LG 55UJ634 Series Service Manual page 76

Standard Repair Process Detail Technical Manual
symptom
Content
Checking order when there is no audio
1.Check the contact condition of or 13V connector of Main Board
2. Measure the 13V 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
Power board side
1
3
5
7
9
②
11
13
15
17
VSYNC 2 SIN
GND 4 SCLK
DRV_ON 6 P-DIM
GND 8 GND
①
A13V 10 A13V
13V 12 13V
GND 14 13V
PWR_ON 16 P-DIM2
GND 18 GND
A21
Established
date
Revised
date
③
1 SPK_R-
2 SPK_R+
3 SPK_L-
4 SPK_L+
A21