ViewSonic N4251w-1M, Service Manual

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165 MHz and video resolutions up to 1080p and UXGA. The MT8293 supports the
DVD-Audio standard, including 7.1- surround audio at 96kHz and stereo audio at 192kHz.
The built-in High-bandwidth Digital Content Protection (HDCP) decryption engine secures the
digital link for transmission of valuable high-definition video and audio. Built-in HDCP
self-test engine simplifies manufacturing testing.
MT8202
LCD Controller IC
MT8293
Digital audio interface
EEPROM for
EDID
EEPROM for
HDCP Key
HDMI
Conn
ector
12c interface
DVI
0~23,DE,Hsync,
Vsync,clk
CSDL,CSDA
PWR5V
DSDL,DSDA
KSDL,KSDA
12C interface
12C interface
CP10 interface
HDMI_HPD
TMDS0~3
HDMI_PLUG_POWER
MT8293 has 3 I2C interfaces.
LCD Controller IC use the CSDL/CSDA interface to access MT8293 registers.
MT8293 use KSDL/KSDA interface to read HDCP key from the EEPROM.
HDMI transmitter use DSDL/DSDA to access MT8293 HDCP related register.
HDMI Transmitter will pull high HDMI_PLUG_POWER (pin 18 in connector) when the
cable is connected. LCD Controller will pull high HDMI_HPD (pin 19 in connector) to info
the HDMI transmitter that the receiver is ready. The HDMI transmitter sends the video &
audio to MT8293 via 3 Data TMDS pairs & 1 CLOCK TMDS pairs.
Digital video signals are directly output from the MT5351AG and MT8293 and then transfer
them to the MT8202 for advanced processing.
DDR
SDRAM
FLASH
MT6351
(Mpegdecoder)
ATSC RF
TUNER
MT5112
(Demod.)
HDMI
MT8293
(HDMI Bx)
MT8202
DDR
SDRAM
ViewSonic Corporation
Confidential - Do Not Copy
N4251w-1M
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