LG 75NANO90UNA Service Manual page 71

Standard Repair Process Detail Technical Manual
symptom
Content
Output Voltage
STBY 8.4Vrms (typ)
13.2V 12.54V ~ 13.86V
20V 18.00V ~ 22.00V
Checking order when there is no audio
1. Check the contact condition of or 13.2V /20V connector of Main Board.
2. Measure the 13.2V input voltage supplied from Power Board
(If there is no input voltage, remove and check the 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.
Error
C. Audio error_No audio/Normal video
Voltage and speaker checking method
when there is no audio
Current
Output
17mA(0~17mA)
VLED
4.0A (0.1~4.0A)
1.0A (0.1~1.0A)
②
Inch Voltage Typycal
75 73.983V~97.560V 81.3V
A13
Established
date
Revised
date
①
③
1 SPK_ R-FT
2 SPK_ R+FT
3 SPK_ L-FT
4 SPK_ L+FT
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A13