3-16
ONE POINT REPAIR GUIDE
NO SOUND
There is no sound output in the PORTABLE FUNCTION, repair the set according to
the following guide.
5-6. IN THE PORTABLE FUNCTION
5-6-1. Solution
Please check and replace IC201 on MAIN board.
5-6-2. How to troubleshoot (Countermeasure)
1) Check PT_L/R signals to IC201 (Pin9, 10).
2) Check if MCS_BCK, MCS_LRCK, & MCS_MCLK are entered from IC501 to IC201.
3) Check if ADC_DATA is entered from IC201 to IC501.
If no signal, check +5 V & +3.3 V(ADC) for IC201. If NG, replace it a new one.
4) Check the following I2S signal flow from IC501 to IC601. (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.
5) 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.
5-6-3. Service hint (Any picture / Remark)
PTB˻R to R228
PTB˻L to R229
PWM
TAS5548
TAS5612LA
FR,FL
Woofer
12.288MHZ
TAS5612LA
DSP IC501
MLC3730
176PIN BGA
IC201
CS5346
Portable
PTB_L/R
< Signal check point >
< PORTABLE function signal fl ow >
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