LG RCS606F Service Manual page 52

NO SOUND
There is no sound output in the IPOD FUNCTION, repair the set according to the fol-
lowing guide.
5-5. IN THE IPOD FUNCTION
5-5-1. Solution
Please check and replace IC201, IC202, IC203 on MAIN board.
5-5-2. How to troubleshoot (Countermeasure)
1) Check USB VBUS_+5V to Pin3 of CN201 after inserting the iPod to IPOD Docking System.
If no power, check if IPOD_P_CTRL to Pin3 of IC203 change Low to High.
2) Check if IPOD Audio L/R signals are entered from Pin11 & 12 of CN201 to Pin10 & 6 of IC201.
3) Check if the IPOD Audio L/R that some noise is removed to IC201 are output from Pin1 & 5 of IC201.
If no signal, replace the IC with a new one.
4) Check IPOD_L/R signals from 1 & 5 of IC201 to IC202(Pin26, 27).
5) Check if ADC_BCK, ADC_LRCK & DAC_MCLK are entered from IC501 to IC202.
6) Check if ADC_DATA is entered from IC202 to IC501.
If there is no signal, check +5 V & +3.3 V(ADC) for IC202. If is NG, replace it a new one.
7) Check the following I2S signal flow from IC501 to IC602. (Refer to Item 5-1.)
If there is any trouble, check the power for each IC. The power is normal but , if the signal waveform to
the IC is distorted or no signal, replace it with a new one.
8) Check if the digital audio AMP block is okay. Refer to "Digital Audio AMP" guide on Item 5-2.
If an AMP is damaged, replace it with a new one
5-5-3. Service hint (Any picture / Remark)
IPOD_L/R
IC202
CS5346
DAC_MCLK ADC_DATA
DAC_BCK
IC501
DAC_LRCK
MLC9800
DAC_DATA DAC_MCLK
IC801
BEAT_DATA
FS502B
BEAT BOX
< iPod function signal fl ow >
ONE POINT REPAIR GUIDE
iPod
AMP IC
IC602
TAS5631
PS9850
PWM
3-25
< Signal check point >