Circuit Descriptions - Philips LC4.1U AA Service Manual

Circuit Descriptions, Abbreviation List, and IC Data Sheets
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 LC4.1 LCD TV is a global LCD TV for the year 2004. It is
the successor of the LC13 LCD TV and covers screens sizes
14, 15, 17, 20 and 23 inch (in both 4:3 and 16:9 ratio) with SP2
and ARCH3 styling.
This chassis has the following (new) features:
9.2
Block Diagram
Main
Board
Tuner
TV/FM
IIC
AV1
Compair
(Scart or
(Service)
Cinch)
Audio amplifier(2x5w)
board for 20,23 inch
AUD_SUP AUDIO CONTROL
SINGALS
(Standby, Mute,)
AC Mains Input
NVM
RGB Output
HERCULES
(VDP+STEREO)
Embedded
555
Flash
trigger
H/V
circuits
Sync
Audio
Amplifier(2x2
w)
Speakers
and HP
Side AV Audio Output CVBS/YC Input
Panel and HP output
Figure 9-1 Block Diagram LC4.1
•
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 and Active
Control.
The architecture consists of a TV and Scaler panel with I/O,
Side I/O panel, Sound Amplifier Panel, Top Control 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).
Power Supply
Low Pass
Video Filter
Filter
(SM5301BS-
Video Buffer
Jump
Schmitt
Switch Triggers
(74HC4053D)
SD_PCHD_SEL
PC
detect
circuit
RGB or YPbPr
H/V Sync
VGA INPUT
Cinch_to_VGA
Adaptor
(YPbPr)
PC Audio Input UART (Optional)
LC4.1U AA
SOG, R_PR+, R_PR-,
G_Y+, G_Y-, B_PB+,
B_PB- signal producing
circuits
with LSI
G) FLASH
NVM
Memory
PC_HD_SEL
Pin181,182
GM5221
Pin85
Pin 111
(PC_DET)
GND( Industrial
mode)
+3V3STBY( normal
operation)
VGA_5V
Compair
(UART)
9. EN 45
LCD
Panel
LVDS/TTL
E_14520_046.eps
160904