LG DM5360K Service Manual page 28

NO SOUND
There is no sound output in the AUX FUNCTION, repair the set according to the following guide.
5-3. IN THE AUX FUNCTION
5-3-1. Solution
Please check and replace IC402 on MAIN board.
5-3-2. How to troubleshoot (Countermeasure)
1) Check AUDIO_RIN, AUDIO_LIN signals to IC402 pin23, 24.
2) Check if BCK, MCLK and LRCK are entered from IC800 to IC402.
3) Check if DATA is entered from IC402 to IC800.
- If no signal, check +3.3 V (ADC) for IC402. If is NG, replace it a new one.
4) Check if the digital audio AMP block is okay. Refer to "Digital Audio AMP" guide on Item 5-1.
- If AMP is damaged, replace it with a new one.
5-3-3. Service hint (Any picture/ Remark)
< MAIN board top view >
ONE POINT REPAIR GUIDE
IC402 IC402
3-11
C417 R887 47K
AUX_L
225P
C416 R886 47K
AUX_R
225P
C456
MICBIAS
25
104P
C419
AIN6A
TUN_L 26
225P
C418
AIN6B
TUN_R 27
225P
PGAOUTA
28
PGAOUTB
29
NC
30
NC
31
AGND2
32
NC
33
NC
34
NC
35
C466
VLS
36
104P
R1E1
33R
BCK, MCLK, BCK, MCLK,
LRCK, DATA LRCK, DATA
< Audio circuit >
VCC5V
L104
300R
12
AIN1B
11
AIN1A
ADC_3.3V
C421
10
AIN2B
BT_R
225P
C420
9
AIN2A
BT_L
225P
8
AIN3B
IC402
L103
7
CS5346 AIN3A
300R
C463
6
RST
104P
5
VLC
R456 10K
4
AD1/CDIN
C452
R457 10K
3
AD0/CS
106P
R458 4.7K
2
SCL/CCLK
R459 4.7K
1
SDA/CDOUT
4.7K
R453
C447
22P