remove connector and check it out if there is no input
voltage)
voltage)
③ Put SPK terminal into tester RX1 -> when touching GND and output terminal, if make Cheuk
Cheuk sound, it is OK.
2009. 7 .30
②
③
Check Procedure at No Sound
① 24V connector contacting statement of Main Board.
② Measure 24V of input voltage supplied by Power Board (If there is no input voltage, remove connector -> check
it out)
it out)
③ Put SPK terminal into tester RX1 -> when touching GND and output terminal, if make Cheuk
Cheuk sound, it is OK.
Standard Repair Process Detail Technical Manual
A22
Established
date
Revised
date
Error
symptom
Content
LCD TV
Voltage and SPK Check Method at Sound Defect
C. Audio error_Sound distortion/cut
A22
2009. 7 .30
①
②
②
③
Standard Repair Process Detail Technical Manual
Remote controller operation checking method
D. Function error_ No response in remote controller,
key error
A23
Established
date
Revised
date
Error
symptom
Content
LCD TV
A23
Check Procedure
1. Check DC5V (P402 PIN #6) onto 5V_ST Terminal
2. When checking Pre-Amp at Power On Statement,
If an indicator of analogue tester is moving a little, It is OK. But If not, it is Pre-Amp defect.
(P402 PIN #8)
(P402 PIN #8)
Input voltage terminal : 5V_ST, The remote receiving terminal : IR
2009. 7 .30
Standard Repair Process Detail Technical Manual
Remote controller operation checking method
D. Function error_ No response in remote controller,
key error
A23
Established
date
Revised
date
Error
symptom
Content
LCD TV
A23
Check Procedure
1. Check DC5V (P402 PIN #6) onto 5V_ST Terminal
2. When checking Pre-Amp at Power On Statement,
If an indicator of analogue tester is moving a little, It is OK. But If not, it is Pre-Amp defect.
(P402 PIN #8)
(P402 PIN #8)
Input voltage terminal : 5V_ST, The remote receiving terminal : IR
2009. 7 .30