LG 65LF6300 Service Manual page 111

Standard Repair Process Detail Technical Manual
Error symptom
Content
<ALL MODELS>
Checking order when there is no audio
① Check the contact condition of or 13V connector of Main Board
② Measure the 13 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.
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Only for training and service purposes
C. Audio error_No audio/Normal video
Voltage and speaker checking method
when there is no audio
1 PWR ON/OFF
3 GND
5 D13.2V
②
7 A13.2V
9 GND
11 DRV ON/OFF
13 GND
15 GND
17 SPI-SIN
Established
date
Revised
date
2 PDIM #2
4 D13.2V
6 D13.2V
8 A13.2V
10 GND
12 PDIM #1
14 GND
16 V-SYNC
18 SPI-SCLK
A25
①
③
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