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 IC400, IC402 on MAIN board.
5-5-2. How to troubleshoot (Countermeasure)
1) Check if TUL_L/R is entered from pin13, 14 of IC402 to IC403 pin1, 12.
If no signals, check +3.3 V for tuner power.
Check if the TUNER control signals (TUN_RST, TUN_SDA AND TUN_SCL) are entered from IC105 to IC402
If it doesn’t work, replace TUNER with a new one.
2) Check if MCS_TX_BCK, MCS_RX_MCLK and MCS_TX_LRCK are entered from IC105 to IC400.
3) Check if MCS_RX_ADATA is entered from IC400 to IC105.
If no signal, check +3.3 V (ADC) for IC400. If is NG, replace it with a new one.
4) Check the following I2S audio signal flow from IC105 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)
PWM
PS9
860
TAS5612L
FR,FL
Z
H
M
6
7
5
.
4
2
DSP IC105
MLC3730S
176PIN BGA
IC403 CD4052
TUNER
TU_L/R
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
USB 1.1
Host/Device
ARM
926EJS
16KB
I-Cache
16KB
D-Cache
400Mhz
DSP
133Mhz
SRAM29KB
I-Cache 8KB
D-Cache 8KB
Boot ROM (20KB)
SDRAM
Controller
IC401 CD4558
IC400 CJC5357
IC700
IC402 Si4702
< Signal check point >
< TUNER IN function signal
fl
ow >
TUN_L to C435
TUN_L to C435
TUN_R to C434
TUN_R to C434
IC402
IC402
Summary of Contents for CM2460
Page 11: ...1 10 ...
Page 13: ...2 2 ...
Page 15: ......
Page 17: ...3 SPEAKER SECTION A60R A60L ...
Page 46: ...3 29 13 14 4 USB USB_5V D D Figure 4 14 13 ...
Page 47: ...3 30 ...
Page 54: ...3 58 3 57 SMPS P C BOARD BOTTOM VIEW ...
Page 55: ...3 60 3 59 2 MAIN P C BOARD TOP VIEW ...
Page 56: ...3 62 3 61 MAIN P C BOARD BOTTOM VIEW ...
Page 57: ...3 64 3 63 3 DISPLAY P C BOARD TOP VIEW ...
Page 58: ...3 66 3 65 DISPLAY P C BOARD BOTTOM VIEW ...
Page 59: ...3 68 3 67 4 KEY P C BOARD TOP VIEW BOTTOM VIEW ...
Page 60: ...3 70 3 69 ...