LG RCS606F Service Manual

3-28
ONE POINT REPAIR GUIDE
NO SOUND
There is no sound output in the MIC IN FUNCTION, repair the set according to the
following guide.
5-8. IN THE MIC IN FUNCTION
5-8-1. Solution
Please check and replace IC603, IC605 on MAIN board.
5-8-2. How to troubleshoot (Countermeasure)
1) Check MIC_SIG signal to Pin 27 of CN104.
 If no signal, Check the signal to Pin 5 of CN3M01 on the MIC board. Check it from Pin5 of CN302 on
the VOLUME board. Check if the signal is entered from Pin3 of CN301 to MAIN board.
2) Check if MIC_SIG is entered from Pin27 of CN104 to Pin3 to IC605 (MIC AMP).
3) Check if the amplified signal is entered from Pin4 of IC605.
 If no signal output, check +12 V for IC605, replace IC605 with a new one if it has a problem.
4) Check if MIC_BCK & MIC_LRCK is entered from IC507 to IC603 and DAC_MLCK from IC501 to IC603.
Check if MIC_DATA is entered from Pin 9 of IC603I to Pin 7 of IC602.
 If no signal, check +5 V & +3.3 V for IC603. If it is abnormal, change replace it a new one.
6) Check the following I2S signal flow from IC603 to IC602.
 If there is any trouble, check the power for each IC. If the signals are abnormal, replace it a new one.
7) Check if the digital audio AMP block is okay. Refer to “Digital Audio AMP” guide on Item 5-2.
 If AMP is damaged, replace it with a new one.
5-8-3. Service hint (Any picture / Remark)
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IC501
MLC9800
IC602
PS9850
PWM
IC801
FS502B
BEAT BOX
AMP IC
TAS5631
DAC_BCK
DAC_LRCK
IC603
AK5358
DAC_DATA DAC_MCLK
MIC IN
MIC_DATADAC_MCLK
MIC
Board
MIG_SIG
BEAT_DATA
IC605
S4308
< Signal check point >
< MIC IN function signal fl ow >

LG RCS606F Specifications

General

Brand	LG
Model	RCS606F
Category	Stereo System
Language	English