LG CJS98F User Manual

3-20
< MAIN board top view >
IC200
IC200
PTB_L to pin21
PTB_L to pin21
PTB_R to pin22
PTB_R to pin22
ONE POINT REPAIR GUIDE
NO SOUND
There is no sound output in the PORT. IN function, repair the set according to the following guide.
9-2. PORT. IN FUNCTION
9-2-1. Solution
Replace IC200 on MAIN board.
9-2-2. How to troubleshoot (Countermeasure)
1) Check PT_L/ R signal from FRONT board to MAIN board.
2) Check if PT_L/ R is entered pin1 & pin3 of CN201.
3) Check PT_L/R signals to IC201(pin9, pin10).
4) Check if ADC_BCK, ADC_LRCK & DAC_MCLK are entered from IC501 to IC201.
5) Check if ADC_DATA is entered from IC201 to IC501.
 If no signal, check +5 V & +3.3 V(ADC) for IC201. If is NG, replace it a new one.
6) Check the following I2S signal flow from IC501 to IC202.
 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.
7) Check if the digital audio AMP block is okay.
 If AMP is damaged, replace it with a new one.
9-2-3. Service hint (Any picture/ Remark)
T-
IC501
IC600
PWM
MCS_BCK
MCS_LRCK
IC200
POT. IN
ADC_DATA
MCS_MCLK
POT_L/R
Front
Board
IR AMP
MIX_DATA_OUT
< PORT. IN function signal fl ow diagram >

LG CJS98F Specifications

General

Brand	LG
Model	CJS98F
Category	Stereo System
Language	English