3-15
ONE POINT REPAIR GUIDE
NO SOUND
There is no sound output in the TUNER FUNCTION, repair the set according to the following guide.
5-5. IN THE TUNER FUNCTION
5-5-1. Solution
Please check and replace IC202, TU200 on MAIN board.
5-5-2. How to troubleshoot (Countermeasure)
1) Check if TUNER_LR is entered from Pin1, 3 of TU200 to IC202(Pin27, 28).
If no signals, check +3.3 V for tuner power.
Check if the tuner control signals (CLK, DAT, CE, RST, SLT) are entered from IC500 to TU200.
If it doesn’t work, replace TUNER with a new one.
2) Check if MCS_BCK, MCS_LRCK, & MCS_MCLK are entered from IC500 to IC202.
3) Check if ADC_DATA is entered from IC202 to IC500.
If no signal, check +5 V & +3.3 V(ADC) for IC202. If is NG, replace it with a new one.
4) Check the following I2S audio signal flow from IC500 to IC700. (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.
5-5-3. Service hint (Any picture / Remark)
< TUNER IN function signal fl ow >
PWM
FR,FL
Woofer
12.288 MHZ
DSP IC500
176 PIN
BGA
IC202
TUNER_L /R
TUNER
A
Interrupt
controller
CDROM x8 speed
Decoder
NAND Controller
within BCH codec
14bits ECC
GDMA 3ch
ADC (12bit*5ch)
Timer, Watchdog
GPIO (72 Max)
SPI 4ch (Max)
RTC & Wake up
UART 4ch (Max)
I2C 2ch
SDHC-SDIO 4ch (Max)
USB 2.0 OTG
SRAM (10K)
Main Processor
Audio DSP-0
GDMA 2ch
I2S (7.1ch)
SPDIF (Rx, Tx)
ADPCM
PLL
Clock Controller
Reset Controller
Test Controller
Audio DSP-1
USB 1.1
Host/Device
ARM
926EJS
16KB
I-Cache
16KB
D-Cache
400Mhz
DSP
133Mhz
SRAM29KB
I-Cache 8KB
D-Cache 8KB
DSP
133Mhz
SRAM29KB
I-Cache 8KB
D-Cache 8KB
Boot ROM (20KB)
SDRAM
Controller
< Signal check point >
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