Samsung HT-BD1255, Service Manual

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7-2 Samsung Electronics
Schematic Diagram
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7-1 Overall Block Diagram
B/E
BCM7440P
Video
Decoder
Audio
Decoder
ETHER
MAC
USB1/2
USB1
Ethernet
Digital
Video
Motor
Driver
NAND
FLASH
64MB
SATA
DDR2 DDR2 DDR2 DDR2
128MB (32M x 16b x 2ea) 256MB (64M x 16 x 2ea)
1 M E M 0 M E M
VIDEO
FILTER
MM1757
CVBS
YPbPr
HDMI TX
24Bit
Y/Pb/Pr
HDMI TX
SIL9134
CVBS
ADC
AK5367
DIR
AK4113
Optical In
I2S 5.1ch PCM
I2S
SPI I/F
System
U-com
LC87F5NC8A
DISPLAY
Pick-up / Loader
AUX
Tuner
Bluetooth
TX Module
I-Pod
CP CHIP
UART
SMPS
POWER
64M
SDRAM
Flash
ROM
PWM
DRIVER
PS9830B
Power
Stage
Power
Stage
Power
Stage
I2S
5.1ch
CEC MICOM
MC80C0316
PWM
I2S
Lo, Ro
D/M 2ch
USB2
For wireless LAN
For Local Storage & USB Host
IPOD Y/C VIDEO
CVBS/YPbPr
SDRAM
Serial
Flash
F/E
BCM7620
Y/C
MIXER
IPOD ANALOG
AUDIO L/R
SYSTEM
U-com
UART
CEC
SPI I/F
UART
I-Pod
Externel
DOCKING ANALOG AUDIO
INPUT ADC
Wireless
TX Module
I2S Rear 2ch
48KHz
Wireless
RX Module
I2C
UART
UART
Audio
DSP
TMP320D788
Sampling
Rate
Converter
CS8421

MAIN SYSTEM (BCM7440P) is connected to whole HT-BD1250 function IC. For HDMI 1080P, BCM7440P transfer the
digital video signal with 24bit to HDMI TX chip SIL9134. BCM7440P doesn’t need external up scaling IC because it has a
own internal scalar. About it has internal video DAC, so it transfer the analog signal to MM1757, BCM7440P.
MM1757 are video filter and amp.

AUDIO DSP (TM320D788) is connected to MAIN SYSTEM. They get the DIGITAL audio signal from main system with
bit stream status. And after decoding the signal, they send the digital signal, which is already decoded, to DIGITAL AMP
PWM driver IC.

MAIN SYSTEM MICOM control BCM7440P, AUDIO DSP MICOM, CEC. He gets all information from BCM7440P, and
then transfer the information to AUDIO DSP MICOM. They have a communication among them with HOST ↔ SLAVE
Interface. And MAIN SYSTEM MICOM gets the information from User’s remote control. So whenever he get the
information, he displays it on the VFD.

The loader transfer the source audio, video data to BCM7440P.

Both of USB are available, but front USB is for LOCAL STORAGE of PROFILE 1.1/2.0 and USB HOST function, whire
Rear USB is for wireless LAN Dongle.

DIGITAL IN 1, 2 (SPDIF IN), AUX IN and Tuner IN are each connected to DIR and ADC IC. And then after transforming
DIGITAL SIGNAL (SPDIF IN is DIGITAL signal), the audio signal transfers to AUDIO DSP.