Toshiba TDP-MT700 Manual de servicio - Página 11

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MT700 Service Manual

4.1.1. Main Board

4.1.1.1. Overview

1. The Main Board includes five input connectors. They are HDMI input, component 1

input, component 2 input, S-video input, composite video input, RGBHV input and

download connector.

2. The Graphic port input includes (1) HDMI input connector, (2). Component

YPBPR1 and (3). Component YPBPR2. (4). RGBHV connector.

The HDMI input connector can accept digital RGB or YUV format signals. This

input can support 480p, 576p, 720p, 1080i video signals.

The Component 1 and Component 2 can accept analog YPBPR (480p, 576p,

720p, 1080i) signals.

Because a HDMI decoder (SII9993) is used, this projector also can decode HDCP

signals.

3. The Video port inputs (included Component YCBCR1, Component YCBCR2, S-

video and Composite video) will be processed by the video decoder (SAA7118),

then processed by the de-interlace processor (FLI-2310).

If YCBCR signals (480i, 576i) is selected at Component 1 or Component 2 inputs,

the input signals will go to video decoder automatically.

The S-Video and Composite video inputs can accept NTSC, PAL, SECAM signals.

4. Both graphic and video port signals will be processed by the scalar (Oplus RM-

103). The scalar will convert input signals into RGB 8:8:8, 24-bit signals by

downscaling or up-scaling.

4.1.1.2. Graphic Port Input circuit

Mux is high bandwidth multiplexers (AD8183). The Mux select YPBPR1 or

YPBPR2 by controlling HDTV_CTRL signal. The output of Mux will go to

AD9883A.

A/D-decoder (AD9883A) is used for decoding RGB or YPBPR analog signals to

digital signals (RGB 8:8:8) which provide 24 bit true color resolution.

A Schmitt NAND gate (74AHCT132) is used to accept TTL Hsync and Vsync

signals. This projector can support separated (H/V) and composite (H+V) sync

signals. It doesn't support SOG signal.

HDMI Receiver (SII9993) can support HDMI signals. It supports HDTV signals up

to 720p/1080i resolutions.

The EDID EEPROM is used to store the EDID data, included PC and Video

timings. The PC and HDCP video player will read the EEPROM data via EDID

link in the DVI-I connector.