Specifications
Circuit Descriptions, List of Abbreviations, and IC Data Sheets
EN 74 L04.6HU CA9.
9. Circuit Descriptions, List of Abbreviations, and IC Data Sheets
Index of this chapter:
9.1 Introduction
9.2 ATSC Module
9.3 Supply Architecture
9.4 Power Modes
9.5 Abbreviation List
9.6 IC Data Sheets
Notes:
•Only new circuits compared to the L04 chassis are
described in this chapter. For the other circuit descriptions,
see the L04 manual.
• Figures can deviate slightly from the actual situation, due
to different set executions.
• For a good understanding of the following circuit
descriptions, please use the diagrams in sections “Block
Diagrams, ...”, and/or “Electrical Diagrams”. Where
necessary, you will find a separate drawing for clarification.
9.1 Introduction
Figure 9-1 Chassis block diagram
The “L04.6 ATSC” platform is derived from the L04 chassis. It
is designed to be a Standard Definition (SD) 60 Hz set for the
NAFTA market segments. Screen sizes of standard TV models
are 27- and 32-inch, but the iTV/Hotel TV version (L04.6HU
CA) uses 27 inch screens only.
The "L04" chassis, developed by Philips Singapore BCT MTV,
was a global “50/60Hz” chassis for the BASIC and BASIC+
market segment.
The fundamental electrical properties and key components of
L04.6 ATSC are:
• Hercules = TDA12000 with integrated Video processing,
Sound processing and Microprocessor.
• Audio Amplifier = TDA2616Q with the capability to drive up
to 2X10W stereo sets.
• Zoran ZR39640: ATSC decoder + Scalar.
• The L04.6HU CA (iTV/Hotel TV), contains some additional
modules: the EPS1B (power supply for extra functions), the
SP/LS (Smart Plug and bathroom speaker), and an
Interface module (not used in standard models).
The standard architecture consists of a Main panel (called
"family board"), a Picture Tube panel, a Side I/O panel, a Top
Control panel, and an ATSC panel. The Main panel carries the
small and large signals on the same board, and uses primarily
conventional components, with some surface mounted devices
in the audio and video processing part.
The ATSC digital module is a TV bolt on module with a
terrestrial RF Digital ATSC 8VSB (Free to Air) front end and
Cable RF Digital ATSC, QAM (Cable in-the-clear) front end.
For Service, this is a black box. When defective, this module
must be replaced, and the defective module must be send to
the centralized repair workshop.
The functions for video/audio processing, microprocessor (uP),
and CC/Teletext (TXT) decoding are all combined in one IC
(TDA120xxH, item 7200), the so-called third generation
Ultimate One Chip (UOC-III) or “Hercules”. This chip is
mounted on the “solder” side of the main panel, and 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.
• 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).
The tuning system features 181 channels with on-screen
display. The main tuning system uses a tuner, a
microcomputer, and a memory IC mounted on the main panel.
The microcomputer communicates with the memory IC, the
customer keyboard, remote receiver, tuner, signal processor IC
and the audio output IC via the I2C bus. The memory IC retains
HERCULES
TV_IRQ
I retsaMI1suB C
NVM
TUNER
MVN
PW
ATSC
panel
IR
L
i
g
h
t
S
e
n
s
o
r
SCART_
2 Status
SEL_LL/
H_Reset
INT2
3
SCL
21
16
P2.2
13
ADC1
10
ADC2
14
ADC0
P2.1
17
eRes+_
t
V5
24
P0.1
Sound
Amp
18
P2.0
INT0
32
22
P1.3
SDA
20
ADC3
9
Power_Down
INT1
31
P1.5/TX
1
V
o
l
_
m
u
t
e
P2.5
6
Key Board
B
,
C
A
P2.4
7
15
P2.3
SCART_1
Status
P1.4/TX
2
O
RT_C
o
il
S
t
d
b
y
_
C
o
n
UART COMM
F_15760_040.eps
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