Circuit Descriptions, Abbreviation List, and IC Data Sheets
EN 92
LC4.8A AA
9.
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 screen sizes of 37
inch and 42 inch (in 16:9 ratio); it has a new styling, called
Entry+. Globally, there are three different picture qualities
available, depending on the model: Pixel Plus, Digital Cristal
Clear, and Crystal Clear. The block diagram below (see Figure
“Block diagram”) shows the Pixel Plus architecture; the
architectures of the other models (that are not discussed in this
manual) are 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).
9.2
Block Diagram
Figure 9-1 Block Diagram
The PLL tuner UV1316E/1318SD/TEDE9 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. There are two rear
analogue video inputs: AV is for SVHS in and video (CVBS) in,
and CVI-1 is meant for RGB/YUV in). The rear VIDEO OUT
cinch connector 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 the Pixel Plus models
discussed in this manual, 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.
TUNER
IF
CVBS
CVBS,U,V
A/D
AD9945
COLUM-
BUS
SCALER
LVDSRx
SDRAM
HDMI
NVM FLASH DDR
LCD
PANEL
601 INTERF.
601 INTERF.
D
VI TMDS
601 INTERFACE
Y
C
HERCULES
INTERNAL LIP SYNC CKT
SM5301
DVI-I
HDMI
DMMI
HP
NVM
AUDIO
AMPLIFIER
ComPair
SCART/
CINCH
I/O
TO
AUDIO
AMP
EPLD
LVDSRx
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