Circuit Descriptions - Philips LC4.2E Service Manual

EN 66 9. LC4.2E AA
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:
9.2
Block Diagram
ANALOGUE TV
Tuner
TV/FM
3DYC
uPCxxx
(Option)
2
I C
Hercules-
HM
Compair
Link
(Service)
(RJ12)
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
Circuit Descriptions, Abbreviation List, and IC Data Sheets
AC Mains
Input
Power Supply Unit
TDA9178
CTI/LTI/Hist.
NVM
YUV
Interface
HERCULES
RGB
(VDP + STEREO)
& HV
Embedded
Flash
2
I S
LIP Audio
SYNC Amp
Side Const
AV1 AV2
Speakers
Audio
& HP
Out
TV/IOs
(SCART/Cinch)
Figure 9-1 Block Diagram LC4.2
•
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).
DMMI
DMMI
(Multi-media
NVM
Interface)
Analogue
MUX
Input
MUX
RGBHV/
YPbPr
PC
VGA
Audio
INPUT
INPUT
Cinch-to-VGA
Adapter
(YPbPr- HD)
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).
SCALER
SDRAM
FLASH
GM1501
LVDS
(SCALER)
DVI 24-bit
Input Input
HDMI
Processor
HDMI Compair
DVI-D
INPUT (UART)
INPUT
Option: Choose one
DVI-to-HDMI
Adapter
E_14490_058.eps
LCD
PANEL
060804