Hitachi 55293DLB, Service Manual

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1. INTRODUCTION
17MB100 main board is driven by MStar SOC. This IC is a single chip iDTV solution that supports channel
decoding, MPEG decoding, and media-center functionality enabled by a high performance AV CODEC and
CPU. This IC also supports 4K2K (UHD).
Key features includes,

Combo Front-End Demodulator

A multi standart A/V format decoder

The MACEpro video processor

Home theatre sound processor

Internet and Variety of Connectivity Support

Dual-stream decoder for 3D contents

M ı lti-purpose CPU for OS and multimedia

Peripheral and power management
Supported peripherals are:

1 RF input VHF I, VHF III, UHF

1 Satellite input

1 Side AV (CVBS, R/L_Audio)

1 Side SCART socket(Common)

1 YPbPr (Common)

1 Side S-Video(Common)

1 PC input(Common)

4 HDMI input(Common)

1 Common interface(Common)

1 Optic S/PDIF output(Common)

1 Stereo audio input for PC(Common)

1 Subwoofer output(Common)

1 Headphone(Common)

2x USB3.0 and 1xUSB2.0(Common)

1 Ethernet-RJ45 (Common)

1 External Touchpad(Common)

Internal Wi-Fi and BT
2. TUNER
A. SI2157 TERRESTRIAL AND CABLE TV TUNER
Description
The Si2157 is Silicon Labs' fifth-generation hybrid TV tuner supporting all worldwide terrestrial and cable TV
standards. Requiring no external balun, SAW filters, wirewound inductors or LNAs, the Si2157 offers the
lowest-cost BOM for a hybrid TV tuner. Also included are an integrated power-on reset circuit and an option
for single power supply operation. As with prior-generation Silicon Labs TV tuners, the Si2157 maintains very
high linearity and low noise to deliver superior picture quality and a higher number of received stations when
compared to other silicon tuners and discrete MOPLL-based tuners. The Si2157 also incorporates a harmonic-
rejection mixer to deliver excellent Wi-Fi and LTE immunity. For the best performance with next-generation
digital TV standards such as DVB-T2/C2, the Si2157 delivers industry-leading phase noise performance.