Circuit Descriptions, Abbreviation List, and IC Data Sheets
EN 66 LC4.2E AA9.
9. Circuit Descriptions, Abbreviation List, and IC Data Sheets
Index of this chapter
1. Introduction
2. Block Diagram
3. Power Supply
4. Input/Output
5. Tuner and IF
6. Video: TV Part
7. Video: Scaler Part
8. Audio Processing
9. Control
10. LCD Display
11. Abbreviation List
12. IC Data Sheets
9.1 Introduction
The LC4.2 LCD TV is a global LCD TV for the year 2004. It is
the successor of the LC03 LCD TV and covers screens sizes
17, 23 and 26 inch (all in 16:9 ratio) and has a new styling,
called Disc.
This chassis has the following (new) features:
• Audio: The sound processor is part of the UOC processor
(called “Hercules”). The chassis has a FM Radio with 40
preset channels.
• Video: Enhanced video features, video drivers, Active
Control and multiple PIP.
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 (P),
and CC/Teletext (TXT) decoder are all combined in one IC
(TDA120xx, item 7011), 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 color decoder.
• One Xtal reference for all functions (microprocessor, RCP,
TXT/CC, RDS, color decoder, and stereo sound
processor).
9.2 Block Diagram
Figure 9-1 Block Diagram LC4.2
The PLL tuner UR1316 (with FM radio) 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-
connectors are used: SCART1 is fully equipped and SCART2
is meant for VCR. Pin 10 of SCART2 is used for Easylink (P50)
and there is a possibility for Y/C in. The CVBS-out on pin 19
can be used for WYSIWYR (What You See Is What You
Record).
HERCULES
(VDP + STEREO)
TDA9178
CTI/LTI/Hist.
NVM
Tuner
TV/FM
3DYC
uPCxxx
(Option)
LIP
SYNC
GM1501
(SCALER)
NVM
FLASH
SDRAM
LCD
PANEL
HDMI
Processor
Speakers
& HP
DMMI
(Multi-media
Interface)
Hercules-
Compair
(Service)
VGA
INPUT
HM
Link
(RJ12)
PC
Audio
INPUT
Cinch-to-VGA
Adapter
(YPbPr- HD)
MUX
MUX
ANALOGUE TV SCALER
Audio
Amp
Embedded
Flash
I
2
S
YUV
Interface
Analogue
Input
24-bit
Input
DVI
Input
DVI-to-HDMI
Adapter
I
2
C
RGBHV/
YPbPr
RGB
& HV
Power Supply Unit
AC Mains
Input
HDMI
INPUT
DVI-D
INPUT
Option: Choose one
AV1 AV2 Side
Const
Audio
Out
TV/IOs
(SCART/Cinch)
Compair
(UART)
DMMI
LVDS
E_14490_058.eps
060804
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