LG CM8440 Series User Manual

3-17
ONE POINT REPAIR GUIDE
NO SOUND
There is no sound output in the AUX FUNCTION, repair the set according to the fol-
lowing guide.
6-2. IN THE AUX FUNCTION
6-2-1. Solution
Please check and replace IC202 on MAIN board.
6-2-2. How to troubleshoot (Countermeasure)
1) Check AUX_L/R signals to IC202 (Pin7, 8).
2) Check if MCS_BCLK, MCS_LRCLK, & MCS_MCLK are entered from IC501 to IC202.
3) Check if ADC/MIC_DATA is entered from IC202 to IC501.
 If no signal, check +5 V & +3.3 V(ADC) for IC202. If is NG, replace it a new one.
4) Check the following I2S signal flow from IC501 to IC600.
 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.
5) Check if the digital audio AMP block is okay.
 If AMP is damaged, replace it with a new one.
6-2-3. Service hint (Any picture / Remark)
w{sGGYX
w{yGGYY
pjYWY
hkjVtpjkh{hGGGyYX\tjzijrGGyYX]
tjz syjrGGy YX`
tjztjsrGGyYYX
AUX
{T
IC501
MLC3730
IC600
TAS5548
PWM
MCS_BCK
MCS_LRCK
IC202
CS5346
ADC/MIC_DAT A
MCS_MCLK
AUX_L/R
IR AMP
IRS2092+IRF6775
MIX_DATA_OUT
< Signal check point >
< AUX function signal fl ow >

LG CM8440 Series Specifications

General

Brand	LG
Model	CM8440 Series
Category	Stereo System
Language	English