LG DM5360K Service Manual page 29

NO SOUND
There is no sound output in the TUNER FUNCTION, repair the set according to the following guide.
5-4. IN THE TUNER FUNCTION
5-4-1. Solution
Please check and replace IC401 on MAIN board.
5-4-2. How to troubleshoot (Countermeasure)
1) Check if TUL_L/R is entered from pin14, 13 of IC401 to IC402 pin26, 27.
- If no signals, check +3.3 V for tuner power.
Check if the TUNER control signals (TUN_RST, TUN_SDA and TUN_SCL) are entered from IC100 to IC401.
- If it doesn't work, replace TUNER with a new one.
2) Check if 32.768 kHz CLOCK (X401).
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 with 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.
5-4-3. Service hint (Any picture/ Remark)
X401 X401
< MAIN board top view >
ONE POINT REPAIR GUIDE
3-12
X401
T_XO
32.768KHz
C412
22P
< Audio circuit >
< Waveform of X401 (32.768 kHz) >
T_XI
C413
22P