3-17
ONE POINT REPAIR GUIDE
NO SOUND
There is no sound output in the AUX FUNCTION, repair the set according to the follow-
ing 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)
IC202
PT_L to pin21
MCS _LRCK to R219
MCS_MCLK to R220
MCS_BCK to R216
ADC/MIC_DATA to R215
PT_R to pin22
AUX
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 >
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