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EN 92
9.
LC4.8E AA
9. Circuit Descriptions, Abbreviation List, and IC Data Sheets
Index of this chapter:
9.1 Introduction
9.2 Block Diagram
9.3 Input/Output
9.4 Tuner and IF
9.5 Video: TV Part (Diagrams B1, B2, and B3)
9.6 Columbus
9.7 Video: Scaler Part (Diagram B7, B8 and B9)
9.8 Audio Processing
9.9 Control
9.10 Abbreviation List
9.11 IC Data Sheets
9.1
Introduction
The LC4.8 LCD TV is a global LCD TV for the year 2005. It is
the successor of the LC4.6 LCD TV and has creen sizes of 37
inch and 42 inch (in 16:9 ratio); it has a new styling, called
Entry+. There are two different picture qualities available,
depending on the model: Pixel Plus and Digital Crystal Clear.
The block diagram below (see Figure "Block diagram") shows
9.2
Block Diagram
TUNER
IF
CVBS
Y
C
SCART/
CINCH
I/O
ComPair
The PLL tuner UV1318 delivers the IF-signal, via audio & video
SAW-filters, to the Video Signal Processor and FLASH
embedded TEXT/Control/Graphics Micro Controller TDA120x1
(item 7011, also called Hercules). This IC has the following
functions:
•
Analogue Video Processing
•
Sound Demodulation
•
Audio Interfaces and switching
•
Volume and tone control for loudspeakers
•
Reflection and delay for loudspeaker channels
•
Micro Controller
•
Data Capture
•
Display
The Hercules has one input for the internal CVBS signal and a
video switch with 3 external CVBS inputs and a CVBS output.
All CVBS inputs can be used as Y-input for Y/C signals.
However, only 2 Y/C sources can be selected because the
circuit has 2 chroma inputs. It is possible to add an additional
CVBS(Y)/C input (CVBS/YX and CX) when the YUV interface
and the RGB/YPRPB input are not needed. Two SCART-
Circuit Descriptions, Abbreviation List, and IC Data Sheets
A/D
CVBS,U,V
AD9945
HERCULES
INTERNAL LIP SYNC CKT
NVM
TO
AUDIO
HP
DMMI
AMP
AUDIO
AMPLIFIER
Figure 9-1 Block Diagram
the Pixel Plus architecture; the architecture of the Digital
Crystal Clear model is shown in the block diagram on the next
page (see Figure "Block diagram of the internal building
blocks").
The architecture consists of a TV and Scaler panel, I/O panel,
Side I/O and Local Keyboard panel and Power Supply panel.
The functions for video/audio processing, microprocessor (µP),
and CC/Teletext (TXT) decoder are all combined in one IC
(TDA150xx, item 7217), the so-called third generation Ultimate
One Chip (UOC-III) or "Hercules". This chip has the following
features:
•
Control, small signal, mono/stereo, and extensive Audio/
Video switching in one IC.
•
Upgrade with digital sound & video processing.
•
Alignment free IF, including SECAM-L/L1 and AM.
•
FM sound 4.5/5.5/6.0/6.5, no traps/bandpass filters.
•
Full multi-standard colour decoder.
•
One Xtal reference for all functions (microprocessor, RCP,
TXT/CC, RDS, colour decoder, and stereo sound
processor).
SDRAM
NVM FLASH DDR
COLUM-
601 INTERF .
601 INTERF .
BUS
SCALER
HDMI
601 INTERFACE
SM5301
HDMI
DVI-I
connectors are used: SCART1 is for RGB-in, video in (CVBS)
and terrestrial out (CVBS), and SCART2 is meant for VCR
(CVBS out and Y/C in). The CVBS-out on pin 19 of SCART2
can be used for monitoring purposes: WYSIWYR (What You
See Is What You Record).
Depending on the model of the TV set, the Hercules delivers its
RGB signals either directly to the Scaler IC or indirectly, via a
Columbus chip (for 2D/3D comb filtering and spatial/temporal
noise reduction, for its description: see further down in this
text). The EPLD, which is present in Pixel Plus models,
provides additional sharpening to the picture. For a general
outline, see the table and the block diagrams below, in which
the architectures of the various models are given, together with
their electronic building blocks.
EPLD
LCD
PANEL
F_15270_007.eps
200505
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