LG 50UL3G Service Manual page 51

Standard Repair Process Detail Technical Manual
symptom
Monitor Signage
Content
<ALL MODELS>
Checking order when there is no audio
① Check the contact condition of or 13.2V 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
Established
date
Revised
date
①
VSINC SIN
GND SCLK
Drv_ON PDIM1
A-GND A-GND
A13 A13
D13 D13
D-GND D13
Pwr_ON PDIM2
D-GND D-GND
1 SPK_R-FT
2 SPK_R+FT
3 SPK_L-FT
4 SPK_L+FT
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< Main Ass'y>
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Only training and service purposes.
A16