Philips LC4.5E, Service Manual, Page: 70 / 80

Circuit Descriptions, Abbreviation List, and IC Data Sheets EN 70 LC4.5E AA 9.
9.10 Abbreviation List
0/6/12 SCART switch control signal on A/V
board. 0 = loop through (AUX to TV), 6
= play 16:9 format, 12 = play 4:3
format
1080i 1080 visible lines, interlaced
1080p 1080 visible lines, progressive scan
2CS 2 Carrier Sound (or 2 Channel Stereo)
480i 480 visible lines, interlaced
480p 480 visible lines, progressive scan
ACI Automatic Channel Installation:
algorithm that installs TV channels
directly from a cable network by
means of a predefined TXT page
ADC Analogue to Digital Converter
AFC Automatic Frequency Control; Control
signal used to tune and lock to the
correct frequency
AGC Automatic gain control (feedback)
signal to the tuner. This circuit ensures
a constant output amplitude
regardless of the input amplitude
AM Amplitude Modulation; A "data
encoding to a carrier" method, such
that the carrier amplitude is
proportional to the data value
AP or A/P Asia Pacific
AR Aspect Ratio: 4 by 3 or 16 by 9
ASD Automatic Standard Detection
AUO Acer Unipack Optical (supplier)
AV External Audio Video
B-SC1-IN Blue EXT1/SCART1 in
B-SC2-IN Blue EXT2/SCART2 in
B-TXT Blue TeleteXT
B/G Monochrome TV system. Sound
carrier distance is 5.5 MHz B= VHF-
band, G= UHF-band
BOCMA Bimos one Chip Mid-end Architecture:
video and chroma decoder
C-FRONT Chrominance front input
CBA Circuit Board Assembly (also named
PCB or PWB)
CL Constant Level: audio output to
connect with an external amplifier
CLUT Colour Look Up Table
ComPair Computer aided rePair. A tool for
diagnosing a TV through a PC
controlled interface
CSM Customer Service Mode
CVBS Composite Video and Blanking Signal;
A single video signal that contains
luminance, colour, and timing
information
CVBS-EXT CVBS signal from external source
(VCR, VCD, etc.)
CVBS-INT CVBS signal from internal Tuner
CVBS-MON CVBS monitor signal
CVBS-TER-OUT CVBS TERrestrial OUTput signal
DAC Digital to Analogue Converter
DBE Dynamic Bass Enhancement: extra
low frequency amplification
DFU Directions For Use: owner's manual
DNR Dynamic Noise Reduction
DRAM Dynamic RAM; dynamically refreshed
RAM
DSP Digital Signal Processing
DST Dealer Service Tool; Special remote
control designed for dealers to enter
e.g. service mode (a DST-emulator is
available in ComPair)
DTS Digital Theatre System; A multi-
channel surround sound format,
similar to Dolby Digital
DVD Digital Versatile Disc
EEPROM Electrically Erasable and
Programmable Read Only Memory
EPG Electronic Program Guide: system
used by broadcasters to transmit TV
guide information (= NexTView)
EU EUrope
EXT EXTernal (source), entering the set by
SCART or by cinches (jacks)
FBL Fast BLanking; DC signal
accompanying RGB signals. To blank
the video signal when it is returning
from the right side of the screen to the
left side. The video level is brought
down below the black video level
FBL-SC1-IN Fast blanking signal for SCART1 in
FBL-SC2-IN Fast blanking signal for SCART2 in
FBL-TXT Fast Blanking Teletext
FLASH FLASH memory
FM Field Memory: A memory chip that is
capable of storing one or more TV
picture fields / Frequency Modulation:
A technique that sends data as
frequency variations of a carrier signal
FMR FM Radio: Radio receiver that can
receive the FM Band 87.5 - 108 MHz
FRC Frame Rate Converter
FRONT-C Front input chrominance (SVHS)
FRONT-DETECT Control line for detection of
headphone insertion, Service Mode
jumper, power failure detection
FRONT-Y_CVBS Front input luminance or CVBS
(SVHS)
G-SC1-IN Green SCART1/EXT1 in
G-SC2-IN Green SCART2/EXT2 in
G-TXT Green teletext
H H_sync to the module
HA Horizontal Acquisition: horizontal sync
pulse coming out of the BOCMA
HD High Definition
HP Head Phone
I Monochrome TV system. Sound
carrier distance is 6.0 MHz; VHF- and
UHF-band
I
2
C Inter IC bus (also called IIC)
I
2
S Inter IC Sound bus
IC Integrated Circuit
IF Intermediate Frequency
Interlaced Scan mode where two fields are used
to form one frame. Each field contains
half the number of the total amount of
lines. The fields are written in "pairs",
causing line flicker.
IR Infra Red
IRQ Interrupt ReQuest
Last Status The settings last chosen by the
customer and read and stored in RAM
or in the NVM. They are called at start-
up of the set to configure it according
the customer’s preferences
LATAM LATin AMerica
LC04 Philips chassis name for LCD TV 2004
project
LCD Liquid Crystal Display
LED Light Emitting Diode; A semiconductor
diode that emits light when a current is
passed through it
LINE-DRIVE Horizontal (line) deflection drive signal
(for the Line transistor)
L/L' Monochrome TV system. Sound
carrier distance is 6.5 MHz. L' is Band
I, L is all bands except for Band I
LS Loud Speaker