LG 55SK9000PUA Service Manual page 71

Standard Repair Process Detail Technical Manual
Error symptom
symptom
TV
Content
Content
Output Voltage
STBY 7.56Vrms ~ 9.24Vrms
13.2V 12.54V ~ 13.86V
20.0V 18V ~ 22V
Checking method without Audio
1.Check the contact condition of or 13.2V connector of Main Board
① Checking voltage 20V of Main Board
② Checking voltage 20V of Power Board
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.
Error
C. Audio error_No audio/Normal video C. Audio error_No audio/Normal video
Voltage and speaker checking method
Voltage and speaker checking method
when there is no audio when there is no audio
Current Output
17mA(0~17mA)
3.2A (0.1~3.2A VLED
0.8A (0.1~0.8A)
②
Inch Voltage Typycal
65 85.35~115.91 V 96.7V
55 68.28V~92.77V 77.4V
49 71.6V~96.6V 77.7V
A13
Established
date
Revised
date
①
③
1 SPK_R-FT 5 SPK_R-CF
2 SPK_R+FT 6 SPK_R+CF
3 SPK_L-FT 7 SPK_L-CF
4 SPK_L+FT 8 SPK_L+CF
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
A13 A21