Sharp Aquos LC-42D72U, Service Manual

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LC-42D72U
5 – 2
1.11. IC8101 (RH-iXB281WJZZQ)
This LSI with MPEG-2 system decoder performs back-end processing for digital broadcasting. It is equipped with a CPU (processor core: AM33-3),
de scrambler (DES), transport stream de-multiplexer, video decoder (MPEG-2 MP@HL compatible), graphic processor, audio decoder (AC3 compat-
ible), and an NTSC video encoder.
After receiving transport stream from the tuner, the LSI decrypts pay-TV broadcasts with the de scrambler. Then using the de-multiplexer, it separates
and decodes the compressed audio and video data to send the signals. In the visual system, the graphic processor makes it possible to overlap sub-
titles and perform scaling. Digital video signals (Y, Pb and Pr, or 480I/P, 720P and 1081I) and down-converted NTSC signals (Y/C and composite, or
480I) can be sent simultaneously. As for the audio system, decoded AC3 audio can be overlapped with sound effects.
The LSI also contains various interfaces (I2C x 2, UART x 3, an SD Memory Card interface, a Cable CARD interface, etc.) and a GPIO. Using these
interfaces, the CPU controls peripheral circuits of the tuner, SD Memory Cards, Cable CARDs, etc. One of the UARTs is used by the CPU to establish
communications with the monitor microcomputer in the unit, where remote control information or other data is exchanged. Another UART is used for
RS-232C serial communications to connect the unit to a PC.
1.12. IC8301/8302/8303/8304 (RH-iXB765WJQZQ)
These are 256-Mb (4 Mb x 16 I/O x 4 banks) F-die DDR SDRAMs.
1.13. IC8451 (RH-iXB963WJQZQ)
The 64-Mbit page mode flash memory device stores the main CPU program.
1.14. IC8601 (RH-iXB684WJQZQ)
The RH-IXB684WJQZQ comprises a family of advanced QAM and VSB demodulator for the Digital Cable Ready and ATSC environments.
This IC is configurable to operate in either the ITU-J.83B/SCTE DVS-031 compliant 64 QAM or 256 QAM modes used by digital cable systems, or the
ATSC compliant 8VSB mode used in digital terrestrial broadcasting.
For digitally modulated input signals (QAM or 8VSB), the RH-IXB684WJQZQ outputs a parallel or serial MPEG compliant transport stream.
1.15. IC8702 (VHiTC6384AF1EQ)
This is a Standard Memory Interface to SD Memory Controller.
1.16. IC9101 (RH-iXB732WJQZQ)
The high-performance CPLD (Complex Programmable Logic Device) is controlled by the main CPU to send control signals to various mounted
devices.
1.17. IC2007 (VHiACH1G08W-1Y)
IC2007 manufactured by TI has been used for the initial lots. However, since it was discontinued, it is changed to one manufactured by PHILIPS
(VHiAHC1G08W-1Y) from the 4th lot.